Double-sealing anti-scouring stop valve

Abstract

The utility model discloses a double-seal anti-scouring stop valve which comprises a valve body, a valve rod, a valve clack and a valve seat, an inlet flow channel, a middle cavity and an outlet flow channel which are sequentially communicated are arranged in the valve body, the valve rod extends into the middle cavity and is connected with the valve clack, and the valve seat is arranged in the middle cavity. The valve seat comprises a first step part and a second step part which are arranged in the axial direction, a first valve seat sealing part is arranged on the inner edge of the first step part, a second valve seat sealing part is arranged on the inner edge of the second step part, the valve clack comprises a valve clack body and a sealing ring, the sealing ring is in a conical shape and is detachably installed on the valve clack body, and the valve clack body is connected with the sealing ring. A first valve clack sealing part used for being connected with the first valve seat sealing part in an abutting mode and a second valve clack sealing part used for being connected with the second valve seat sealing part in an abutting mode are arranged on the periphery of the sealing ring. The sealing part of the valve clack is of a detachable and replaceable structure and can be directly replaced after being seriously abraded, the whole valve clack does not need to be replaced, and the maintenance cost is greatly reduced.

Description

Technical Field

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

[0002] A gate valve, also known as a stop valve, is a type of forced-seal valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to ensure a leak-proof seal. When the medium enters the valve from below the valve disc, the resistance that the operating force needs to overcome is the frictional force of the valve stem and packing, plus the thrust generated by the pressure of the medium. The force required to close the valve is greater than the force required to open it, so the valve stem diameter must be large; otherwise, the valve stem may bend.

[0003] Chinese invention patent application CN201811424419.4 discloses a double-seal gate valve with a dual-seal pair structure. During valve closure, the annular sealing pair forms a seal first, achieving a pre-pressure reduction and throttling effect, thereby blocking impurities from entering the area of ​​the conical sealing pair. Then, a small amount of throttled medium flushes the area of ​​the conical sealing pair to remove impurities, resulting in self-cleaning of the sealing surface and effectively preventing impurities from remaining on the sealing surface. Simultaneously, the annular sealing pair reduces the pressure difference of the conical sealing pair, which also helps extend the service life of the sealing pair, effectively solving the problems of incomplete valve closure or damage to the sealing surface, and preventing high-speed medium from scouring the sealing surface, greatly increasing the reliability of the gate valve. However, after long-term use, the dual-seal pair structure will wear down, leading to a deterioration in sealing performance. Therefore, the entire valve disc needs to be replaced. If the valve disc and valve stem are integrated, the entire valve disc and valve stem need to be replaced, resulting in high maintenance costs. Therefore, it is necessary to improve this structure. Utility Model Content

[0004] The purpose of this utility model is to provide a double-seal anti-erosion shut-off valve. The valve disc sealing part of this utility model is a detachable and replaceable structure. When it is severely worn, the part can be directly replaced without replacing the entire valve disc, which greatly reduces maintenance costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a double-seal anti-erosion shut-off valve, comprising a valve body, a valve stem, a valve disc, and a valve seat. The valve body is provided with an inlet flow channel, a middle cavity, and an outlet flow channel connected in sequence. The valve stem extends into the middle cavity and connects to the valve disc. The valve seat is disposed in the middle cavity to form a sealing fit with the valve disc when the valve is closed. The valve seat includes a first step portion and a second step portion arranged axially. A first valve seat sealing portion is provided at the inner edge of the first step portion, and a second valve seat sealing portion is provided at the inner edge of the second step portion. The valve disc includes a valve disc body and a sealing ring. The sealing ring is conical in shape and is detachably installed on the valve disc body. The outer periphery of the sealing ring is provided with a first valve disc sealing portion for abutting against the first valve seat sealing portion and a second valve disc sealing portion for abutting against the second valve seat sealing portion.

[0006] By adopting the above technical solution and setting two sealing pairs, even if one sealing pair is worn, the other sealing pair can still play a sealing role. When both sealing pairs are damaged, since the sealing ring with the first valve disc sealing part and the second valve disc sealing part is a detachable structure, only the sealing ring needs to be replaced, without replacing the entire valve disc, which greatly reduces maintenance costs.

