Pneumatic stop valve

Abstract

The utility model discloses a pneumatic stop valve which comprises a valve body, a valve cover, a valve rod, a pneumatic actuator and a valve clack, the valve cover is installed at the upper end of the valve body, and the valve rod penetrates through the valve cover and extends into the valve body to be in linkage connection with the valve clack. The valve clack comprises a valve clack body, a valve clack sealing ring and a plurality of elastic locking assemblies, an annular groove is formed in the periphery of the lower end of the valve clack body, the elastic locking assemblies are installed in the annular groove in the circumferential direction, the valve clack sealing ring is embedded in the annular groove, and a plurality of locking grooves with the number equal to that of the elastic locking assemblies are formed in the inner periphery of the valve clack sealing ring. The locking groove comprises a vertical sliding groove section extending in the axial direction from the upper end of the valve clack, a horizontal sliding groove section extending in the circumferential direction from the lower end of the vertical sliding groove section and an axial limiting groove formed in the tail end of the horizontal sliding groove section, and when the elastic locking assembly is matched with the axial limiting groove, the valve clack sealing ring cannot be disengaged from the annular groove in the axial direction. When the valve clack sealing ring is replaced, other tools are not needed, and maintenance operation in the later period is greatly facilitated.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a pneumatic shut-off valve. Background Technology

[0002] The closing principle of a gate valve is to rely on the axial pressure of the valve stem to make the valve disc sealing surface and the valve seat sealing surface fit tightly together, preventing the medium from flowing upward. However, this structure is a forced sealing structure, so when the valve is closed, pressure must be applied to the valve disc to force the sealing surface to not leak.

[0003] Currently, the valve disc of a gate valve is usually a single unit. For example, patent application CN202110262350.5 discloses a pneumatic gate valve where the valve disc is an independent part. Because the valve disc sealing surface is frequently subjected to erosion by the medium and impacts the valve seat during sealing, the valve disc is a consumable part that needs periodic replacement. Replacing the entire valve disc is wasteful and costly. Patent application CN201310406556.6 discloses a gate valve with a replaceable sealing surface, resulting in lower maintenance costs. In this structure, a valve disc sealing surface cover is screwed onto the lower surface of the valve disc, pressing the sealing surface tightly. This allows for easy replacement of the valve disc sealing surface. However, this structure requires a wrench to remove the screws, which is time-consuming and laborious, especially when a suitable wrench is unavailable. Therefore, it is necessary to design a gate valve that is easier to maintain to solve these problems. Utility Model Content

[0004] The purpose of this utility model is to provide a pneumatic shut-off valve. This utility model eliminates the need for other tools when replacing the valve disc sealing ring, greatly facilitating subsequent maintenance operations.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pneumatic shut-off valve, comprising a valve body, a valve cover, a valve stem, a pneumatic actuator, and a valve disc. The valve cover is mounted on the upper end of the valve body, and the valve stem passes through the valve cover and extends into the valve body to be linked with the valve disc. The valve body also provides a valve seat that forms a sealing fit with the valve disc when the valve is closed. A bracket is provided on the valve cover, and the pneumatic actuator is mounted on the bracket. The output end of the pneumatic actuator is linked with the upper end of the valve stem. The valve disc includes a valve disc body, a valve disc sealing ring, and multiple sets of elastic... The locking assembly includes an annular groove on the lower outer periphery of the valve disc body. Multiple sets of elastic locking assemblies are installed circumferentially in the annular groove. The valve disc sealing ring is embedded in the annular groove, and the inner periphery of the valve disc sealing ring is provided with multiple locking grooves, the number of which is equivalent to the number of elastic locking assemblies. The locking groove includes a vertical sliding groove section extending axially from the upper end of the valve disc, a horizontal sliding groove section extending circumferentially from the lower end of the vertical sliding groove section, and an axial limiting groove provided at the end of the horizontal sliding groove section. When the elastic locking assembly cooperates with the axial limiting groove, the valve disc sealing ring cannot disengage from the annular groove axially.

