FLUORORESIN DIAPHRAGM VALVE

Abstract

A fluororesin diaphragm valve includes a valve portion, a sealing mechanism and an adjusting mechanism for the opening degree of the valve. The valve portion includes a valve body, a valve shaft, and a valve upper cover. The valve body includes a square portion, an annular portion, and a valve chamber. The sealing mechanism includes a diaphragm, an upper valve body, a tightening ring and an annular portion of the valve body. The adjusting mechanism is installed on the top of the valve upper cover. The sealing mechanism is installed in the annular portion and at the minimum diameter area of the annular portion, having annular lattice-shaped ribbed plates with horizontal openings to increase the structural strength of the diaphragm seal and improve the heat dissipation effect.

Claims

1. A sealing mechanism of a fluororesin diaphragm valve, used for liquid transportation at 200° C. without forced cooling of an external gas and for liquid transportation at 230° C. with forced cooling of the external gas, the sealing mechanism of the fluororesin diaphragm valve comprising related parts and mechanisms of a valve portion; the valve portion including a valve body, a force-applying member, a valve upper cover, a diaphragm, and a valve shaft; the valve body including an inlet, an outlet, a valve chamber, an annular portion, and a square portion; the valve shaft being a hollow shaft, including a fixing end, a shaft rod, and a plurality of gas guide holes; the annular portion being a cup-shaped structure having an opening, a bottom of the annular portion being defined as the valve chamber, the annular portion including a sealing surface, an external ring surface, a minimum diameter area, one or more cooling gas holes, a cooling gas annular groove and an internal ring surface, the opening being closed by the valve upper cover; the valve upper cover including an inner accommodating chamber, an external ring surface, a top, and a central hole; the diaphragm including a peripheral portion, an elastic portion, and a central portion: one end of the valve shaft having a fixing end capable of locking the central portion of the diaphragm; characterized in that: the valve portion further includes a tightening ring; the annular portion further includes a ribbed plate structure; the sealing mechanism includes the annular portion, the ribbed plate structure, the diaphragm, the tightening ring, and the force-applying member; the force-applying member has a tightening surface, and the tightening surface is a structural surface, the annular portion has the sealing surface, the sealing surface is a structural surface; the tightening surface connects the annular portion to the sealing surface to form a C-shaped structure; a tightening portion of the C-shaped structure includes the force-applying member, and the force-applying member is tightly locked to the annular portion; a support arm of the C-shaped structure provides overall structural strength for the annular portion and the ribbed plate structure; a base of the C-shaped structure is the sealing surface, which is supported by the minimum diameter area, a flow channel side wall of the valve chamber and the ribbed plate structure; the tightening surface is moved downward by locking tightly, so that the tightening ring and the diaphragm are clamped by the tightening surface and the sealing surface to prevent leakage; the tightening ring is an annular structure with an approximately rectangular cross-section, and has two ends defined as a force-receiving end and a tightening end, and has a plurality of cooling gas holes; the tightening end is an obtuse angle β, 110°≤β≤150°; when the diaphragm is installed in the valve chamber, the peripheral portion is attached to the sealing surface; the tightening ring is installed in the tightening groove of the force-applying member; the tightening surface applies a force F to the force-receiving end, so that the tightening end having the obtuse angle β is tightened on the peripheral portion; when the sealing surface is applied with the force F, it is supported by the ribbed plate structure of the annular portion, and is supported by the square portion and the flow channel side wall of the valve chamber; the tightening force F has a force-applying angle ε with a normal line N of a force-applying surface of the peripheral portion, and the force-applying angle ε is in the range 0°<ε≤15°.

2. The sealing mechanism of the fluororesin diaphragm valve as claimed in claim 1, wherein the ribbed plate structure is located on the external ring surface of the annular portion, and is an annular latticed structure with a plurality of horizontal openings; the ribbed plate structure is axially connected to the square portion, and its axial position contains the structure of the minimum diameter area, the tightening ring and the tightening surface; the ribbed plate structure is composed of one or more annular ribbed plates and a plurality of vertical ribbed plates, and the plurality of vertical ribbed plates are axially connected to all the annular ribbed plates through the square portion.

3. The sealing mechanism of the fluororesin diaphragm valve as claimed in claim 1, wherein the force-applying member is an upper valve body, the upper valve body includes a locking screw thread, a shaft hole, one or more annular grooves, a plurality of groove ribbed plates, a diaphragm chamber, and a tightening groove; the tightening groove has a tightening surface; the internal ring surface of the annular portion is provided with an internal screw thread, the locking screw thread is tightly engaged with the internal screw thread; the upper valve body is tightly locked to the internal screw thread, the tightening ring is installed in the tightening groove; and an axial distribution position of the ribbed plate structure contains the minimum diameter area and a plurality of screw threads of the external screw thread.

4. The sealing mechanism of the fluororesin diaphragm valve as claimed in claim 3, wherein the external ring surface of the annular portion is provided with an external screw thread, and a plurality of screw threads of the internal screw thread and the external screw thread are overlapped in the axial position, the ribbed plate structure connects the external screw thread, the valve upper cover is provided with an internal screw thread for tightly locking and engaging with the external screw thread of the annular portion; the axial position of the internal screw thread of the annular portion is contained by the axial length of the external screw thread and the ribbed plate structure; when the valve upper cover is tightly locked to the external screw thread, a plurality of screw threads distributed in the axial direction of the internal screw thread of the valve upper cover and the locking screw thread of the upper valve body are overlapped.

5. The sealing mechanism of the fluororesin diaphragm valve as claimed in claim 3, wherein the external ring surface of the annular portion is provided with a plurality of spaced annular ribbed plates, and the axial position of the ribbed plate structure contains the internal screw thread of the annular portion.

6. The sealing mechanism of the fluororesin diaphragm valve as claimed in claim 1, wherein the external ring surface of the valve upper cover is provided with a plurality of spaced annular ribbed plates.

7. The sealing mechanism of the fluororesin diaphragm valve as claimed in claim 1, wherein the external ring surface of the valve upper cover is provided with the ribbed plate structure.

8. The sealing mechanism of the fluororesin diaphragm valve as claimed in claim 3, wherein an O-ring groove is provided on an exterior ring side of the force-receiving end.

9. The sealing mechanism of the fluororesin diaphragm valve as claimed in claim 3, wherein the valve shaft passes through the shaft hole of the upper valve body, the tightening ring is installed in the tightening groove, the diaphragm is installed on the fixing end of the valve shaft, and the diaphragm is rotatable relative to the valve shaft.

10. The sealing mechanism of the fluororesin diaphragm valve as claimed in claim 1, wherein the exterior ring surface of the annular portion is provided with an external screw thread, the valve upper cover includes an inner accommodating chamber, an external ring surface, an internal screw thread, a top, a shaft hub portion, a central hole, and a sealing ribbed plate; the force-applying member is the sealing ribbed plate of the valve upper cover; the sealing ribbed plate is located between the shaft hub portion and the internal screw thread, a threaded groove is formed between the annular sealing ribbed plate and the internal screw thread, a shaft hub groove is formed between the shaft hub portion and the annular sealing ribbed plate; a lower end of the annular sealing ribbed plate is formed with an annular tightening groove, an opening of the groove faces the internal screw thread and faces downward, the tightening surface is provided at an upper bottom of the tightening groove; the tightening ring is installed in the annular tightening groove; a plurality of radial ribs are connected between the shaft hub portion and the annular sealing ribbed plate to provide higher rigidity of the sealing ribbed plate and to isolate heat transferred from the valve shaft; when the valve upper cover is tightly closed by the annular portion, the structure of the annular portion is embedded in the threaded groove, the exterior ring surface of the sealing ribbed plate is provided with a plurality of convex longitudinal ribs, and the plurality of convex longitudinal ribs are adjacent to the internal ring surface of the annular portion to provide structural rigidity and to isolate heat transferred from the peripheral portion of the diaphragm.

11. The sealing mechanism of the fluororesin diaphragm valve as claimed in claim 1, wherein the peripheral portion has a wedge-shaped cross-section, with a greater thickness on its outer side and a less thickness on its inner side connected to the elastic portion, the peripheral portion includes upper and lower side surfaces, the upper side surface is defined as a force-receiving surface, the lower side surface is defined as a fitting surface, the fitting surface and the force-receiving surface are mutually non-planar surfaces or conical surfaces, the fitting surface is attached to the sealing surface, the force-receiving surface is pressed tightly by the tightening end of the tightening ring.