[0007] The present invention is further configured such that a connecting post is provided at the lower end of the valve disc body, the sealing ring is sleeved on the outer periphery of the connecting post, a plurality of locking rods are provided on the outer circular surface of the connecting post, and a plurality of locking grooves for cooperating with the locking rods are provided on the inner circular surface of the sealing ring. The locking groove includes an arc-shaped locking part extending circumferentially along the inner circular surface of the sealing ring and an opening part extending downward from the upper end of the sealing ring and communicating with the corresponding arc-shaped locking part.

[0008] By adopting the above technical solution, when installing the sealing ring, the locking rod on the connecting post is screwed into the locking groove of the sealing ring by pushing upward and then rotating, thus connecting the sealing ring and the connecting post. The operation is very convenient, and disassembly can be done by simply reversing the operation.

[0009] The present invention is further provided that the inner wall of the arc-shaped locking part is provided with a damping protrusion for preventing the locking rod from sliding out of the arc-shaped locking part.

[0010] By adopting the above technical solution, the locking rod can be prevented from loosening out of the arc-shaped locking part, making the connection between the sealing ring and the connecting column more stable and reliable.

[0011] The present invention is further configured such that the outer periphery of the connecting column is provided with a plurality of screw holes, one end of the locking rod is threaded into the corresponding screw hole, and the other end of the locking rod is provided with an internal hexagonal groove.

[0012] By adopting the above technical solution, the locking rod is installed on the outer periphery of the connecting post through a threaded connection, and by setting an internal hexagonal groove at the outer end of the locking rod, it is easy to rotate the locking rod with a hexagonal wrench, which greatly facilitates the installation of the locking rod.

[0013] The present invention is further configured such that a tapered guide head with a larger upper diameter and a smaller lower diameter is threadedly connected to the lower end of the connecting column, and the outer diameter of the upper end of the tapered guide head is approximately equal to the outer diameter of the lower end of the sealing ring.

[0014] By adopting the above technical solution, the conical guide head plays a role in guiding and dispersing the water flow, avoiding direct impact of the water flow on the valve disc and preventing damage to the valve disc. At the same time, it also makes the valve closing operation easier.

[0015] The present invention is further configured such that a first sealing gasket is sandwiched between the sealing ring and the valve disc body, and a second sealing gasket is sandwiched between the sealing ring and the conical guide head.

[0016] By adopting the above technical solution, the sealing performance between the sealing ring and the valve disc body, and between the sealing ring and the conical guide head, can be guaranteed, thus preventing media leakage.

[0017] 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 is provided with an inverted T-shaped connecting part, and the upper end of the connecting groove is threaded with a pressure cap for pressing the inverted T-shaped connecting part into the connecting groove.

[0018] By adopting the above technical solution, the valve stem and valve disc can be connected. The connection structure is simple and reliable, and the disassembly and assembly operations are very convenient.

[0019] The present invention is further configured to include a rectifier sleeve and a threaded pressure ring. The rectifier sleeve is disposed on the upper end of the valve seat and has multiple pressure-reducing holes. The threaded pressure ring is threadedly connected to the middle cavity and abuts against the upper end of the rectifier sleeve, so that the valve seat is pressed against the lower end of the middle cavity.

[0020] By adopting the above technical solution, the rectifier sleeve and valve seat are fixed by tightening the threaded pressure ring. The rectifier sleeve with pressure reducing hole can improve the turbulent state of the medium, reduce the impact of medium scouring on internal parts, and improve the service life of the valve.

[0021] The present invention is further configured such that a third sealing gasket is sandwiched between the valve seat and the lower end of the middle cavity.

[0022] By adopting the above technical solution, the sealing between the valve seat and the bottom of the cavity can be guaranteed, and the medium can be prevented from leaking from the gap between them.

[0023] The present invention is further configured such that the upper end of the threaded pressure ring is provided with multiple operating grooves.

[0024] By adopting the above technical solution, an operating groove is set on the threaded gland as a force-bearing point, which makes it easier to rotate the threaded gland and facilitates the assembly and disassembly of the threaded gland. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 for Figure 1 Enlarged structural diagram of section A in the middle;

[0027] Figure 3 This is a schematic diagram of the valve disc structure of this utility model;

[0028] Figure 4 This is an exploded view of the valve disc of this utility model;

[0029] Figure 5 This is a schematic diagram of the sealing ring structure of this utility model;

[0030] Figure 6 This is a schematic diagram of the cooperation structure between the valve disc body and the locking rod of this utility model.