[0006] By adopting the above technical solution, when the valve disc sealing ring needs to be replaced, the locking groove on the valve disc sealing ring is aligned with the elastic locking component on the valve disc body. The valve disc sealing ring is then pushed axially and rotated. The elastic locking component on the valve disc body engages with the axial limiting groove on the valve disc sealing ring, preventing the valve disc sealing ring from disengaging axially from the annular groove. These two steps complete the installation of the valve disc sealing ring. When the valve disc sealing ring needs to be removed, simply reverse the valve disc sealing ring forcefully, disengaging the elastic locking component from the axial limiting groove, and then pull out the valve disc sealing ring. The installation and removal operations are very convenient, requiring no additional tools, greatly simplifying subsequent maintenance.

[0007] The present invention is further configured such that the elastic locking assembly includes a spring and a locking ball, the valve disc body is provided with multiple sets of inner holes and outer holes at the position corresponding to the circumference of the annular groove, the inner holes and outer holes in the same set are coaxially arranged, and the inner diameter of the inner hole is larger than the inner diameter of the outer hole, a limiting step is formed between the inner hole and the outer hole, the locking ball is slidably disposed in the inner hole and the outer hole along the axial direction, and the spring is disposed in the inner hole and applies an outward preload to the locking ball, the outer periphery of the locking ball is provided with a limiting protrusion for forming a travel limiting with the limiting step, and the outer end of the locking ball is provided with a hemispherical locking part, the radius of the hemispherical locking part is not greater than the depth of the axial limiting groove.

[0008] By adopting the above technical solution, the elastic locking structure formed by the locking ball and the spring can expand and contract under the action of external force, and the structure is stable and reliable.

[0009] The present invention is further configured such that an O-ring is installed on the inner circumference of the valve disc sealing ring for forming a sealing fit with the circumference of the annular groove.

[0010] By adopting the above technical solution, reliable sealing between the valve disc sealing ring and the valve disc body can be guaranteed, preventing upstream medium from leaking through the gap between them when the valve is closed.

[0011] The present invention is further configured such that the bottom of the valve disc body is provided with a threaded groove, the inner hole is connected to the threaded groove, a limit retaining ring is threadedly connected in the threaded groove, a washer is also provided in the inner hole, the two ends of the spring are respectively abutted against the washer and the locking ball, and the end of the washer away from the spring abuts against the periphery of the limit retaining ring.

[0012] By adopting the above technical solution, it is not only convenient to install the locking tumbler and the spring, but also because the washer protects the spring, the spring will not be scratched by the threads of the limit retaining ring when the limit retaining ring is disassembled or installed.

[0013] The present invention is further provided that the locking tumbler and the washer are respectively provided with a first positioning groove and a second positioning groove for the two ends of the spring to be embedded.

[0014] By adopting the above technical solution, it can be ensured that the spring will not deform off the central axis, thereby protecting the spring and extending its service life.

[0015] The present invention is further configured such that an elastic pad for abutting against the upper end of the threaded groove is installed on the upper end of the limiting retaining ring.

[0016] By adopting the above technical solution, when tightening the retaining ring, the elastic pad can provide a reverse preload force to the retaining ring, thereby increasing the thread friction between the retaining ring and the thread groove, which can prevent the retaining ring from loosening.

[0017] The present invention is further configured such that multiple actuating plates are distributed in a circular array on the inner circumference of the limiting ring.

[0018] By adopting the above technical solution, the actuating plate can provide a force point for the operator's fingers, making it easier for the operator to rotate the limit stop ring.

[0019] The present invention is further configured such that the upper end of the valve disc body is provided with a connecting groove, the lower end of the valve stem extends into the connecting groove, and an annular retaining groove is provided on the outer periphery of the part of the valve stem extending into the connecting groove. A split ring is engaged in the annular retaining groove, and a pressure sleeve is threadedly connected to the upper end of the valve disc body corresponding to the connecting groove. The pressure sleeve abuts against the upper end of the split ring and restricts it in the connecting groove.

