SLIDE GATE VALVE, OPERATING METHOD AND USE

Abstract

A slide gate valve for chemical and/or petrochemical industrial plants, the valve including a valve housing including an inlet port having an exit opening and an outlet port having an entry opening, which correspond with each other when the slide gate valve is in an open position; a blocking device having at least one blocking disc and having a pipe bridge, which is movably arranged between the inlet and outlet ports in order to open and close the valve; and at least one guiding device for guiding flow, wherein the guiding device has at least one guiding element, which is located on an inner wall of the inlet port and reduces the exit opening of the inlet port such that, as the slide gate valve is opened, an opening cross section of the exit opening is enlarged at the moment of an initial, flow ingress into the pipe bridge.

Claims

1-23. (canceled)

24. A slide gate valve for chemical and/or petrochemical industrial plants comprising: a valve housing having an inlet port with an exit opening and an outlet port with an entry opening, which correspond with one another in an open position of the slide gate valve; a blocking device with at least one blocking disc and a pipe bridge that is arranged so as to be movable between the inlet port and the outlet port in order to open and close the slide gate valve; and at least one guiding device for guiding a flow, wherein the guiding device has at least one guiding element that is arranged on an inner wall of the inlet port and reduces the exit opening of the inlet port in such a way that, as the slide gate valve is opened, an opening cross section of the exit opening is enlarged at a moment of an initial flow ingress into the pipe bridge.

25. The slide gate valve according to claim 24, wherein the guiding element is designed in such a way that the exit opening of the inlet port can be unblocked or is unblocked in a delayed manner in relation to the entry opening of the exit port as the slide gate valve is opened.

26. The slide gate valve according to claim 24, wherein the guiding element is adapted in such a way that the opening cross section forms at least one gap between the pipe bridge and the inlet port at the moment of the initial flow ingress from the inlet port into the pipe bridge.

27. The slide gate valve according to claim 26, wherein the guiding element is adapted in such a way that the gap is sectionally arcuate and sectionally linear.

28. The slide gate valve according to claim 24, wherein the guiding element has on the exit opening of the inlet port at least one outer contour that extends transverse to an opening direction and a closing direction of the slide gate valve.

29. The slide gate valve according to claim 28, wherein the at least one outer contour has a straight outer edge or a curved outer edge.

30. The slide gate valve according to claim 24, wherein the guiding element has a surface that is straight and protrudes into the inlet port with increasing distance from the inner wall along a flow direction or bulges into an interior of the inlet port starting from the inner wall.

31. The slide gate valve according to claim 24, wherein the guiding element has a triangular cross section or forms a triangular cross section together with the inner wall.

32. The slide gate valve according to claim 31, wherein the triangular cross section extends along a width of the guiding element.

33. The slide gate valve according to claim 24, wherein a drainage gap is formed between the guiding element and the inner wall.

34. The slide gate valve according to claim 28, wherein the at least one outer contour extends inward transverse to a longitudinal direction of the inlet port starting from the inner wall.

35. The slide gate valve according to claim 24, wherein the guiding element is designed so as to ascend in a flow direction toward the exit opening of the inlet port.

36. The slide gate valve according to claim 24, wherein the guiding element at least partially extends in a longitudinal direction of the inlet port and ends at the exit opening of the inlet port.

37. The slide gate valve according to claim 24, wherein the inlet port and the outlet port respectively have a seal seat for the at least one blocking disc, wherein the guiding element is at least sectionally offset inward in relation to the seal seat of the outlet port transverse to a longitudinal direction.

38. The slide gate valve according to claim 24, wherein an opening cross section of the entry opening of the outlet port is larger than the opening cross section of the exit opening of the inlet port as the slide gate valve is opened and/or in the open position of the slide gate valve.

39. The slide gate valve according to claim 24, wherein the at least one guiding device has an additional guiding element that is arranged between the at least one blocking disc and the pipe bridge in a direction of displacement of the blocking device, wherein the additional guiding element forms a flow channel that extends transverse to the direction of displacement and connects the inlet port to the outlet port at least when the slide gate valve is opened.