[0031] In the diagram: 1. Valve body; 2. Valve stem; 3. Valve disc; 4. Valve seat; 5. Inlet flow channel; 6. Middle cavity; 7. Outlet flow channel; 8. First step; 9. Second step; 10. First valve seat sealing part; 11. Second valve seat sealing part; 12. Valve disc body; 13. Sealing ring; 14. First valve disc sealing part; 15. Second valve disc sealing part; 16. Connecting post; 17. Locking rod; 18. Locking groove; 19. Arc-shaped locking part; 20. Opening part; 21. Damping protrusion; 22. Screw hole; 23. Internal hexagonal groove; 24. Conical guide head; 25. First sealing gasket; 26. Second sealing gasket; 27. Connecting groove; 28. Inverted T-shaped connecting part; 29. ​​Pressure cap; 30. Rectifying sleeve; 31. Threaded pressure ring; 32. Pressure reducing hole; 33. Third sealing gasket; 34. Operating groove. Detailed Implementation

[0032] 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.

[0033] Example: As attached Figures 1-6The double-seal anti-erosion shut-off valve shown includes a valve body 1, a valve stem 2, a valve disc 3, and a valve seat 4. The valve body 1 has an inlet flow channel 5, a central cavity 6, and an outlet flow channel 7 connected sequentially. The valve stem 2 extends into the central cavity 6 and connects to the valve disc 3. A self-sealing assembly can be used to seal the upper end of the valve body 1 and the valve stem 2. Since the self-sealing assembly is a conventional technology, its specific structure will not be described in detail here. The valve seat 4 is disposed in the central cavity 6 to form a sealing fit with the valve disc 3 when the valve is closed. The valve seat 4 includes a first stepped portion 8 and a second stepped portion 9 arranged axially. The inner edge of the first stepped portion 8... The valve disc 3 is provided with a first valve seat sealing part 10 and a second valve seat sealing part 11 at the inner edge of the second stepped part 9. The first valve seat sealing part 10 and the second valve seat sealing part 11 are made of weld overlay alloy material. The valve disc 3 includes a valve disc body 12 and a sealing ring 13. The sealing ring 13 is conical in shape and is detachably installed on the valve disc body 12. The outer periphery of the sealing ring 13 is provided with a first valve disc sealing part 14 for abutting against the first valve seat sealing part 10 and a second valve disc sealing part 15 for abutting against the second valve seat sealing part 11. The first valve disc sealing part 14 and the second valve disc sealing part 15 are made of weld overlay alloy material. The two sealing pairs are provided so that even if one sealing pair is worn, the other sealing pair can still play a sealing role. When both sealing pairs are damaged, since the sealing ring 13 with the first valve disc sealing part 14 and the second valve disc sealing part 15 is a detachable structure, only the sealing ring 13 needs to be replaced, without replacing the entire valve disc 3, which greatly reduces maintenance costs.

[0034] As attached Figures 2-6 As shown, the lower end of the valve disc body 12 is provided with a connecting post 16, and the sealing ring 13 is sleeved on the outer periphery of the connecting post 16. The outer circular surface of the connecting post 16 is provided with multiple locking rods 17, and the inner circular surface of the sealing ring 13 is provided with multiple locking grooves 18 for cooperating with the locking rods 17. Each locking groove 18 includes an arc-shaped locking portion 19 extending circumferentially along the inner circular surface of the sealing ring 13 and an opening 20 extending downward from the upper end of the sealing ring 13 and communicating with the corresponding arc-shaped locking portion 19. When installing the sealing ring 13, by pushing upwards and then rotating, the locking rods 17 on the connecting post 16 are screwed into the locking grooves 18 of the sealing ring 13, thus connecting the sealing ring 13 to the connecting post 16. The operation is very convenient, and disassembly only requires reversing the operation.