12. The sealing mechanism of the fluororesin diaphragm valve as claimed in claim 1, wherein the sealing surface is a conical surface or a planar surface.

13. A fluororesin diaphragm manual valve structure, comprising an adjusting mechanism configured to manually adjust an opening degree of the valve, the adjusting mechanism being installed on a valve upper cover, the valve upper cover having a central hole and one or more positioning holes, characterized in that: the adjusting mechanism includes a valve shaft, an adjusting seat, a C-shaped retaining ring, an adjusting wheel, a displacement indicator, a positioning nut assembly, and a locking nut assembly; the valve shaft is a hollow shaft and includes a fixing end, a shaft rod, a plurality of gas guide holes, a slide portion, an adjusting screw thread, and a locking screw thread; the slide portion is an axle having a pair of parallel cut-out sides; the adjusting seat includes a shoulder, a neck, an internal space, an external ring groove, a tool opening, and a positioning post; the positioning post is coupled to the positioning hole to keep the valve shaft concentric; the C-shaped retaining ring has an external ring surface, an inner diameter hole, an opening portion, two tool holes, a width B, and a thickness T; each of the positioning nut assembly and the locking nut assembly is composed of two nuts; the adjusting wheel includes a top, an external ring surface, an internal ring surface, an internal ring groove, a hub, an adjusting threaded hole, and a tool opening; the displacement indicator in the form of a gate-shaped strip includes a displacement space, a displacement scale, two fixing holes, and a central hole; the C-shaped retaining ring is completely opened in the internal ring groove and the external ring groove: the internal ring groove and the external ring groove have a same groove width W, and are slidably fitted with the thickness T of the C-shaped retaining ring; the adjusting wheel is rotated smoothly relative to the adjusting seat, the slide hole is coupled with the slide portion of the valve shaft, and the adjusting screw thread of the valve shaft is coupled with the adjusting threaded hole of the adjusting wheel.

14. The fluororesin diaphragm manual valve structure as claimed in claim 13, wherein the C-shaped retaining ring is tightened by a tool passing through the tool opening and the two tool holes, and then the adjusting wheel is installed on the adjusting seat, the inner diameter of the C-shaped retaining ring is less than the outer diameter of the external ring groove, and the outer diameter of the C-shaped retaining ring is less than the inner diameter of the internal ring groove.

15. The fluororesin diaphragm manual valve structure as claimed in claim 13, wherein the groove width is W-0.0 mm>=T>=W-0.1 mm, when the valve shaft is subjected to a pressure wave, the force of the pressure wave is directly transmitted to the adjusting wheel and transmitted to the valve body structure through the C-shaped retaining ring.

16. The fluororesin diaphragm manual valve structure as claimed in claim 13, wherein, the displacement indicator is installed on the top of the adjusting wheel, the valve shaft passes through the central hole of the displacement indicator, the locking nut assembly is installed, the valve shaft is tightly locked on the displacement indicator with the lock nut assembly; the positioning nut assembly is installed on the locking screw thread, when the valve is closed, the lower nut of the positioning nut assembly is attached to the top of the adjusting wheel, and the positioning nut assembly is fixed on the valve shaft by locking the upper nut tightly; a middle line of two nuts of the positioning nut assembly serves as a reference of position indication, corresponding to a zero point of the displacement scale; when the opening degree of the valve needs to be adjusted again, the locking nut assembly are loosened and then adjusted to a desired position with the adjusting wheel, and the locking nut assembly is locked again.

17. The fluororesin diaphragm manual valve structure as claimed in claim 13, wherein the adjusting seat is integrated with the valve upper cover.

18. The fluororesin diaphragm manual valve structure as claimed in claim 13, wherein the valve shaft is a hollow shaft and includes a fixing end, a shaft rod, a plurality of gas guide holes, an adjusting screw thread, a locking screw thread, and a piston; the adjusting seat includes a shoulder, a neck, an internal space, an external ring groove, a tool opening, and a positioning post; when the piston is coupled with an upper valve body, the upper valve body provides an anti-rotation function for the valve shaft.

19. The fluororesin diaphragm manual valve structure as claimed in claim 18, wherein the valve shaft is a hollow shaft and includes a fixing end, a shaft rod, a plurality of gas guide holes, an adjusting screw thread, a locking screw thread, a piston and a slide portion; the adjusting seat includes a shoulder, a neck, an internal space, an external ring groove, a tool opening, a positioning post, a locating seat, and a locating screw thread; the adjusting seat is used for installing a locating ring, a locating screw sleeve is used to lock the locating ring, the locating ring includes a flange, an external ring surface, and an internal elongate hole; the locating screw sleeve includes an external screw thread, a central hole, and a twisting portion, the internal elongate hole is coupled with the slide portion of the valve shaft, and the anti-rotation function of the valve shaft is provided by the locating ring.

20. A fluororesin diaphragm manual valve structure, having a protection device configured to prevent a wrong operation and a valve shaft connected with an adjusting device and a displacement indicator, an opening degree of the manual valve is adjustable through the valve shaft and the adjusting device, the valve shaft being provided with a locking screw thread, and including a positioning nut assembly and a locking nut assembly, the protection device being configured to ensure that there will be no wrong operation, characterized in that: the protection device includes the displacement indicator and a safety cover; the displacement indicator in the form of a gate-shaped strip includes a displacement space, a position scale, two fixing holes, a central hole, a safety seat, a locking rib, and a locking hole; after the adjusting device completes the adjustment of the opening degree of the valve, the positioning nut assembly is locked to the valve shaft, the locking nut assembly is tightly locked to the displacement indicator; the safety cover includes an inner accommodating chamber, a fixing side, a locking rib, and a locking hole; the fixing side of the safety cover is installed to the safety seat of the displacement indicator, the locking rib of the safety cover is matched with the locking rib of the displacement indicator, the two locking holes communicates with each other and are locked by a lock; the accommodating chamber of the safety cover is configured to accommodate the displacement indicator and the valve shaft.

21. The fluororesin diaphragm manual valve structure as claimed in claim 20, wherein a displacement indicator is installed on the top of the valve upper cover of a normally closed pneumatic valve, a positioning column is installed on a bottom of the displacement indicator to be coupled with the positioning hole of the valve upper cover, the displacement indicator further includes a limit bolt, the locking nut assembly, and the safety cover; the limit bolt is first installed with the locking nut assembly and passes through the central hole of the displacement indicator, the locking nut assembly is installed from a tail end of the limit bolt until the tail end of the limit bolt reaches a required height, at this time, the limit bolt is tightly locked with the locking nut assembly, when a high-pressure gas is introduced into the driving cylinder, a tail end of the valve shaft is blocked by the limit bolt; the safety cover is configured to protect the displacement indicator.