40. A slide gate valve for chemical and/or petrochemical industrial plants comprising: a valve housing having an inlet port with an exit opening and an outlet port with an entry opening, which correspond with one another in an open position of the slide gate valve; a blocking device with at least one blocking disc and a pipe bridge that is arranged so as to be movable between the inlet port and the outlet port in order to open and close the slide gate valve; and at least one guiding device for guiding the flow, wherein the guiding device has at least one guiding element that is arranged between the at least one blocking disc and the pipe bridge in a direction of displacement of the blocking device, wherein the at least one guiding element forms a flow channel that extends transverse to the direction of displacement and connects the inlet port to the outlet port at least when the slide gate valve is opened.

41. The slide gate valve according to claim 40, wherein the at least one guiding element is integrated into the blocking device, wherein the flow channel extends through the entire blocking device transverse to the direction of displacement.

42. The slide gate valve according to claim 40, wherein the at least one guiding element is formed by at least one pipe section.

43. A method for operating the slide gate valve according to claim 24, wherein the pipe bridge has a passageway, which in the open position is arranged in such a way that the inlet port with the exit opening and the outlet port with the entry opening are connected to one another by the passageway of the pipe bridge, wherein the blocking device is in a closed position arranged in such a way that the inlet port and the outlet port are blocked off from one another by the at least one blocking disc.

44. The method according to claim 43, wherein the opening cross section of the exit opening of the inlet port is unblocked linearly over an entire displacement path of the blocking device as the slide gate valve is opened.

45. A method for operating the slide gate valve according to claim 40, wherein the pipe bridge includes a passageway, which in the open position is arranged in such a way that the inlet port with the exit opening and the outlet port with the entry opening are connected to one another by the passageway of the pipe bridge, wherein the blocking device is in a closed position arranged in such a way that the inlet port and the outlet port are blocked off from one another by the at least one blocking disc.

46. The use of the slide gate valve according to claim 24 in a coking process and/or cracking process.

Description

DESCRIPTION OF DRAWINGS

[0069] The invention is described in greater detail below with reference to the attached drawings. The embodiments illustrated in the drawings represent exemplary designs of the inventive slide gate valve.

[0070] In these drawings,

[0071] FIG. 1 shows a longitudinal section through a slide gate valve according to a preferred exemplary embodiment of the invention, wherein a blocking device of the slide gate valve is in a closed position;

[0072] FIG. 2 shows a perspective detail of an inlet port with a guiding device of the slide gate valve according to FIG. 1;

[0073] FIG. 3 shows a longitudinal section through the slide gate valve according to FIG. 1, wherein the blocking device of the slide gate valve is in a position, in which only the entry opening of the outlet port of the slide gate valve is connected to the passageway of the pipe bridge;

[0074] FIG. 4 shows a perspective detail of the inlet port and the guiding device of the slide gate valve according to FIG. 1, wherein an opening cross section of the exit opening of the inlet port is illustrated in the position according to FIG. 3;

[0075] FIG. 5 shows a schematic representation for illustrating the opening cross section of the exit opening of the inlet port in the position according to FIG. 3, which shows the moment of the first flow ingress into the pipe bridge;

[0076] FIG. 6 shows a longitudinal section through the slide gate valve according to FIG. 1, wherein the blocking device of the slide gate valve is moved farther in the direction of the open position;

[0077] FIG. 7 shows a perspective detail of the inlet port and the guiding device of the slide gate valve according to FIG. 1, wherein the opening cross section of the exit opening of the inlet port is additionally enlarged;

[0078] FIG. 8 shows a diagram for illustrating the opening phase of the exit opening of the inlet port of the slide gate valve according to FIG. 1;

[0079] FIG. 9 shows a top view of a slide gate valve according to another exemplary embodiment of the invention; and

[0080] FIG. 10 shows a perspective and partially transparent view of a blocking device of the slide gate valve according to FIG. 9.

