Abstract
A valve with a controlled closing system includes housing having an inlet port, a liquid outlet port, and an inlet chamber. A pressure responsive closing mechanism is disposed between the inlet port and the liquid outlet port. A control chamber is in fluid communication with the inlet chamber via a fluid passage. The fluid passage includes a controlled closing system for controlling opening and closing of the fluid passage. The controlled closing system includes a seal movable with respect to and sealable against an opening of the fluid passage.
Claims
1-5. (canceled)
6. A method of using a valve comprising: using a valve that comprises: a housing having an inlet port, a liquid outlet port, an inlet chamber, a pressure responsive closing mechanism disposed between said inlet port and said liquid outlet port and configured tor selectively opening a liquid flow path therebetween, a control chamber in fluid communication with said inlet chamber via a fluid passage, a gas operated valve in fluid communication with said control chamber and with an outlet aperture, wherein said closing mechanism is configured to be displaced into an open position to permit liquid flow along said flow path between said inlet port and said liquid outlet port; and wherein said fluid passage comprises a controlled closing system for controlling opening and closing of said fluid passage, said controlled closing system comprising a seal movable with respect to and sealable against an opening of said fluid passage, and wherein said seal does not seal against said fluid passage, said pressure responsive closing mechanism seals against said inlet port, and said gas operated valve docs not seal against said outlet aperture, so that gas entering said inlet port of die valve can rise and flow past said seal through said fluid passage, and flow out said outlet aperture; and comprising another mode of operation wherein said pressure responsive closing mechanism seals said inlet port, and as soon as fluid cannot Slow anymore to said liquid outlet port, said seal immediately drops to open said fluid passage.
7-10. (canceled)
11. The method according to claim 6, wherein said opening of said fluid passage faces said inlet port.
12. The method according to claim 6, wherein said opening is at an end of a tube.
13. The method according to claim 6, wherein said seal is free to move axially in a bore of a seal housing.
14. The method according to claim 6, wherein said seal is spherical and is denser than liquid entering said inlet port.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The present invention will be understood and appreciated more fully from the following detailed description taken in conjunction with the drawings in which:
[0021] FIGS. 1A and 1B are simplified cutaway illustrations of a prior art liquid discharge valve, as described in European Patent 3039326;
[0022] FIGS. 2-6 are simplified cutaway illustrations of a controlled closing system for a hydraulic valve liquid discharge valve, constructed and operative in accordance with a non-limiting embodiment of the present invention, wherein:
[0023] In FIG. 2, a movable seal of the closing system does not seal against a fluid passage between an inlet chamber and a control chamber of the valve, a plunger assembly of a pressure responsive closing mechanism seals against an inlet of the valve, and a float member of a gas operated valve does not press a closure membrane to seal against an outlet aperture of the gas operated valve, so that air entering the inlet of the valve can rise and flow through the fluid passage between the inlet chamber and the control chamber, flow past the float member and flow out the outlet aperture of the gas operated valve to the outside environment;
[0024] In FIG. 3, the pressure in the inlet chamber is greater than the atmospheric pressure which is the pressure in the control chamber; this pressure difference causes the plunger assembly of the pressure responsive closing mechanism to rise and allow liquid (water) and gas (air) to enter the inlet, which causes the movable seal of the closing system to rise and seal against the fluid passage between the inlet chamber and the control chamber of the valve, and also causes the float member of the gas operated valve to press the closure membrane to seal against the outlet aperture of the gas operated valve, so that air entering the inlet of the valve does not flow out the outlet aperture of the gas operated valve and fluid entering the inlet can flow out of the liquid outlet port;
[0025] In FIG. 4, fluid has entered the control chamber above the rolling membrane, so that the pressure in the control chamber is the same as the pressure in the inlet chamber; due to differences in area the pressure responsive closing mechanism starts to descend. The movable seal of the closing system still seals against the fluid passage between the inlet chamber and the control chamber of the valve. This slows the descending movement of the plunger assembly of the pressure responsive closing mechanism;
[0026] In FIG. 5, the plunger assembly of the pressure responsive closing mechanism has finished its descent and seals the inlet of the valve; as soon as fluid cannot flow anymore to the liquid outlet port, the seal immediately drops to open the fluid passage and the valve is ready for air to enter the valve inlet and return to the configuration of FIG. 2; and
[0027] In FIG. 6, after having returned to the configuration of FIG. 2, gas (air) entering the valve inlet creates negative pressure in the control chamber, which causes the plunger assembly of the pressure responsive closing mechanism to rise; this causes air to enter the outlet aperture of the gas operated valve into the rest of the valve and purge out liquid from the valve to the liquid line or liquid outlet port.