22. A fluororesin diaphragm pneumatic valve structure, which is a pneumatic valve having a heat dissipation enhancing structure, used for liquid transportation at 200° C. without forced cooling of an external gas and for liquid transportation at 230° C. with forced cooling of the external gas, the pneumatic valve including a driving cylinder, a valve portion and a sealing mechanism, the driving cylinder and the valve portion being respectively provided with four bolt posts, four metal bolts being used for airtightness; the driving cylinder including an upper valve body, a valve upper cover, a valve shaft, a cylinder space, and a partial structure of the valve portion; the valve shaft being a hollow shaft and including a fixing end, a shaft rod, a plurality of gas guide holes, and a piston; the cylinder space being an airtight space from the valve upper cover to the upper valve body, the piston dividing the cylinder space into a gas space and a spring space; the valve portion including a valve body, the upper valve body, a diaphragm, and the valve shaft; the valve body including an inlet, an outlet, a valve chamber, an annular portion, and a square portion; the diaphragm including a peripheral portion, an elastic portion, and a central portion; the annular portion being a cup-shaped structure having an opening, a bottom of the annular portion being defined as the valve chamber, the annular portion including a sealing surface, an external ring surface, a minimum diameter area, an internal screw thread, one or more cooling gas holes, a cooling gas annular groove, a joint surface, an internal ring surface, and the four bolt posts; the diaphragm including a peripheral portion, an elastic portion, and a central portion; the cylinder chamber being defined inside the valve upper cover; characterized in that: the valve portion further includes a tightening ring; the annular portion further includes a ribbed plate structure and two gas posts; the sealing mechanism includes the annular portion, the ribbed plate structure, the diaphragm, the tightening ring, and the upper valve body; the valve upper cover including an inner accommodating chamber, an internal ring surface, an external ring surface, a top, a central hole, a plurality of annular ribbed plates, the four bolt posts, and two gas posts; the annular ribbed plates are spaced and distributed on the external ring surface of the valve upper cover; the upper valve body includes a locking screw thread, a tightening groove, a shaft hole, one or more annular grooves, a plurality of groove ribbed plates, a diaphragm chamber, and a tightening surface; the peripheral portion includes upper and lower side surfaces, the upper side surface is defined as a force-receiving surface, the lower side surface is defined as a fitting surface, the fitting surface and the force-receiving surface are mutually non-planar surfaces or conical surfaces, the fitting surface is attached to the sealing surface, the force-receiving surface is pressed tightly by the tightening end of the tightening ring; the tightening ring has an approximately rectangular cross-section and has two ends defined as a force-receiving end and a tightening end; the force-receiving end of the tightening ring bears the pressure of the tightening surface, the tightening end of the tightening ring presses the annular portion of the diaphragm against the sealing surface, forming a force-applying angle ε and a tightening force F, the force-applying angle is the included angle of the normal line N of the annular portion, the force-applying angle ε is in the range 0°<ε≤15°, the tightening end is an obtuse angle β, 110°≤β≤150°.

23. The fluororesin diaphragm pneumatic valve structure as claimed in claim 22, wherein the ribbed plate structure is disposed on the external ring surface of the annular portion and is composed of one or more annular ribbed plates and a plurality of vertical ribbed plates, the plurality of vertical ribbed plates are axially connected to all the annular ribbed plates through the square portion, an axial distribution position of the ribbed plate structure contains the minimum diameter area and the external ring surface and also contains an axial length of the inner screw thread.

24. The fluororesin diaphragm pneumatic valve structure as claimed in claim 22, wherein the annular ribbed plate and the sealing mechanism are configured to increase the structural strength and heat dissipation effect of the cylinder space; four corners of the annular ribbed plates and the annular portion have the bolt posts respectively, and are installed above the minimum diameter area of the annular portion and spaced apart from and located above the square portion.

25. The fluororesin diaphragm pneumatic valve structure as claimed in claim 22, wherein one of the two gas posts of the valve upper cover and the two gas posts of the annular portion is configured to introduce a high-pressure gas to the gas space and the other is configured to introduce the cooling gas, the gas posts that introduce the cooling gas have a cooling gas annular groove connected to the annular portion, the gas posts are provided with cooling gas holes to communicate with an external forced cooling gas; the gas posts are all installed above the minimum diameter area.

26. A fluororesin diaphragm valve structure, having a cooling gas flow channel, used for liquid transportation at <230° C. with forced cooling of an external gas, the cooling gas flow channel of the fluororesin diaphragm valve including an annular portion of a valve body, a diaphragm chamber of an upper valve body, a diaphragm, a tightening ring, and a valve shaft; the valve shaft being a hollow shaft and including a fixing end, a hollow shaft rod, and a plurality of gas guide holes; the cooling gas flow channel of the fluororesin diaphragm valve being characterized in that: the cooling gas flow channel includes one or more cooling gas holes for introducing an external cooling gas through a pipe joint, the cooling gas flows through a cooling gas annular groove provided on the inner side of the annular portion, a plurality of cooling gas guide holes provided on the tightening ring, a diaphragm space on a non-liquid contact side of the diaphragm chamber, and a plurality of vent holes provided on the fixing end of the valve shaft to an axis hole, and then the cooling gas is exhausted from the other side.

27. The fluororesin diaphragm valve structure as claimed in claim 26, wherein a leakage warning means is to collect vapor of leaking liquid through the pipe joint or the axis hole and connect a leak detection system.

28. A casing heat dissipation structure of a fluororesin diaphragm valve, which is a pneumatic valve having a heat dissipation enhancing structure, used for liquid transportation at 200° C. without forced cooling of an external gas and for liquid transportation at 230° C. with forced cooling of the external gas, the pneumatic valve including a driving cylinder, a valve portion and a sealing mechanism, the driving cylinder and the valve portion being respectively provided with four bolt posts, four metal bolts being used for airtightness; the driving cylinder including an upper valve body, a valve upper cover, a valve shaft, a cylinder space, and a partial structure of the valve portion; the valve shaft being a hollow shaft and including a fixing end, a shaft rod, a plurality of gas guide holes, and a piston; the cylinder space being an airtight space from the valve upper cover to the upper valve body, the piston dividing the cylinder space into a gas space and a spring space; the valve portion including a valve body, the upper valve body, a diaphragm, and the valve shaft; the valve body including an inlet, an outlet, a valve chamber, an annular portion, and a square portion; the diaphragm including a peripheral portion, an elastic portion, and a central portion; the annular portion being a cup-shaped structure having an opening, a bottom of the annular portion being defined as the valve chamber, the annular portion including a sealing surface, an external ring surface, a minimum diameter area, an internal screw thread, one or more cooling gas holes, a cooling gas annular groove, a joint surface, an internal ring surface, and the four bolt posts; the diaphragm including a peripheral portion, an elastic portion, and a central portion; the cylinder chamber being defined inside the valve upper cover; characterized in that: the valve upper cover includes an inner accommodating chamber, an internal ring surface, an external ring surface, a top, a central hole, a plurality of annular ribbed plates, the four bolt posts, and two gas posts; the annular ribbed plates are spaced and distributed on the external ring surface of the valve upper cover; the annular portion further includes two gas posts and a ribbed plate structure; the ribbed plate structure is disposed on the external ring surface of the annular portion and is composed of one or more annular ribbed plates and a plurality of vertical ribbed plates, the plurality of vertical ribbed plates are axially connected to all the annular ribbed plates through the square portion, an axial distribution position of the ribbed plate structure contains the minimum diameter area and the external ring surface and also contains an axial length of the inner screw thread.

29. The casing heat dissipation structure of the fluororesin diaphragm valve as claimed in claim 28, wherein the valve upper cover includes an inner accommodating chamber, an internal ring surface, an external ring surface, a top, a central hole, a ribbed plate structure, the four bolt posts, and two gas posts; the ribbed plate structure is disposed on the external ring surface of the valve upper cover and is composed of a plurality of spaced annular ribbed plates and a plurality of vertical ribbed plates, the annular ribbed plates are evenly distributed on the external ring surface at equal intervals, and the plurality of vertical ribbed plates contains an axial length of the external ring surface and are connected to all the annular ribbed plates.

30. A fluororesin diaphragm valve structure, comprising related parts and mechanisms of a valve portion; the valve portion including a valve body, a force-applying member, a valve upper cover, a diaphragm, a tightening ring, and a valve shaft; the valve body including an inlet, an outlet, and a valve chamber; the valve shaft being a hollow shaft and including a fixing end, a shaft rod, and a plurality of gas guide holes; the valve upper cover including an inner accommodating chamber, an external ring surface, a top, and a central hole; the diaphragm including a peripheral portion, an elastic portion, and a central portion; one end of the valve shaft having a fixing end capable of locking the central portion of the diaphragm; characterized in that: the valve body includes an annular portion and a square portion; the annular portion is a cup-shaped structure having an opening, a bottom of the annular portion is defined as the valve chamber, the annular portion includes a sealing surface, an external ring surface, a minimum diameter area, a ribbed plate structure, one or more cooling gas holes, a cooling gas annular groove and an internal ring surface, the opening is closed by the valve upper cover; the ribbed plate structure is composed of one or more annular ribbed plates and a plurality of vertical ribbed plates, the plurality of vertical ribbed plates are axially connected to all the annular ribbed plates through the square portion.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0126] FIG. 1A is a detailed schematic view of the sealing mechanism of the diaphragm valve according to an embodiment of the present invention;

[0127] FIG. 1B is a schematic view of the diaphragm of the diaphragm valve according to an embodiment of the present invention;