[0081] FIG. 11 shows a top view of a slide gate valve in the region of the inlet port according to another exemplary embodiment of the invention, in which the guiding element has a straight outer edge;

[0082] FIG. 12 shows a perspective view of the slide gate valve according to FIG. 11 in the region of the inlet port;

[0083] FIG. 13 shows a section through the inlet port of the slide gate valve according to FIG. 11;

[0084] FIG. 14 shows a perspective view of the sectioned inlet port according to FIG. 13 and the associated sectioned outlet port, and

[0085] FIG. 15 shows a schematic representation for illustrating the opening cross section of the exit opening of the inlet port according to FIG. 11 in a position at the moment of the first flow ingress into the pipe bridge.

DESCRIPTION OF AN EMBODIMENT

[0086] Identical and identically acting components are identified by the same reference symbols in the following description.

[0087] FIGS. 1 to 7 show a slide gate valve 10 according to a preferred exemplary embodiment of the invention, wherein the slide gate valve 10 is a double-disc gate valve.

[0088] The slide gate valve 10 has a valve housing 11 that encloses the components located in the valve housing 11 in a fluid-tight manner. The valve housing 11 has an inlet port 12 and an outlet port 14. The inlet and outlet ports 12, 14 are respectively realized in the form of pipe sockets. The inlet and outlet ports 12, 14 are in the installed state flanged to corresponding (not-shown) lines such as a transfer line or a decoking line.

[0089] The inlet port 12 has an exit opening 13 and the outlet port 14 has an entry opening 15, which correspond with one another in an open position of the slide gate valve 10. The inlet and outlet ports 12, 14 lie on a common longitudinal axis.

[0090] The slide gate valve 10 furthermore has a blocking device 16 that comprises two blocking discs 17 and a pipe bridge 18. The blocking discs 17 are placed into a disc basket 34. The blocking discs 17 are arranged concentrically and parallel to one another and block the inlet and outlet ports 12, 14 in a closed position. The blocking discs 17 are placed into the disc basket 34 loosely such that they are movable in the axial direction, i.e. perpendicular to the surface of the blocking discs 17. In other words, the blocking device 16 can be displaced transverse to the longitudinal axis of the ports 12, 14. This is used for pressing the blocking discs 17 against the housing seal seats 29 provided on the valve housing 11 in the closed position. To this end, a spreading member 35 is arranged between the two blocking discs 17 and connected to a slide rod 36. The slide rod 36 is mounted in the valve housing 11 in a fluid-tight manner and can be moved in the longitudinal direction by a (not-shown) drive. The spreading member 35 has an inner wedge 37 that is arranged in an outer wedge 38 on the inner side of the blocking discs 17. A centering ball 39 is arranged between jaws of the inner wedge 37 in order to center the spreading member 35.

[0091] The pipe bridge 18 is rigidly connected to the disc basket 34. In other words, the pipe bridge 18 is arranged on the disc basket 34 on a side that lies opposite of the slide rod 36. The pipe bridge 18 has a passageway 26 that is aligned with the inlet and outlet ports 12, 14 in the open position. The pipe bridge 18 is connected to the disc basket 34 in such a way that it can be moved into the open or closed position together with the disc basket 34 by actuating the slide rod 36. To this end, the disc basket 34 and the pipe bridge 18 are moved between two parallel guide discs.

[0092] The pipe bridge 18 has a compensator unit 41 that comprises the passageway 26. The compensator unit 41 has two sealing rings 42 that are arranged concentrically and spaced apart from one another in the axial direction. A bellows 43 is arranged between the two sealing rings 42. This bellows is realized with multiple corrugations in the present exemplary embodiment. Single-corrugation bellows are likewise possible, particularly for smaller nominal widths.

[0093] When the slide rod 36 is actuated, the inner wedge 37 is moved into the outer wedge 38 such that the two blocking discs 17 are spread apart from one another. Due to this spreading movement, the two blocking discs 17 are pressed against the housing seal seats 29 such that a sound sealing effect is achieved in the closed position of the slide gate valve 10.

[0094] FIGS. 1, 3 and 6 show an opening process of the slide gate valve 10, during which the blocking device 16 is moved from the closed position into the open position. To this end, the blocking device 16 is arranged so as to be movable between the inlet and outlet ports 12, 14.

[0095] The slide gate valve 10 furthermore comprises a guiding device 19 for guiding an inflowing fluid flow. The guiding device 19 has a guiding element 21 that is arranged on an inner wall 22 of the inlet port 12. Viewed in the direction of displacement of the blocking device 16, the guiding element 21 is arranged on the inner wall 22 of the inlet port 12 on the side of the pipe bridge.