DETAILED DESCRIPTION OF EMBODIMENTS
[0028] Reference is now made to FIG. 2, which illustrates a controlled closing system for a hydraulic valve liquid discharge valve, constructed and operative in accordance with a non-limiting embodiment of the present invention. For ease of understanding, the description follows for the valve 10 of FIGS. 1A-1B; like elements are designated by like reference numerals. However, the invention is not limited to this valve and can be carried out with other hydraulic valves.
[0029] In the prior art, the restricted fluid passage 54 is always open. In contrast to the prior art, in the present invention, the restricted fluid passage 54 is not always open. Instead, a controlled closing system is provided that controls opening and closing of fluid passage 54, as is described below.
[0030] In one embodiment of the invention, the controlled closing system includes a seal 60 movable with respect to and sealable against an opening 62 of fluid passage 54, the opening 62 facing inlet 22. The opening 62 may be the lower opening of the fluid passage 54, or alternatively as in the illustrated embodiment, the opening 62 is at the lower end of a tube 64 mounted in the existing fluid passage 54, so that tube 64 becomes the fluid passage of the system of the invention.
[0031] Seal 60 may be spherical as shown, or alternatively may be oblong, ellipsoid or other shapes. Seal 60 is free to move axially (up and down) in a bore 66 of a seal housing 68. Seal 60 is preferably denser than the liquid entering the inlet 22.
[0032] The operation of the system is now described with reference to FIGS. 2-6.
[0033] In FIG. 2, the movable seal 60 does not seal against the fluid passage (that is, either the tube 64 or the fluid passage 54), which is between inlet chamber 40 and control chamber 46. The plunger assembly 70 of the pressure responsive closing mechanism 34 seals against the inlet 22 of valve 10. The float member 108 of gas operated valve 48 does not press closure membrane 100 to seal against outlet aperture 96 of gas operated valve 48, so that air entering the inlet 22 of the valve 10 can rise and flow past (around) seal 60 through the fluid passage 64 (or 54) between the inlet chamber 40 and the control chamber 46, flow past the float member 108 and flow out the outlet aperture 96 of the gas operated valve 48 to the outside environment.
[0034] In FIG. 3, the pressure in the inlet chamber 40 is greater than the atmospheric pressure which is the pressure in the control chamber 46. This pressure difference causes the plunger assembly 70 of the pressure responsive closing mechanism 34 to rise and allow liquid (water) and gas (air) to enter the inlet 22, which causes the movable seal 60 of the closing system to rise and seal against the fluid passage 64 (or 54) between the inlet chamber 40 and the control chamber 46 of the valve 10. This also causes the float member 108 of the gas operated valve 48 to press the closure membrane 100 to seal against the outlet aperture 96 of the gas operated valve 48, so that air entering the inlet 22 of the valve 10 does not flow out the outlet aperture 96 of the gas operated valve 48 and fluid entering the inlet 22 can flow out of the liquid outlet port 26.
[0035] In FIG. 4, fluid has entered the control chamber 46 above the rolling membrane 74, so that the pressure in the control chamber 46 is the same pressure in the inlet chamber 40. However, the area above the membrane 74 is greater than the area below the membrane 74. This difference in area causes the plunger assembly 70 of the pressure responsive closing mechanism 34 to descend. The movable seal 60 of the closing system still seals against the fluid passage 64 (or 54) between the inlet chamber 40 and the control chamber 46 of the valve 10. In contrast with the prior art, this slows the descending movement of the plunger assembly 70 of the pressure responsive closing mechanism 34.
[0036] In FIG. 5, the plunger assembly 70 of the pressure responsive closing mechanism 34 has finished its descent and seals the inlet 22 of the valve 10. As soon as fluid cannot flow anymore to the liquid outlet port 26, the seal 60 immediately drops to open the fluid passage 64 (or 54) and the valve 10 is ready for air to enter the valve inlet 22 and return to the configuration of FIG. 2.
[0037] Thus, the movable seal 60 of the closing system provides a slower and more controlled closure of the fluid passage between the inlet chamber 40 and the control chamber 46 and yet provides an immediate response to closure of the valve inlet 22 to return to the initial operative configuration.
[0038] In FIG. 6, after having returned to the configuration of FIG. 2, gas (air) entering the valve inlet 22 creates negative pressure in the control chamber 46, which causes the plunger assembly 70 of the pressure responsive closing mechanism 34 to rise. This causes air to enter the outlet aperture 96 of the gas operated valve towards control chamber 46 into the rest of the valve and purge out liquid from the valve to the liquid line or liquid outlet port 26.