[0128] FIG. 1C is a schematic view of the tightening ring of the diaphragm valve according to an embodiment of the present invention;

[0129] FIG. 1D is a schematic view of the sealing surface and the force-applying angle of the diaphragm valve according to an embodiment of the present invention;

[0130] FIG. 1E is a schematic view of the C-shaped tightening mechanism of the diaphragm valve according to an embodiment of the present invention;

[0131] FIG. 2A is a detailed schematic view of the manual adjusting device of the diaphragm valve according to an embodiment of the present invention (the adjusting mechanism is a separate member);

[0132] FIG. 2B is a cross-sectional view of the valve shaft of the diaphragm valve according to an embodiment of the present invention;

[0133] FIG. 2B′ is a perspective view of the valve shaft of the diaphragm valve according to an embodiment of the present invention;

[0134] FIG. 2C is a cross-sectional view of the adjusting seat of the diaphragm valve according to an embodiment of the present invention;

[0135] FIG. 2C′ is a perspective view of the adjusting seat of the diaphragm valve according to an embodiment of the present invention;

[0136] FIG. 2D is a cross-sectional view of the adjusting wheel of the diaphragm valve according to an embodiment of the present invention;

[0137] FIG. 2D′ is a perspective view of the adjusting wheel of the diaphragm valve according to an embodiment of the present invention;

[0138] FIG. 2E is atop view of the C-shaped retaining ring of the diaphragm valve according to an embodiment of the present invention:

[0139] FIG. 2E′ is a cross-sectional view of the C-shaped retaining ring of the diaphragm valve according to an embodiment of the present invention;

[0140] FIG. 2F is a schematic view of the displacement indicator of the diaphragm valve according to an embodiment of the present invention;

[0141] FIG. 2G is a schematic view of the safety cover of the diaphragm valve according to an embodiment of the present invention;

[0142] FIG. 3A is a schematic view of the manual valve 1a for enhancing thermal isolation according to a first embodiment of the present invention:

[0143] FIG. 3B is a schematic view of the valve body and the annular portion of the manual valve 1a according to an embodiment of the present invention;

[0144] FIG. 3C is a cross-sectional view of the valve upper cover of the manual valve 1a according to an embodiment of the present invention;

[0145] FIG. 3C′ is a perspective view of the valve upper cover of the manual valve 1a according to an embodiment of the present invention;

[0146] FIG. 4A is a schematic view of the normally closed pneumatic valve 1d according to a second embodiment of the present invention:

[0147] FIG. 4B is a perspective sectional schematic view of the valve body of the normally closed pneumatic valve 1d according to an embodiment of the present invention:

[0148] FIG. 4C is a cross-sectional view of the upper valve body of the normally closed pneumatic valve 1d according to an embodiment of the present invention;

[0149] FIG. 4C′ is a perspective view of the upper valve body of the normally closed pneumatic valve 1d according to an embodiment of the present invention:

[0150] FIG. 4D is a cross-sectional view of the valve shaft assembly of the normally closed pneumatic valve 1d according to an embodiment of the present invention;

[0151] FIG. 4D′ is a perspective view of the valve shaft assembly of the normally closed pneumatic valve 1d according to an embodiment of the present invention;

[0152] FIG. 4E is a schematic view of the tightening ring having a groove of the normally closed pneumatic valve 1d according to an embodiment of the present invention:

[0153] FIG. 5A is a structural schematic view of the manual diaphragm valve 1b having the upper valve body according to a third embodiment of the present invention:

[0154] FIG. 5B is a structural schematic view of the manual diaphragm valve 1c having the upper valve body according to a fourth embodiment of the present invention;

[0155] FIG. 5C is a cross-sectional view of the valve upper cover and the adjusting seat of the manual diaphragm valve having the upper valve body according to an embodiment of the present invention;

[0156] FIG. 5C′ is a perspective view of the valve upper cover and the adjusting seat of the manual diaphragm valve having the upper valve body according to an embodiment of the present invention:

[0157] FIG. 5D is a schematic view of the locating ring of the manual diaphragm valve having the upper valve body according to an embodiment of the present invention;

[0158] FIG. 5E is a schematic view of the locating screw sleeve of the manual diaphragm valve having the upper valve body according to an embodiment of the present invention;

[0159] FIG. 5F is a cross-sectional view of the valve shaft assembly of the normally closed pneumatic valve 1d according to an embodiment of the present invention;

[0160] FIG. 5F′ is a perspective view of the valve shaft assembly of the normally closed pneumatic valve 1d according to an embodiment of the present invention;

[0161] FIG. 5F′ is another perspective view of the valve shaft assembly of the normally closed pneumatic valve 1d according to an embodiment of the present invention;

[0162] FIG. 6 is a schematic view showing that all the valves of the diaphragm valve are opened according to an embodiment of the present invention:

[0163] FIG. 7A is a schematic view of the normally open pneumatic valve 1e for enhancing thermal isolation according to a fifth embodiment of the present invention;

[0164] FIG. 7B is a schematic view of the valve body of the normally open pneumatic valve 1e for enhancing thermal isolation according to an embodiment of the present invention;

[0165] FIG. 7C is a schematic view of the valve upper cover of the normally open pneumatic valve 1e for enhancing thermal isolation according to an embodiment of the present invention:

[0166] FIG. 7D is anisometric sectional view of the normally open pneumatic valve 1e for enhancing thermal isolation according to an embodiment of the present invention;

[0167] FIG. 8 is a schematic view of the cooling gas flow channel of the normally open pneumatic valve 1e for enhancing thermal isolation according to an embodiment of the present invention; and

[0168] FIG. 9 is a schematic view of a conventional manual metal valve.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0169] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.

[0170] The present invention takes a manual diaphragm valve as an example, illustrating a sealing mechanism 3 (referring to FIG. 1A) and an adjusting mechanism 7 (referring to FIG. 2A) of a manual valve 1a. In a first embodiment, referring to FIG. 3A, the manual valve 1a has a valve upper cover 6a. The valve upper cover 6a has a sealing ribbed plate 66. The sealing ribbed plate 66 serves as a force-applying member and has the sealing mechanism 3a. In a second embodiment, referring to FIG. 4A, the adjusting mechanism 7 is modified to a limit mechanism and applied to a normally closed pneumatic valve 1d. The normally closed pneumatic valve 1d has a sealing mechanism 3b and an upper valve body 32. The upper valve body 32 serves as the force-applying. The limit mechanism includes a displacement indicator 76, a limit bolt 70, and a safety cover 79. In a third embodiment, referring to FIG. 5A, the independent adjusting mechanism 7 is applied to a normally closed pneumatic valve 1b. The normally closed pneumatic valve 1b has a sealing mechanism 3b and an upper valve body 32. The upper valve body 32 serves as the force-applying member. In a fourth embodiment, referring to FIG. 5B, the adjusting mechanism 7 is integrally installed with the valve upper cover, as a normally closed pneumatic valve 1c. A fifth embodiment describes an enhanced thermal isolation mechanism of a normally open pneumatic valve 1e. The normally open pneumatic valve 1e has a sealing mechanism 3b and an upper valve body 32. The upper valve body 32 serves as the force-applying member. A sixth embodiment describes a cooling gas flow channel 16. The following implementations will be described in further detail.

[0171] For all the descriptions, please refer to FIG. 1A, FIG. 1B, FIG. 1C, FIG. 1D, FIG. 1E. FIG. 2A, FIG. 2B, FIG. 2B′, FIG. 2C, FIG. 2C′, FIG. 2D, FIG. 2D′, FIG. 2E, FIG. 2E′, FIG. 2F, FIG. 2G, FIG. 3A, FIG. 3B, FIG. 3C. FIG. 3C′, FIG. 4A, FIG. 4B, FIG. 4C, FIG. 4C′, FIG. 4D, FIG. 4D′, FIG. 4E, FIG. 5A, FIG. 5B, FIG. 5C, FIG. 5C′, FIG. 5D, FIG. 5E, FIG. 5F, FIG. 5F′, FIG. 5F″, FIG. 6, FIG. 7A, FIG. 7B, FIG. 7C, FIG. 7D, FIG. 8, and FIG. 9.