[0096] The inner wall 22 of the inlet port 22 is realized cylindrically. The inner wall 22 of the inlet port 12 has an inner circumference, on which the guiding element 21 abuts.

[0097] According to FIGS. 1, 3 and 6, the guiding element 21 extends in a longitudinal direction of the inlet port 12 and ends at the position of the exit opening 13 of the inlet port 12. The guiding element 21 approximately extends over the entire length of the inlet port 12. The guiding element 21 ascends toward the exit opening 13 of the inlet port 12. In other words, the guiding element 21 is designed such that it extends obliquely into the interior of the inlet port 12 toward the exit opening 13. The guiding element 21 is designed in a ramp-shaped manner toward the exit opening 13 of the inlet port 12. The guiding element 21 has a surface 28 that faces the interior of the inlet port 12. This surface is in contact with the fluid or a fluid flow during the operation of the slide gate valve. The surface 28 ends flush with the inner wall 22 of the inlet port 12. This is clearly visible in FIGS. 2 and 4. The surface 28 covers a region of the inner wall 22.

[0098] FIGS. 2, 4, 5 and 7 furthermore show that the surface 28 of the guiding element 21 is realized in a bulging manner. The guiding element 21 is hump-shaped due to the bulging surface 28. In other words, the guiding element 21 is a laminar element that extends over a region of the inner wall 22 of the inlet port 12. The surface 28 of the guiding element 21 specifically has a convex bulge, which extends into the interior of the inlet port 12, transverse to the longitudinal direction of the inlet port 12. The guiding element 21 is sectionally realized in a shell-shaped manner.

[0099] The guiding element 21 is made of sheet metal. In other words, the guiding element 21 is a guiding sheet. It is also possible to realize the guiding element 21 in the form of a guiding plate. A guiding plate has a greater wall thickness than a guiding sheet. Alternatively, the guiding element 21 may be made of a solid material that completely fills out a space between the surface 28 and the inner wall 22 of the inlet port 12.

[0100] The guiding element 21 ends in the longitudinal direction at the position of the exit opening 13 of the inlet port 12. At this position, the guiding element 21 has an outer contour 24 that corresponds to an inner contour 25 of the passageway 26 of the pipe bridge 18. The inner contour 25 and the outer contour 24 are arranged adjacent to one another in the longitudinal direction of the inlet port 12. The inlet port 12 has one of the two seal seats 29 at the position of the exit opening 13. Viewed along the common longitudinal axis, the outlet port 14 has the other of the two seal seats 29 at the position of the entry opening 15 opposite of the exit opening 13. Due to the shape of the outer contour 24, the guiding element 21 is offset inward relative to the seal seat 29 of the outlet port 14 and, in particular, the seal seat 29 of the inlet port 12 transverse to the longitudinal direction.

[0101] The outer contour 24 of the guiding element 21 forms an outer edge. The outer contour 24 of the inlet port 12 reflects the inner contour 25 of the passageway 26 of the pipe bridge 18. The inner contour 25 specifically is a circular, particularly perfectly circular, inner circumference of the passageway 26. The outer contour 24 of the guiding element 21 therefore is realized in the shape of a circular arc. The outer contour 24 of the guiding element 21 specifically forms a circular arc segment. The outer contour 24 of the inlet port 12 and the inner contour 24 of the passageway 26 of the pipe bridge 18 have the same curvature radius.

[0102] The outer contour 24 of the guiding element 21 ends on the inner wall with two ends, wherein an intermediate vertex is arranged in the exit opening 13 transverse to the longitudinal direction. The outer contour 24 of the guiding element 21 therefore is realized in a convexly bulging manner.

[0103] The guiding element 21 reduces the exit opening 13 of the inlet port 12 because the outer edge 21 of the guiding element 21 protrudes into the exit opening transverse to the longitudinal direction of the port 12. Due to the specially shaped outer contour 24 of the guiding element 21, which corresponds to the adjacent inner contour 25 of the pipe bridge 18, an opening cross section 23 of the exit opening 13 of the inlet port 12 is enlarged at the moment of the first flow ingress from the inlet port 12 into the passageway 26 of the pipe bridge 18 as the slide gate valve is opened.