[0020] By adopting the above technical solution, the connection structure between the valve stem and the valve disc body is simple and reliable, and disassembly and assembly are very convenient. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the connection structure between the valve disc and the valve stem of this utility model;

[0023] Figure 3 This is a schematic diagram of the valve disc body of this utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the valve disc sealing ring of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the limiting retaining ring of this utility model.

[0026] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve stem; 4. Pneumatic actuator; 5. Valve disc; 6. Valve seat; 7. Bracket; 8. Valve disc body; 9. Valve disc sealing ring; 10. Elastic locking assembly; 11. Annular groove; 12. Locking groove; 13. Vertical sliding groove section; 14. Horizontal sliding groove section; 15. Axial limiting groove; 16. Spring; 17. Locking tumbler; 18. Inner hole; 19. Outer hole; 20. Limiting step; 21. Limiting protrusion; 22. Hemispherical locking part; 23. O-ring; 24. Threaded groove; 25. Limiting retaining ring; 26. Washer; 27. First positioning groove; 28. Second positioning groove; 29. ​​Elastic pad; 30. Actuating plate; 31. Connecting groove; 32. Annular retaining groove; 33. Split ring; 34. Pressure sleeve. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example: As attached Figures 1-5The pneumatic shut-off valve shown includes a valve body 1, a valve cover 2, a valve stem 3, a pneumatic actuator 4, and a valve disc 5. The valve cover 2 is bolted to the upper end of the valve body 1. The valve stem 3 passes through the valve cover 2 and extends into the valve body 1, where it is linked with the valve disc 5. The valve body 1 also contains a valve seat 6, which forms a sealing fit with the valve disc 5 when the valve is closed. The valve seat 6 and the valve body 1 are integrally formed. A bracket 7 is provided on the valve cover 2, and the pneumatic actuator 4 is mounted on the bracket 7. The output end of the pneumatic actuator 4 is linked with the upper end of the valve stem 3. The valve disc 5 includes a valve disc body 8, a valve disc sealing ring 9, and multiple sets of elastic locking components 10. The lower outer periphery of the valve disc body 8 is provided with an annular groove 11. Multiple sets of elastic locking components 10 are installed circumferentially in the annular groove 11. The valve disc sealing ring 9 is embedded in the annular groove 11, and the inner periphery of the valve disc sealing ring 9 is provided with multiple locking grooves 12, the number of which is equivalent to that of the elastic locking components 10. The locking groove 12 includes a vertical sliding groove section 13 extending axially from the upper end of the valve disc 5, a horizontal sliding groove section 14 extending circumferentially from the lower end of the vertical sliding groove section 13, and an axial limiting groove 15 provided at the end of the horizontal sliding groove section 14. When the elastic locking component 10 cooperates with the axial limiting groove 15, the valve disc sealing ring 9 cannot disengage from the annular groove 11 axially. When the valve disc seal ring 9 needs to be replaced, align the locking groove 12 on the valve disc seal ring 9 with the elastic locking component 10 on the valve disc body 8. Push the valve disc seal ring 9 axially, then rotate it. The elastic locking component 10 on the valve disc body 8 engages with the axial limiting groove 15 on the valve disc seal ring 9, preventing the valve disc seal ring 9 from detaching axially from the annular groove 11. These two steps complete the installation of the valve disc seal ring 9. When the valve disc seal ring 9 needs to be removed, simply reverse the valve disc seal ring 9 forcefully, disengaging the elastic locking component 10 from the axial limiting groove 15, and then pull out the valve disc seal ring 9. The installation and removal operations are very convenient, requiring no additional tools, greatly simplifying future maintenance.