[0172] The following takes the basic mode and the first implementation mode as the main example and includes different embodiments of the second implementation mode, the third implementation mode and the fourth implementation mode. Different numerals represent structural adjustments. For example, the ribbed plate structure 244a/244b/244c means that there are three implementation modes of a ribbed plate structure 244, marked with three numerals 244a, 244b, 244c, all of which achieve the same effect.

[0173] For a sealing mechanism 3a/3b, the following takes the basic mode and the first implementation mode as the main example.

[0174] Referring to FIG. 1A, the sealing mechanism 3a/3b includes a diaphragm 30, a tightening ring 31, a tightening surface 327/662, a sealing surface 240, an annular portion 24a/24b/24c, and a ribbed plate structure 244a/244b/244c. The sealing mechanism 3a/3b is based on a valve body 2a/2b/2c as the main structure. The valve body 2a/2b/2c includes an inlet 21, an outlet 22, a valve chamber 23, the annular portion 24a/24b/24c, and a square portion 25a/25b.

[0175] The annular portion 24a/24b/24c is an open cup-shaped structure and is sealed by a valve upper cover 6a/6b/6c, and includes the sealing surface 240, an external ring surface 245, a minimum diameter area 241, the valve chamber 23, and the ribbed plate structure 244a/244b/244c. The sealing surface 240 is disposed on the outer edge of the valve chamber 23. A square portion 25a/25b is provided under the valve chamber 23 and coupled with the valve chamber 23 to provide a support. The ribbed plate structure 244a/244b/244c is located on the external ring surface 245 of the annular portion 24a/24b/24c. The annular portion 24a/24b/24c further includes one or more cooling gas hole 162 and a cooling gas annular groove 163.

[0176] The valve upper cover 6a/6b/6c includes an inner accommodating chamber 61, an external ring surface 62, a top 63, a central hole 64, and a sealing ribbed plate 66. The tightening face 662/327 is derived from the force-applying member, parts or structures of other valve structures. For example, the force-applying member is the sealing ribbed plate 66 or an upper valve body 32. These parts or structures will be tightly locked with the annular portion 24a/24b/24c.

[0177] The ribbed plate structure 244a/244b/244c is an annular latticed structure with a plurality of horizontal openings. One side of the ribbed plate structure 244a/244b/244c in the axial direction is connected with the square portion 25a/25b, and the distribution position contains the minimum diameter area 241. The other side of the ribbed plate structure 244a/244b/244c in the axial direction contains the tightening ring 31.

[0178] The ribbed plate structure 244a/244b/244c is composed of one or more spaced annular ribbed plates and a plurality of spaced vertical ribbed plates. The plurality of vertical ribbed plates are axially connected to all the annular ribbed plates through the square portion 25a/25b.

[0179] Referring to FIG. 1B, the diaphragm 30 includes a peripheral portion 301, an elastic portion 302, and a central portion 303. The peripheral portion 301 includes upper and lower side surfaces. The upper side surface is defined as a force-receiving surface 304, and the lower side surface is defined as a fitting surface 305.

[0180] Referring to FIG. 1C, the tightening ring 31 is an annular structure with an approximately rectangular cross-section, and has two ends defined as a force-receiving end 314 and a tightening end 315. The tightening end 315 is an obtuse angle β, and in the best embodiment, 110°≤β≤150°.

[0181] Referring to FIG. 1D, when the diaphragm 30 is expanded and deformed under the pressure of the pipeline, the peripheral portion 301 will be applied with a force and pulled to generate a displacement. The peripheral portion 301 has a wedge-shaped cross-section, with a greater thickness on its outer side and a less thickness on its inner side connected to the elastic portion. The peripheral portion 301 includes upper and lower side surfaces. The upper side surface is defined as the force-receiving surface 304, and the lower side surface is defined as the fitting surface 305. The fitting surface 305 and the force-receiving surface 304 are mutually non-planar surfaces or conical surfaces. The fitting surface 305 is attached to the sealing surface 240 of the annular portion 24a/24b/24c. The force-receiving surface 304 will be pressed tightly by the tightening end 315 of the tightening ring 31. The sealing surface 240 may be a conical surface or a planar surface.

[0182] Referring to FIG. 1A and FIG. 2B, the valve shaft 4a/4b/4c is a hollow shaft, including a fixing end 41 and a shaft rod 42. The fixing end 41 has a plurality of gas guide holes 413 and a bolt hole 411. The fixing end 41 may be installed with a bolt 414 and a nut 412 to lock the diaphragm 30 tightly. The valve shaft 4a/4b/4c and the diaphragm 30 can rotate relative to each other. The tightening ring 31 is installed on the peripheral portion 301 of the diaphragm. The diaphragm 30 is mounted on the sealing surface 240 of the annular portion 24a/24b/24c together with the axis.

[0183] Referring to FIG. 1D, when locked, the tightening surface 327/662 and the force-receiving end 314 slide, and a tightening force F is applied to the force-receiving end 314, so that the tightening end 315 having an obtuse angle β (referring to FIG. 1C) can be stationary and tightened on the peripheral portion 301. When the sealing surface 240 is tightened by the force F, it is supported by the ribbed plate structure 244a/244b/244c of the annular portion 24a/24b/24c, and is supported by the square portion 25a/25b and the flow channel side wall of the valve chamber 23. The tightening force F has a force-applying angle ε with the normal line N of the peripheral portion 301, and the force-applying angle c is in the range 0°<ε≤15°. The tightening ring 31 is deformed by the force and applies a force to the peripheral portion 301 of the diaphragm 30. At the same time, the sealing surface 240 to which the peripheral portion 301 is attached is also applied with the force. The structure of the minimum diameter area 241 and the square portion 25a/25b below the sealing surface 240 also provides a support. The minimum diameter area 241 has a heat transfer restriction area to reduce heat transfer.

[0184] Referring to FIG. 1E, the tightening surface 327/662 connects the annular portion 24a/24b/24c to the sealing surface 240 to form a C-shaped tightening structure 18. A tightening portion 181 of the C-shaped tightening structure 18 includes the force-applying member 66. In the figure, the force-applying member is a sealing ribbed plate 66 of a valve upper cover 6a, and the force-applying member 66 is tightly locked to the annular portion 24a/24b/24c. A support arm 182 of the C-shaped tightening structure 18 provides overall structural strength for the annular portion 24a/24b/24c and the ribbed plate structure 244a/244b/244c. A base 183 of the C-shaped tightening structure 18 is the sealing surface 240, which is supported by the minimum diameter area 241, the flow channel side wall of the valve chamber 23 and the ribbed plate structure 244a/244b/244c. The tightening surface 327/662 is moved downward by locking tightly, so that the tightening ring 31 and the diaphragm 30 are clamped by the tightening surface 327/662 and the sealing surface 240 to prevent leakage.

[0185] Please refer to FIG. 2A. An adjusting mechanism 7 will be implemented in different embodiments. Different numerals represent different structural adjustments, which all achieve the same adjustment effect for the opening degree of the valve. The adjusting mechanism 7 can be bolted to the top 63 of a valve cover 6a/6b/6c, and includes the valve shaft 4a/4b/4c/4d, an adjusting seat 71, an adjusting wheel 74, a displacement indicator 76, a positioning nut assembly 77, a locking nut assembly 78, and a safety cover 79. Each of the positioning nut assembly 77 and the locking nut assembly 78 is composed of two nuts.

[0186] Please refer to FIG. 2B and FIG. 2B′, illustrating the valve shaft 4a/4b/4c/4d. The valve shaft 4a further includes a slide portion 45, an adjusting screw thread 46, and a locking screw thread 47. The slide portion 45 is an axle having a pair of parallel cut-out sides.

[0187] Please refer to FIG. 2C and FIG. 2C′. The adjusting seat 71 includes a shoulder 711, a neck 712, an internal space 713, an external ring groove 716, a tool opening 717, and a slide hole 718. The adjusting seat 71 may be integrated with the valve upper cover 6a/6b/6c, or the adjusting seat 71 and the valve upper cover 6a/6b/6c may be individual parts to be tightly locked with bolts. In the best embodiment, they are individual parts. The adjusting seat 71 includes a positioning post 719 to be coupled to a positioning hole 69 (referring to FIG. 2A) of the valve upper cover 6a/6b/6c, so as to ensure the concentric positioning of the valve shaft 4a/4b/4c. The adjusting seat 71 is provided with a plurality of bolt holes (not shown) to be tightly locked to a plurality of threaded holes (not shown) of the valve upper cover.