[0104] According to FIGS. 4 and 5, the guiding element 21 is realized in such a way that the opening cross section 23 of the exit opening 13 of the inlet port 12 has a cross-sectional shape that deviates from a punctiform cross section at the moment of the first flow ingress from the inlet port 12 into the pipe bridge 28. This corresponds, for example, to an enlarged opening cross section. The opening cross section 23 is linear at the moment of the first flow ingress from the inlet port 12 into the pipe bridge 18. The opening cross section can have a passage area with a greater extent than a punctiform opening at the moment of the first flow ingress from the inlet port into the passageway 26 of the pipe bridge 18. The opening cross section 23 forms a gap at the moment of the first flow ingress from the inlet port 12 into the passageway 26 of the pipe bridge 18. The gap is arcuate. In other words, the gap has an annular shape. The gap may alternatively or additionally be at least sectionally linear.

[0105] The opening cross section 23 of the exit opening 13 of the inlet port 12 is delimited by an inner circumference of the inner wall 22 of the inlet port 12, the outer contour 24 of the guiding element 21 and the inner contour 25 of the passageway 26 of the pipe bridge 18 at the moment of and during the entire opening process. In other words, the inner circumference of the inner wall 22 of the inlet port 12, the outer contour 24 of the guiding element 12 and the inner contour 25 of the passageway 26 of the pipe bridge 18 define the opening cross section 23 of the exit opening 13 of the inlet port 12 into the pipe bridge 18 when the slide gate valve is opened and closed.

[0106] The opening cross section 23 of the exit opening 13 of the inlet port 12 is always smaller than an opening cross section 31 of the entry opening 15 of the outlet port 14 as the slide gate valve 10 is opened and/or in the open position of the slide gate valve 10. This is illustrated as an example in FIG. 3.

[0107] The opening process of the slide gate valve 10 according to FIGS. 1 to 7 is described below.

[0108] When the blocking device 16 is displaced from the closed position into the open position of the slide gate valve 10, a linear, particularly gap-shaped, opening cross section 23 of the exit opening 13 of the inlet port 12 is unblocked at the moment of an initial or first ingress of a fluid flow into the passageway 26 of the pipe bridge 18, wherein said opening cross section is defined by the outer contour 24 of the guiding element 21 and the adjacent inner contour 25 of the passageway 26 of the pipe bridge 18. FIG. 1 shows the slide gate valve 10 in the closed position. FIG. 4 and FIG. 5 show the linear or gap-shaped opening cross section 23 at the moment of the first ingress of the fluid flow into the passageway 26 of the pipe bridge 18.

[0109] Since the passage opening 23 is enlarged in comparison with a punctiform opening, the fluid containing particles flows into the passageway 26 of the pipe bridge 18 such that it is distributed over the opening cross section 23. In this way, the flow speed of the fluid flow is reduced in comparison with a punctiform opening. Furthermore, FIG. 3 and the diagram according to FIG. 8 clearly show that the guiding element 21 in the inlet port 12 causes the exit opening 13 to be unblocked in a delayed manner in relation to the entry opening 15 of the outlet port 14. In FIG. 8, the curve K1 represents the area of the opening cross section 32 of the entry opening 15 of the outlet port 14 as a function of the respective stroke position of the blocking device 16 or the slide rod 36. Furthermore, the curve K2 represents the area of the opening cross section 23 of the exit opening 13 of the inlet port 12 as a function of the respective stroke position of the blocking device 16 or the slide rod 36. This clearly shows that a passage opening from the passageway 26 into the outlet port 14 already exists at the moment of the first flow ingress. The fluid flow ingressing in a delayed manner therefore is quickly discharged through the opening cross section 31 of the entry opening 15 of the outlet port 15 without subjecting the seal seat 29 on the outlet port 14 to abrasive stress.

[0110] As an example, FIGS. 6 and 7 show the further opening process of the slide gate valve 10, during which the opening cross section 23 is unblocked continuously, particularly uniformly.