[0029] As attached Figures 2-4As shown, the elastic locking assembly 10 includes a spring 16 and a locking pin 17. The valve body 8 is provided with multiple sets of inner holes 18 and outer holes 19 on the periphery of the annular groove 11. The inner holes 18 and outer holes 19 in the same set are coaxially arranged, and the inner diameter of the inner hole 18 is larger than the inner diameter of the outer hole 19. A limiting step 20 is formed between the inner hole 18 and the outer hole 19. The locking pin 17 is slidably disposed in the inner hole 18 and the outer hole 19 along the axial direction. The spring 16 is disposed in the inner hole 18 and applies an outward preload to the locking pin 17. The outer periphery of the locking pin 17 is provided with a limiting protrusion 21 for forming a travel limit with the limiting step 20. The outer end of the locking pin 17 is provided with a hemispherical locking part 22. The radius of the hemispherical locking part 22 is not greater than the depth of the axial limiting groove 15. In this embodiment, the vertical sliding groove section 13 and the horizontal sliding groove section 14 have the same depth and are less than the depth of the axial limiting groove 15. The elastic locking structure formed by the locking pin 17 and the spring 16 can extend and retract under the action of external force, and the structure is stable and reliable.

[0030] As attached Figure 2 As shown, an O-ring 23 is installed on the inner circumference of the valve disc sealing ring 9 to form a sealing fit with the circumference of the annular groove 11. This design ensures reliable sealing between the valve disc sealing ring 9 and the valve disc body 8, preventing upstream medium from leaking through the gap between them when the valve is closed.

[0031] As attached Figures 2-5 As shown, the valve disc body 8 has a threaded groove 24 at its bottom, and the inner hole 18 communicates with the threaded groove 24. A limit retaining ring 25 is threadedly connected inside the threaded groove 24, and a washer 26 is also provided inside the inner hole 18. The two ends of the spring 16 abut against the washer 26 and the locking tumbler 17, respectively, and the end of the washer 26 away from the spring 16 abuts against the circumference of the limit retaining ring 25. This design not only facilitates the installation of the locking tumbler 17 and the spring 16, but also, due to the protection of the spring 16 by the washer 26, the spring 16 will not be scratched by the threads of the limit retaining ring 25 when it is installed or removed.

[0032] As attached Figure 2 As shown, the locking tumbler 17 and the washer 26 are respectively provided with a first positioning groove 27 and a second positioning groove 28 for the two ends of the spring 16 to be inserted into. This design can ensure that the spring 16 will not deform off the central axis, thereby protecting the spring 16 and extending its service life.

[0033] As attached Figure 2As shown, an elastic pad 29, which is abutting against the upper end of the threaded groove 24, is installed on the upper end of the retaining ring 25. The elastic pad 29 is a silicone pad or a rubber pad, which is glued to the upper end of the retaining ring 25. When the retaining ring 25 is tightened, the elastic pad 29 can provide a reverse preload force on the retaining ring 25, thereby increasing the thread friction between the retaining ring 25 and the threaded groove 24, thus preventing the retaining ring 25 from loosening.

[0034] As attached Figure 2 and attached Figure 5 As shown, the inner circumference of the limiting retaining ring 25 has multiple actuating pieces 30 arranged in a circular array. The actuating pieces 30 and the limiting retaining ring 25 can be an integral structure or welded to the inner side of the limiting retaining ring 25. The actuating pieces 30 can provide a force point for the operator's fingers, making it easier for the operator to rotate the limiting retaining ring 25.

[0035] As attached Figure 2 As shown, the upper end of the valve disc body 8 is provided with a connecting groove 31, the lower end of the valve stem 3 extends into the connecting groove 31, and the outer periphery of the part of the valve stem 3 extending into the connecting groove 31 is provided with an annular retaining groove 32. A split ring 33 is engaged in the annular retaining groove 32. A pressure sleeve 34 is also threadedly connected to the upper end of the valve disc body 8 corresponding to the connecting groove 31. The pressure sleeve 34 abuts against the upper end of the split ring 33, restricting it in the connecting groove 31. The connection structure between the valve stem 3 and the valve disc body 8 is simple and reliable, and disassembly and assembly are very convenient.