[0188] Please refer to FIG. 2D and FIG. 2D′. The adjusting wheel 74 includes a top 741, an external ring surface 742, an internal ring surface 743, an internal ring groove 744, a hub 745, an adjusting threaded hole 746, and a tool opening 747.

[0189] Please refer to FIG. 2E and FIG. 2E′. A C-shaped retaining ring 75 has an external ring 751, an inner diameter hole 752, an opening portion 753, two tool holes 754, a width B, and a thickness T. Two ends of the opening portion 753 have the tool holes 754. The inner side of a positioning post 755 is located on the inner diameter of the inner diameter hole 752. The radial thickness of the positioning post 755 is not greater than the depth of the tool opening 717 of the adjusting seat 71.

[0190] Please refer to FIG. 2F. The displacement indicator 76 in the form of a gate-shaped strip is installed on the top 741 of the adjusting wheel 74. The displacement indicator 76 includes a displacement space 761, a displacement scale 762, two fixing holes 763, and a central hole 764.

[0191] Please refer to FIG. 2F and FIG. 2G. The adjusting mechanism 7 may be installed with the safety cover 79. The safety cover 79 includes an inner accommodating chamber 791, a fixing side 792, a locking rib 793, and a locking hole 794. The displacement indicator 76 further includes a safety seat 765, a locking rib 766, and a locking hole 767. The fixing side 792 of the safety cover 79 may be installed to the safety seat 765 having a notch 768 of the displacement indicator 76. The inner accommodating chamber 791 of the safety cover 79 covers the entire displacement indicator 76, so that the locking rib 793 of the safety cover 79 can cooperate with the locking rib 766 of the displacement indicator 76, and the two communicating locking holes 767, 794 are locked with one lock, which can be opened only by using a key, so as to prevent incorrect operations by an unrelated person. Although the adjusting wheel 74 is not covered, the valve shaft 4a and the displacement indicator 76 are tightly locked together by the locking nut assembly 8 (as shown in FIG. 2A). At this time, the adjusting wheel 74 cannot be operated.

[0192] Please refer to FIG. 2A. The slide portion 45 of the valve shaft 4a/4b/4c/4d is coupled with the slide hole 718 of the adjusting seat 71 to prevent rotation of the valve shaft 4a/4b/4c/4d. The adjusting screw thread 46 of the valve shaft 4a/4b/4c/4d is coupled with the adjusting threaded hole 746 of the hub 745, and the adjusting wheel 74 can be rotated to move the valve shaft 4a/4b/4c/4d upward or downward. The locking screw thread 46 of the valve shaft 4a/4b/4c/4d passes through the adjusting threaded hole 746 of the adjusting wheel 74 and the central hole 764 of the displacement indicator 76.

[0193] Please refer to FIG. 1A and FIG. 2A. When the diaphragm 30 is properly locked on the valve seat 231 of the valve chamber 23, the valve is completely closed at this time, which is equivalent to the zero point of the opening degree of the valve. The lower nut of the positioning nut assembly 77 is adjusted and attached to the top 741 of the adjusting wheel 74, and the positioning nut assembly 77 is fixed on the valve shaft 4a/4b/4c/by locking the upper nut tightly. The middle of two nuts of the positioning nut assembly 77 serves as the reference plane for position indication, corresponding to the zero point of the displacement scale 762 of the displacement indicator 76. When the valve is closed, the valve shaft 4a/4b/4c/4d moves downward, and the positioning nut assembly 77 is attached to the top 741 of the adjusting wheel 74 to prevent the valve shaft 4a/4b/4c/4d from continuing to move downward and causing overpressure of the diaphragm 30.

[0194] At the position of an appropriate opening degree of the valve, the locking nut assembly 78 tightly locks the valve shaft 4a/4b/4c/4d on the displacement indicator 76, so that the pipeline pressure wave borne by the valve shaft 4a/4b/4c/4d is transmitted to the adjusting wheel 74 and is transmitted to the valve body structure through the C-shaped retaining ring, preventing the adjusting screw thread 46 of the valve shaft 4a/4b/4c/4d from being damaged by the pipeline pressure wave.

[0195] The displacement indicator 76 includes the displacement scale 762 for reading the position of the opening degree of the valve. The zeroed joint line between the two nuts of the positioning nut assembly 77 is used as an indicator, and the reading corresponding to the displacement scale 762 is the opening degree of the valve.

[0196] The C-shaped retaining ring 75 is installed in a groove that is composed of the external ring groove 716 of the adjusting seat 71 and the internal ring groove 744 of the adjusting wheel 74. The outer diameter of the C-shaped retaining ring 75 is less than the inner diameter of the internal ring groove 744. The inner diameter of the C-shaped retaining ring 75 is greater than the inner diameter of the external ring groove 716. The C-shaped retaining ring 75 is configured to axially position the adjusting wheel 74 at an axial fixing position on the adjusting seat 71.

[0197] The internal ring groove 744 and the external ring groove 716 have the same groove width W, and are slidably fitted with the thickness T of the C-shaped retaining ring 75. The groove width is W-0.0 mm>=T>=W-0.1 mm. The adjusting wheel 74 can rotate smoothly relative to the adjusting seat 71, and the pipeline pressure wave is transmitted to the annular portion 24a/24b/24c via the valve shaft 4a/4b/4c/4d.

[0198] The positioning post 755 of the C-shaped retaining ring 75 is positioned in the tool opening 717 of the adjusting seat 71 to ensure that the C-shaped retaining ring 75 will not rotate with the adjusting wheel 74 to facilitate maintenance, referring to FIG. 2E and FIG. 2E′.

[0199] The adjusting threaded hole 746 of the hub 745 of the adjusting wheel 74 provides positioning and rotating functions through the C-shaped retaining ring 75. The slide hole 718 of the adjusting seat 71 provides the function to stop rotation of the valve shaft 4a/4b/4c/4d. Only three parts are used to complete the function of the second type of the transmission of the valve shaft.

[0200] In the first embodiment, referring to FIG. 3A, the manual valve 1a includes a sealing mechanism 3a, an adjusting mechanism 7 and a valve portion 10a. The sealing mechanism 3a is explained based on the first implementation mode. The valve portion 10a includes a valve body 2a, a valve upper cover 6a, the diaphragm 30, the tightening ring 31, and a valve shaft 4a.

[0201] Please refer to FIG. 3A and FIG. 3B. The valve body 2a includes the inlet 21, the outlet 22, the valve chamber 23, an annular portion 24a, and a square portion 25a. The outlet 22, the inlet 21 and the valve chamber 23 are the fluid flow space for conveying liquid, as a heat source area 15. Both the annular portion 24a and the square portion 25a have a heat transfer restriction structure 151. The annular portion 24a further includes an external screw thread 243 and an internal ring surface 247. The valve shaft 4a passes through a central hole 64 of the shaft hub portion 68 of the valve upper cover 6a, so that the valve upper cover 6a can be tightly locked to the external screw thread 243 of the annular portion 24a.

[0202] Please refer to FIG. 3A, FIG. 3B and FIG. 3C. The valve upper cover 6a further includes a shaft hub portion 68 and a central hole 64. The valve upper cover 6a further includes the axially annular sealing ribbed plate 66 located between the shaft hub portion 68 and the internal screw thread 65, a threaded groove 663 located between the annular sealing ribbed plate 66 and the internal screw thread 65, and a shaft hub groove 664 located between the shaft hub portion 68 and the annular sealing ribbed plate 66. The lower end of the annular sealing ribbed plate 66 is formed with an annular tightening groove 661. The opening of the groove faces the threaded groove 663 and faces downward. A tightening surface 662 is provided at the upper bottom of the tightening groove 661. The tightening ring 31 is installed in the annular tightening groove 661. A plurality of radial ribs 683 are connected between the annular sealing ribbed plate 66 and the shaft hub portion 68 to provide higher rigidity of the sealing ribbed plate 66 and to isolate the heat transferred from the valve shaft 4a. The exterior ring surface of the sealing ribbed plate 66 is provided with a plurality of convex longitudinal ribs 665. The plurality of convex longitudinal ribs 665 are adjacent to the internal ring surface 247 of the annular portion 24a to provide structural rigidity and to isolate the heat transferred from the peripheral portion 301 of the diaphragm 30.