[0111] The displacement path between the open position and the closed position, over which the blocking device 16 is displaced, e.g. during an opening process, corresponds to a total stroke of the blocking device 16, particularly the slide rod 36. In the closed position, the blocking device 16 is arranged at a minimal stroke position whereas the blocking device 16 is in the open position arranged at a maximal stroke position. In other words, the blocking device 16 has in the closed position a stroke of 0 percent of the total stroke and in the open position a stroke of 100 percent of the total stroke.

[0112] The stroke range, in which the opening cross section 23 of the exit opening 13 of the inlet port 12 influences an applied process pressure, may lie between 0 percent and up to 35 percent of the total stroke. This stroke range corresponds to the opening phase of the slide gate valve 10. The opening phase, which includes the moment of the first flow ingress into the pipe bridge 18 through the exit opening 13 of the inlet port 12, may take place at a stroke of the blocking device 16 that lies between 22 percent and 35 percent, particularly between 22 percent and 30 percent, of the total stroke. The moment of the first flow ingress into the pipe bridge 18 through the exit opening 13 of the inlet port 12 preferably occurs at a stroke of the blocking device 16 that lies between 23 percent and 28 percent, particularly between 24 percent and 26 percent, of the total stroke. It is particularly preferred that the moment of the first flow ingress into the pipe bridge 18 through the exit opening 13 of the inlet port 12 occurs at a stroke of 25 percent of the total stroke.

[0113] FIGS. 9 and 10 show another exemplary embodiment of a slide gate valve 10 according to the invention, which differs from the slide gate valve 10 according to FIGS. 1 to 7 with respect to the guiding device 19 for guiding the flow, specifically with respect to the guiding element and the blocking device 16. Only the distinctive characteristics of the slide gate valve 10 according to FIGS. 9 and 10 are described below. All undescribed characteristics of the slide gate valve 10 according to FIGS. 9 and 10 are identical to those of the slide gate valve 10 according to FIGS. 1 to 7.

[0114] The slide gate valve 10 has multiple guiding elements 21 that are arranged between the two blocking discs 17 and the pipe bridge 18 in a direction of displacement of the blocking device 16. The guiding elements 21 respectively form a flow channel 32 that extends transverse to the direction of displacement and connects the inlet port 12 to the outlet port 14 at least when the slide gate valve 10 is opened. The respective flow channel 32 penetrates the blocking device 16 transverse to the direction of displacement of the blocking device 16. In other words, the respective flow channel 32 extends in the longitudinal direction of the inlet and outlet ports 12, 14. According to FIGS. 9 and 10, the slide gate valve 10 has a total of two guiding elements 21 that respectively form a flow channel 32.

[0115] The guiding elements 21 are realized in a tubular manner. The guiding elements 21 specifically are formed by pipe sections that are integrated into the blocking device 16. The guiding elements 21 may alternatively be formed by special section tubes. The guiding elements 21 extend parallel to one another through the blocking device 16. The guiding elements 21 are arranged between the blocking discs 17 and the pipe bridge 18 so as to lie on a common plane.

[0116] FIG. 10 shows that the guiding elements 21 are arranged in a disc basket 34. This means that the guiding elements 21 are moved together with the blocking device 16 during a movement of the blocking device 16 between the open and closed position and vice versa. This has the advantage that, during an opening process of the slide gate valve 10, a fluidic connection between the inlet and outlet ports 12, 14 is produced before an opening cross section 23 of the exit opening 13 of the inlet port 12 into the passageway 26 of the pipe bridge 18 is unblocked. This means that the fluid pressure on the inlet side is already reduced in advance and the dirt deposited on the inlet side is transported to the outlet port 14 through the flow channels. The guiding elements 21 form bypass channels around the passageway 26 of the pipe bridge 18, wherein said bypass channels divert the fluid flow from the inlet port 12 into the outlet port 14 during an opening process before the passage into the passageway 26 of the pipe bridge 18 is unblocked (see FIG. 9). In this way, the fluid flow through the passageway 26 of the pipe bridge 18 contains fewer particles such that the housing seal seat 29 on the outlet side is protected.