Claims

1. A pneumatic shut-off valve, comprising a valve body (1), a valve cover (2), a valve stem (3), a pneumatic actuator (4), and a valve disc (5), wherein the valve cover (2) is mounted on the upper end of the valve body (1), the valve stem (3) penetrates the valve cover (2) and extends into the valve body (1) to be linked with the valve disc (5), the valve body (1) is also provided with a valve seat (6) that forms a sealing fit with the valve disc (5) when the valve is closed, a bracket (7) is provided on the valve cover (2), the pneumatic actuator (4) is mounted on the bracket (7), and the output end of the pneumatic actuator (4) is linked with the upper end of the valve stem (3); characterized in that: The valve disc (5) includes a valve disc body (8), a valve disc sealing ring (9), and multiple sets of elastic locking components (10). The lower outer periphery of the valve disc body (8) is provided with an annular groove (11). Multiple sets of elastic locking components (10) are installed in the annular groove (11) along the circumferential direction. The valve disc sealing ring (9) is embedded in the annular groove (11). The valve disc sealing ring (9) is provided with multiple locking grooves (12) with a number equivalent to the number of elastic locking components (10) on its inner periphery. The locking groove (12) includes a vertical sliding groove section (13) extending axially from the upper end of the valve disc (5), a horizontal sliding groove section (14) extending circumferentially from the lower end of the vertical sliding groove section (13), and an axial limiting groove (15) provided at the end of the horizontal sliding groove section (14). When the elastic locking component (10) cooperates with the axial limiting groove (15), the valve disc sealing ring (9) cannot disengage from the annular groove (11) along the axial direction.

2. The pneumatic shut-off valve according to claim 1, characterized in that: The elastic locking assembly (10) includes a spring (16) and a locking pin (17). The valve body (8) is provided with multiple sets of inner holes (18) and outer holes (19) on the periphery of the annular groove (11). The inner holes (18) and outer holes (19) in the same set are coaxially arranged, and the inner diameter of the inner hole (18) is larger than the inner diameter of the outer hole (19). A limiting step (20) is formed between the inner hole (18) and the outer hole (19). The locking pin (17) is axially... The spring (16) is slidably disposed in the inner hole (18) and the outer hole (19), and is disposed in the inner hole (18) and applies an outward preload force to the locking ball (17). The outer periphery of the locking ball (17) is provided with a limiting protrusion (21) for forming a travel limit with the limiting step (20). The outer end of the locking ball (17) is provided with a hemispherical locking part (22), and the radius of the hemispherical locking part (22) is not greater than the depth of the axial limiting groove (15).

3. The pneumatic shut-off valve according to claim 2, characterized in that: The valve disc sealing ring (9) is equipped with an O-ring (23) on its inner circumference for forming a sealing fit with the circumference of the annular groove (11).

4. The pneumatic shut-off valve according to claim 2, characterized in that: The valve body (8) has a threaded groove (24) at the bottom. The inner hole (18) is connected to the threaded groove (24). A limit ring (25) is threadedly connected in the threaded groove (24). A washer (26) is also provided in the inner hole (18). The two ends of the spring (16) are respectively pressed against the washer (26) and the locking ball (17). The end of the washer (26) away from the spring (16) is in contact with the periphery of the limit ring (25).

5. The pneumatic shut-off valve according to claim 4, characterized in that: The locking tumbler (17) and the washer (26) are respectively provided with a first positioning groove (27) and a second positioning groove (28) for the two ends of the spring (16) to be embedded.

6. The pneumatic shut-off valve according to claim 4, characterized in that: The upper end of the limiting retaining ring (25) is fitted with an elastic pad (29) for abutting against the upper end of the threaded groove (24).

7. The pneumatic shut-off valve according to claim 4, characterized in that: The inner circumference of the limiting ring (25) is arranged in a circular array with multiple toggle pieces (30).

8. The pneumatic shut-off valve according to claim 1, characterized in that: The upper end of the valve disc body (8) is provided with a connecting groove (31), the lower end of the valve stem (3) extends into the connecting groove (31), and the outer periphery of the part of the valve stem (3) extending into the connecting groove (31) is provided with an annular groove (32). A split ring (33) is engaged on the annular groove (32). A pressure sleeve (34) is also threadedly connected to the upper end of the valve disc body (8) corresponding to the connecting groove (31). The pressure sleeve (34) abuts against the upper end of the split ring (33) and restricts it in the connecting groove (31).

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