[0203] As shown in FIG. 3A, the structural support of the sealing mechanism 3a includes the annular portion 24a, the diaphragm 30, the tightening ring 31, the ribbed plate structure 244a, and the valve upper cover 6a. The other side of the ribbed plate structure 244a in the axial direction is connected to the external screw thread 243. When the valve upper cover 6a is tightly closed by the annular portion, the structure of the annular portion 24a will be embedded in the threaded groove 663.

[0204] As shown in FIG. 3A, the adjusting mechanism 7 is installed on the top 63 of the valve upper cover 6a, and is coupled to the positioning hole 69 of the valve upper cover 6a via the positioning post 719 of the adjusting seat 71. The adjusting mechanism 7 includes the valve shaft 4a, the adjusting seat 71, the adjusting wheel 74, the displacement indicator 76, the positioning nut assembly 77, the locking nut assembly 78, and the safety cover 79.

[0205] In the second embodiment, referring to FIG. 4A, FIG. 4D and FIG. 4D′, the displacement indicator 76 is applied to a normally closed pneumatic valve 1d having a sealing mechanism 3b. The sealing mechanism 3b is described based on the second implementation mode and third implementation mode, and the displacement indicator 76 has the function to limit the opening degree.

[0206] The normally closed pneumatic valve 1d includes a valve portion 10b, a driving cylinder 10d, the sealing mechanism 3b, and the displacement indicator 76. The valve portion 10b includes a valve body 2b, the diaphragm 30, the tightening ring 31, the upper valve body 32, and the valve shaft 4b. The driving cylinder 10d is a cylinder space 17 airtight from the upper valve body 32 to the valve upper cover 6b. The piston 44 of the valve shaft 4b divides the space into a gas space 171 and a spring space 172. A set of springs is installed in the upper spring space 172 to keep the diaphragm 30 normally closed. The lower gas space 171 is introduced with high-pressure air to open the diaphragm 30. The opening degree of the valve can be set via the adjusting mechanism 7. The valve upper cover 6b further includes an internal screw thread 65, a displacement height H (referring to FIG. 5A), and a positioning hole 69.

[0207] Referring to FIG. 4B, the valve body 2b includes the inlet 21, the outlet 22, the valve chamber 23, an annular portion 24b, and a square portion 25a. The annular portion 24b further includes an internal screw thread 242, an external screw thread 243, the ribbed plate structure 244b, and an internal ring surface 247.

[0208] Referring to FIG. 4C and FIG. 4C′, the upper valve body 32 includes a locking screw thread 321, a tightening groove 322, a shaft hole 323, one or more annular grooves 324, a plurality of groove ribbed plates 325, a diaphragm chamber 326, and the tightening surface 327.

[0209] Referring to FIG. 4D and FIG. 4D′, the valve shaft 4b is a hollow shaft, including the fixing end 41, the hollow shaft rod 42, the plurality of gas guide holes 413, and the piston 44. The piston 44 is located at the middle of the valve shaft 4b. The piston 44 has a disc shape and includes a plurality of vertical ribbed plates 442 and one or more annular ribbed plates 441. The annular ribbed plate 441 is coupled with the annular groove 324 of the upper valve body 32. The vertical ribbed plates 442 are configured to apply a torsion force to lock the upper valve body 32 tightly.

[0210] Referring to FIG. 4D, FIG. 4D′ and FIG. 4E, the tightening ring 31 is installed in the tightening groove 322 of the upper valve body 32. The force-receiving end 314 is connected to the tightening surface 327, and an O-ring groove 313 is provided on the exterior ring side of the force-receiving end 314. The tightening end 315 is joined to the force-receiving surface 304. When the locking screw thread 321 of the upper valve body 32 is tightly engaged with the internal screw thread 242 of the annular portion 24b (referring to FIG. 4A), the tightening surface 327 of the annular groove 324 applies a force F to the force-receiving end 314, so that the tightening end 315 having an obtuse angle β is pressed against the force-receiving surface 304.

[0211] Referring to FIG. 4A, the sealing mechanism 3b includes the annular portion 24b, the diaphragm 30, the tightening ring 31, the ribbed plate structure 244b, and the upper valve body 32. When the upper valve body 32 is tightly locked to the internal screw thread 242 and pressed against the tightening ring 31, the sealing mechanism 3b is supported by external ring side of the sealing surface 240 and the ribbed plate structure 244b. The lower side of the sealing surface 240 is supported by the square portion 25a and the side wall of the flow channel 232 of the valve chamber 23, and also includes the structure near the minimum diameter area 241.

[0212] The sealing mechanism 3b and the external screw thread are disposed on the external ring surface 245 of the annular portion 24b, and the sealing mechanism 3b is located below the external screw thread 243. The axial distribution position of the ribbed plate structure 244b contains the minimum diameter area 241 and a plurality of screw threads of the internal screw thread 242. The other side of the ribbed plate structure 244b in the axial direction is connected to the external screw thread 243 to increase the structural strength and heat dissipation effect of the sealing mechanism 3b. The internal screw thread 242 and the external screw thread 243 of the annular portion 24b have a plurality of threads overlapping in the axial position. That is, the axial position distribution of the internal screw thread 242 is covered by the axial length of the outer screw thread 243 and the ribbed plate structure 244. When the valve upper cover 6b is tightly locked with the external screw thread 243 of the annular portion 24b, the valve upper cover 6b will also provide additional structural support for the upper valve body 32.

[0213] Referring to FIG. 4A, the displacement indicator 76 is installed on the top 63 of the valve upper cover 6b. The bottom of the displacement indicator 76 is provided with two positioning posts 769 coupled with the positioning hole 69 of the valve upper cover 6b. The displacement indicator 76 further includes a limit bolt 70, the locking nut assembly 78, and the safety cover 79.

[0214] The limit bolt 70 is first installed with the locking nut assembly 78, and passes through the central hole 764 of the displacement indicator 76. The locking nut assembly 78 is installed from the tail end of the limit bolt until the tail end of the limit bolt 70 reaches a required height. The height is also in line with the height of the valve shaft 4b to be moved upward. At this time, the limit bolt 70 is tightly locked with the locking nut assembly 78. When the high pressure gas is introduced into the driving cylinder 10d, the tail end of the valve shaft 4b will be blocked by the limit bolt 70. The safety cover 79 is configured to protect the displacement indicator 76.

[0215] The third embodiment, referring to FIG. 5A, is changed from the second embodiment to a manual valve 1b. The sealing mechanism 3a is explained based on the second implementation mode and the third implementation mode. The manual valve 1b no longer has the driving cylinder 10d, but still has the sealing mechanism 3b and the adjusting mechanism 7. The manual valve 1b is composed of the valve portion 10b, the sealing mechanism 3b and the adjusting mechanism 7. The valve portion 10b includes the valve body 2b, the valve shaft 4c, the upper valve body 32, the diaphragm 30, the tightening ring 31, and the valve upper cover 6b. The valve upper cover 6b has a displacement height H.

[0216] The adjusting mechanism 7 is installed on the top 63 of the valve upper cover 6b. The shoulder 711 of the adjusting seat 71 has a plurality of round holes to facilitate the locking of the adjusting mechanism 7. After the sealing mechanism 3b is tightly locked, the valve shaft 4c will no longer rotate.

[0217] Referring to FIG. 5F, there is no need for the valve shaft 4c to have the slide portion 45 and for adjusting seat 71 to have the slide hole 718. The valve shaft 4c can be inserted through the central hole 64 of the valve cover 6b to close the annular portion 24b. The valve shaft 4c and the central hole 64 will not interfere with rotation. The positioning post 719 of the adjusting seat 71 is coupled with the positioning hole 69 of the valve upper cover 6b, so that the adjusting mechanism 7 is mounted on the valve shaft 4c. When the adjusting wheel 74 is turned to open the diaphragm, the valve shaft 4c will rotate upward until the vertical ribbed plate 442 on the upper side of the piston 44 has completed its stroke H and will touch the top of the inner accommodating chamber 61 of the valve upper cover 6b.