[0117] The embodiment according to FIGS. 11 to 17 only differs from the exemplary embodiment according to FIGS. 1 to 7 with respect to the shape of the guiding element 21, as well as a few design details of the guiding element 21. All designs described in connection with the exemplary embodiment according to FIGS. 1 to 7 therefore can be transferred to the exemplary embodiment according to FIGS. 11 to 17 and are disclosed and claimed in connection with the exemplary embodiment according to FIGS. 11 to 17.

[0118] In addition, the combination of the exemplary embodiments according to FIGS. 9, 10 and 11 to 17 is disclosed and claimed.

[0119] According to FIGS. 11 and 12, the slide gate valve 10 has a valve housing 11 with an inlet port 12. The inlet port 12 delimits an exit opening 13 that is aligned with the entry opening 15 of the corresponding outlet port 14.

[0120] A blocking device 16 comprising blocking discs 17 and a pipe bridge 18 is provided for actuating the slide gate valve 10. With respect to details regarding the blocking device 16, we refer to the explanations in connection with the exemplary embodiment according to FIGS. 1 to 7.

[0121] The inlet port 12 has a guiding device 19 with a guiding element 21 on the side of the pipe bridge.

[0122] The difference in relation to the guiding element 21 according to FIGS. 1 to 7 can be seen in that the outer contour 24 of the guiding element 21 according to FIGS. 11 to 15 forms a straight outer edge. It was determined that the flow conditions in the initial phase of the opening process of the slide gate valve 10 are improved by the straight outer edge.

[0123] The geometry of the guiding element 21 is described in greater detail as follows. According to FIG. 12, the straight outer edge practically extends on the same plane as the circumferential delimitation of the exit opening 13. The straight outer edge essentially extends perpendicular to the opening and closing direction of the blocking device 16. This is also quite evident in the schematic representation according to FIG. 15.

[0124] The surface 28 of the guiding element 21 is likewise straight, i.e. not curved.

[0125] The guiding element 21 protrudes into the interior of the inlet port 12 similar to the exemplary embodiment according to FIGS. 1 to 7. In this case, the surface 28 is arranged in an inclined manner referred to the inner wall of the inlet port 12. The distance between the surface 28 and the inner wall of the inlet port 12 increases continuously in the flow direction, i.e. in the direction of the exit opening 13. The distance of the surface 28 from the inner wall of the inlet port 12 is maximal at the straight outer edge. This shape of the guiding element 21 is clearly visible in the cross section according to FIG. 13.

[0126] FIG. 12 furthermore shows that the outer contour 24 of the guiding element 21, specifically the straight outer edge, practically lies at the same height as the exit opening 13. A slight gap between the blocking disc 17 and the outer edge is possible as long as the exit opening 13 is shielded by the guiding element 21 in such a way that a fluid flow is at least largely prevented in the initial phase of the opening process of the slide gate valve 10.

[0127] FIGS. 13 and 14 show the triangular cross section of the guiding element 21. The guiding element 21 is made of solid material, i.e. realized massively, in the example according to FIGS. 13 and 14. The guiding element 21 may alternatively comprise a metal sheet that is connected to the inner wall of the inlet port 12. In this case, the triangular cross section is formed by the inner wall of the inlet port 12 and the guiding sheet. The surface 28 is straight. The triangular cross section of the guiding element 21 therefore extends over its entire width. The surface 28 has the same inclination at all locations.

[0128] FIGS. 13 and 14 show a drainage gap 24 that extends between the rear side of the guiding element 21, i.e. the side facing away from the surface 28, and the inner wall of the inlet port 12. Liquid such as condensate can drain off through the drainage gap 24.

[0129] A fastening means 45, e.g. in the form of a cam, is provided for fastening the guiding element 21 in the inlet port 12, wherein said fastening means connects the guiding element to the inlet port 12 permanently or separably. For example, the guiding element 21 may be welded into the inlet port. The cam is designed in the shape of a hook such that the guiding element 21 can be attached thereto with a corresponding receptacle opening. Other cam shapes are possible. For example, the cam may be designed straight for smaller nominal widths.

[0130] The surface 28 is realized in a wear-resistant manner. To this end, it would be possible, for example, to provide a hard facing on the surface 28 by means of buildup welding.

[0131] The above-described details such as the drainage gap 44, the fastening means 45 and the hard facing are also disclosed and claimed in connection with the guiding element according to FIGS. 1 to 7.

[0132] FIG. 15 shows the shape of the opening cross section 23 in the initial phase of the opening process, namely when the fluidic connection between the inlet port 12 and the outlet port 14 is produced and a partial region of the passage opening 26 of the pipe bridge 18 is unblocked. According to FIG. 15, the opening cross section 23 has a combined linear and arcuate shape. The opening cross section 23 is realized in the form of a gap with the shape of a segment of a circle. The straight side of the opening cross section 23 (chord) is delimited by the straight outer edge of the outer contour 24. The arcuate side (arc) of the opening cross section 23 is defined by the curvature radius 27 of the pipe bridge 18.

[0133] Analogous to the exemplary embodiment according to FIGS. 1 to 7, unblocking of the exit opening 13 is delayed by the guiding element 21 to such an extent that the entry opening 15 of the outlet port 14 is opened to a greater degree than the exit opening 13 of the inlet port 12 before the flow begins to pass through. In addition, the opening cross section is enlarged in comparison with the prior art by the straight outer edge such that the undesirable nozzle effect is reduced in the initial phase of the opening process.

[0134] In this exemplary embodiment, a small opening is in fact formed for a short time during the movement of the inner wall of the disc basket 18 past the straight outer edge. As the movement past the straight outer edge continues, however, the opening cross section widens so quickly that a sufficiently large opening cross section is made available and the undesirable nozzle effect practically is suppressed. In addition, the entry opening 15 of the outlet port 14 already is opened relatively wide before the exit opening 13 of the inlet port 12 is opened such that the fluid ingressing into the pipe bridge 18 is immediately discharged and cannot accumulate in the pipe bridge 18.

[0135] In the initial phase of the opening process of a slide gate valve constructed in accordance with the prior art, i.e. without the invention, the particle flow behaves in such a way that particles accumulate in the pipe bridge during the opening process and relatively few particles enter the outlet port 14 from the pipe bridge 18 with high speed. In contrast, fewer particles are admitted into the pipe bridge 18 if a guiding element 21 according to FIGS. 11 to 15 is provided and shields the exit opening 13 of the inlet port 12 in the initial phase. The particle flow can pass through the entry opening 15, which is opened to a greater degree than the exit opening 13, in a nearly unobstructed manner.

[0136] The same phenomenon can be observed in the fluid flow that backs up significantly in the pipe bridge in a slide gate valve without the invention. Due to the delayed unblocking of the entry opening 13 achieved in the exemplary embodiment of the invention and the resulting flow cross sections of different sizes, the fluid flow can also pass through the blocking device 16 being opened in a nearly unobstructed manner in the initial phase of the opening process.

[0137] In conclusion, it should be noted that the characteristics of the two described exemplary embodiments are not limited to the individual exemplary embodiments, but rather can be freely combined with one another.

LIST OF REFERENCE SYMBOLS

[0138] 10 Slide gate valve [0139] 11 Valve housing [0140] 12 Inlet port [0141] 13 Exit opening [0142] 14 Outlet port [0143] 15 Entry opening [0144] 16 Blocking device [0145] 17 Blocking disc [0146] 18 Pipe bridge [0147] 19 Guiding device [0148] 21 Guiding element [0149] 21 Additional guiding element [0150] 22 Inner wall [0151] 23 Opening cross section of exit opening of inlet port [0152] 24 Outer contour [0153] 25 Inner contour [0154] 26 Passage [0155] 27 Curvature radius [0156] 28 Surface [0157] 29 Seal seat [0158] 31 Opening cross section of entry opening of outlet port [0159] 32 Flow channel [0160] 33 Pipe section [0161] 34 Disc basket [0162] 35 Spreading member [0163] 36 Slide rod [0164] 37 Inner wedge [0165] 38 Outer wedge [0166] 39 Centering ball [0167] 41 Compensator unit [0168] 42 Sealing rings [0169] 43 Bellows [0170] 44 Drainage gap [0171] 45 Fastening means (cam)