[0218] The fourth embodiment, referring to FIG. 5B, is changed from the third embodiment to a manual valve 1b. The adjusting seat 71 of the adjusting mechanism 7 of the manual valve 1c is integrally with the valve upper cover 6b, and the other components of the sealing mechanism 3b are still used. Because the adjusting seat 71 of this embodiment is integrated with the valve upper cover 6b, after the valve portion 10b is assembled with the sealing mechanism 3b, the valve shaft 4d cannot be inserted through the central hole 64 of the valve upper cover 6b and then through the slide hole 718. Because this will cause the valve shaft 4d to rotate and drive the annular ribbed plate 441 of the piston 44 (referring to FIG. 5F. FIG. 5F and FIG. 5F″) to rotate the locked upper valve body 32, causing a rotation interference of the rotating shaft.

[0219] Please refer to FIG. 5C and FIG. 5C′. The solution is to install a locating seat 714 and a locating screw thread 715 in an internal space 713 of an adjusting seat 71, and a locating ring 72 and a locating screw sleeve 73 (referring to FIG. 5B) are provided, instead of the slide hole 718 of the adjusting seat 71.

[0220] Referring to FIG. 5D, the locating ring 72 includes a flange 721, an external ring surface 722, and an elongate hole 723.

[0221] Referring to FIG. 5E, the locating screw sleeve 73 includes an external screw thread 731, a central hole 732, and a twisting portion 733.

[0222] Referring to FIG. 5B, FIG. 5C, FIG. 5C′ FIG. 5D and FIG. 5E, one end of the valve shaft 4d passes through the central hole 64 of the valve upper cover 6b, the valve upper cover 6b can be tightly locked to the external screw thread 243 of the annular portion 24b, and then the locating ring 72 can be installed on the locating seat 714. The outer diameter of the flange 721 of the locating ring 72 is greater than the central hole 64. The external ring surface 722 is slidably fitted with the central hole 64 to achieve an axis positioning function. The elongate hole 723 cooperates with the slide portion 45 of the valve shaft 4d. After the locating screw sleeve 73 is tightly locked in the locating screw hole 715 via the tightening portion 733, the locating ring 72 is fixed and the valve shaft 4d cannot be rotated. Then, the C-shaped retaining ring 75 is installed to the external groove 716 with a tool, and then the adjusting wheel 74 is installed.

[0223] Please refer to FIG. 6, which is a comparison view of the fully open/closed valve of the manual valve 1c of the fourth embodiment.

[0224] The fifth embodiment, referring to FIG. 7A, is changed from the second embodiment to a normally open pneumatic valve 1e. The sealing mechanism 3b is explained based on the second implementation mode and the fourth implementation mode, illustrating the structure for further improving the heat dissipation capability. The normally open pneumatic valve 1e includes a driving cylinder 10d, a valve portion 10c, and a sealing mechanism 3b. The driving cylinder 10d has a heat dissipation enhancing structure. The driving cylinder 10d and the valve portion 10c are tightly locked with four metal bolts passing through four bolt posts 13 to be airtight.

[0225] Referring to FIG. 7D, the driving cylinder 10d is a cylinder space 17 airtight from the upper valve body 32 to the valve upper cover 6c. The piston 44 of the valve shaft 4b divides the space into a gas space 171 and a spring space 172. A set of springs is installed in the upper spring space 172 to keep the diaphragm 30 normally open. The lower gas space 171 is introduced with high-pressure air to close the diaphragm 30.

[0226] The valve portion 10c includes a valve body 2c, the upper valve body 32, a diaphragm 30, the valve shaft 4b, and a tightening ring 31.

[0227] Referring to FIG. 7B and FIG. 7D, the valve body 2c further includes an annular portion 24c and a square portion 25b. The annular portion 24c further includes an internal screw thread 242, a ribbed plate structure 244c, a joint surface 246, four bolt posts 13, and a gas post 14. The annular portion 24c and the valve upper cover 6c are tightly locked with metal bolts passing through the bolt posts 13. The joint surface 246 and the joint surface 67 are tightly sealed. The bolt post 13 of the valve upper cover 6c has a bolt hole. The bolt post 13 of the annular portion 24c has a metal nut inside. A bolt passes through the bolt hole and locks the nut to achieve a tight seal.

[0228] Referring to FIG. 7C and FIG. 7D, the valve upper cover 6c further includes a plurality of annular ribbed plate 621, a plurality of the bolt posts 13, an internal ring surface 611, and a plurality of gas posts 14. The internal ring surface 611 serves as a sealing slide surface of the piston 44. The inside of the valve upper cover 6c is defined as the gas space 171. The annular ribbed plate 621 axially distributes the axial length of the valve upper cover, and also contains the axial length of the internal ring surface 611, and connects the bolt posts 13 and the gas posts 14. When high reliability is required in a high temperature environment, a plurality of annular ribbed plates 621 of the valve upper cover 6c are replaced by the ribbed plate structure 244c (not shown) to ensure the structural rigidity of the cylinder space 17.

[0229] Referring to FIG. 7D, the four corners of the valve upper cover 6c and the annular portion 24c have the bolt posts 13 respectively, and are installed above the minimum diameter area of the annular portion 24c and spaced apart from and located above the square portion 25b, that is, located above the heat source area 15 and the minimum diameter area 241, so as to prevent the thick structure of the bolt post 13 from becoming a large heat transfer area to cause a failure in thermal isolation. There is a seal between the joint surface 246 and the joint surface 67 to ensure that the metal bolt is not corroded.

[0230] The upper cover 6c has an inlet pipe communicating with a high-pressure driving gas. The driving gas passes through the gas space 171. The upper cover 6c has an inlet pipe communicating with a cooling gas and connected to the annular portion 24c via the gas post. The annular portion 24c is provided with a cooling gas hole for internal cooling. The cooling gas hole is disposed above the minimum diameter area 241 and is spaced apart from and located above the square portion 25b, that is, located above the heat transfer restriction area and the minimum diameter area 241, so as to prevent the thick structure from becoming a large heat transfer area to cause a failure in thermal isolation. Both the gas post 13 and the cooling gas hole 162 have an O-ring for airtightness.

[0231] Referring to FIG. 7D, the sealing mechanism 3b includes the annular portion 24c, the diaphragm 30, the tightening ring 31 and the upper valve body 32 and is located above the heat transfer restriction area. The ribbed plate structure 244c of the sealing mechanism 3b is composed of more than one annular ribbed plate and a plurality of vertical ribbed plates. The plurality of vertical ribbed plates are axially connected to all the annular ribbed plates through the square portion. The axial distribution position of the ribbed plate structure 244c contains the minimum diameter area 241 and the external ring surface 245, and also contains the axial length of the internal screw thread 242 in the axial position, and connects the bolt posts 13 and the gas posts 14. When the valve upper cover 6c is tightly locked, both the annular ribbed plate 621 and the sealing mechanism 3b increase the structural strength and heat dissipation effect of the cylinder space 17. Especially, when the ambient temperature is 100° C., the heat dissipation area is greatly increased.

[0232] The sixth embodiment, referring to FIG. 8, illustrates the cooling gas flow channel 16. The external ring surface of the annular portion 24 is provided with one or more cooling gas holes 162 for introducing an external cooling gas through a pipe joint. The pipe joint is located above the minimum diameter area 241. The cooling gas flows through a cooling gas annular groove 163 provided on the inner side of the annular portion 24, a plurality of cooling gas guide holes 164 provided on the tightening ring 31, a diaphragm space 165 on a non-liquid contact side of the diaphragm chamber 326, and a plurality of vent holes 166 provided on the fixing end 41 of the valve shaft 4b to the shaft hole 167, and then the cooling gas is exhausted from the pipe joint or from the outlet of the shaft. The annular portion 24 is provided with a cooling gas hole to communicate with the external cooling gas. The cooling gas hole is disposed above the minimum diameter area 241 and is spaced apart from and located above the square portion 25, that is, located above the heat transfer restriction area and the heat source area 15, so as to prevent the thick structure from becoming a large heat transfer area to cause a failure in thermal isolation. The method to collect the vapor of the leaked liquid as a leakage warning (problem 9) is to connect a collection pipe detection system from the cooling gas hole 162 or connect a collection pipe from the tail end of the valve shaft 4 through the shaft hole 167 for detection.