[0035] As attached Figure 5As shown, the inner wall of the arc-shaped locking part 19 is provided with a damping protrusion 21 to prevent the locking rod 17 from sliding out of the arc-shaped locking part 19. The damping protrusion 21 is located on the bottom surface of the arc-shaped locking part 19, and the distance between the damping protrusion 21 and the top surface of the arc-shaped locking part 19 is less than the diameter of the locking rod 17, so that the locking rod 17 can be pushed to pass over the damping protrusion 21. This design can prevent the locking rod 17 from loosening out of the arc-shaped locking part 19, making the connection between the sealing ring 13 and the connecting post 16 more stable and reliable.

[0036] As attached Figure 2 As shown, the connecting post 16 has multiple screw holes 22 on its outer periphery. One end of the locking rod 17 is threaded into the corresponding screw hole 22, meaning the locking rod 17 has an external thread that mates with the screw hole 22. The other end of the locking rod 17 has an internal hexagonal groove 23. The locking rod 17 is installed on the outer periphery of the connecting post 16 by means of a threaded connection. The internal hexagonal groove 23 on the outer end of the locking rod 17 facilitates the rotation of the locking rod 17 with a hexagonal wrench, greatly simplifying the installation of the locking rod 17.

[0037] As attached Figure 2 and attached Figure 3 As shown, the lower end of the connecting column 16 is threaded with a tapered guide head 24 that is larger at the top and smaller at the bottom. The outer diameter of the upper end of the tapered guide head 24 is approximately the same as the outer diameter of the lower end of the sealing ring 13. The tapered guide head 24 serves to guide and disperse the water flow, preventing the water flow from directly impacting the valve disc 3 and causing damage. At the same time, it also makes the valve closing operation easier.

[0038] As attached Figure 2 and attached Figure 3 As shown, a first sealing gasket 25 is sandwiched between the sealing ring 13 and the valve disc body 12, and a second sealing gasket 26 is sandwiched between the sealing ring 13 and the conical guide head 24. This design ensures the sealing between the sealing ring 13 and the valve disc body 12, and between the sealing ring 13 and the conical guide head 24, preventing media leakage.

[0039] As attached Figure 2 As shown, the upper end of the valve disc body 12 is provided with a connecting groove 27, and the lower end of the valve stem 2 is provided with an inverted T-shaped connecting part 28. The upper end of the connecting groove 27 is threaded with a pressure cap 29 for pressing the inverted T-shaped connecting part 28 into the connecting groove 27, that is, the upper end of the connecting groove 27 has an internal thread that mates with the pressure cap 29. This design can realize the connection between the valve stem 2 and the valve disc 3, the connection structure is simple and reliable, and the disassembly and assembly operations are very convenient.

[0040] As attached Figure 2As shown, the shut-off valve also includes a rectifier sleeve 30 and a threaded pressure ring 31. The rectifier sleeve 30 is disposed on the upper end of the valve seat 4, and its outer circular surface fits against the inner circular surface of the central cavity 6. The rectifier sleeve 30 is provided with multiple pressure-reducing holes 32. The threaded pressure ring 31 is threaded into the central cavity 6 (the inner wall of the central cavity 6 has an internal thread that mates with the threaded pressure ring 31) and abuts against the upper end of the rectifier sleeve 30, so that the valve seat 4 is pressed against the lower end of the central cavity 6. By tightening the threaded pressure ring 31, the rectifier sleeve 30 and the valve seat 4 are fixed. The rectifier sleeve 30 with pressure-reducing holes 32 can improve the turbulent flow of the medium, reduce the impact of medium erosion on internal parts, and extend the service life of the valve.

[0041] As attached Figure 2 As shown, a third sealing gasket 33 is sandwiched between the valve seat 4 and the lower end of the central cavity 6. This design ensures the sealing between the valve seat 4 and the bottom of the central cavity 6, preventing the medium from leaking through the gap between them.

[0042] As attached Figure 2 As shown, the upper end of the threaded pressure ring 31 is provided with multiple operating grooves 34. The operating grooves 34 on the threaded pressure cover 29 serve as force-bearing points, which facilitates the rotation operation of the threaded pressure cover 29 and makes it easier to disassemble and assemble the threaded pressure cover 29.

Claims

1. A double-seal anti-erosion shut-off valve, comprising a valve body (1), a valve stem (2), a valve disc (3), and a valve seat (4), wherein the valve body (1) is provided with an inlet flow channel (5), a central cavity (6), and an outlet flow channel (7) connected in sequence; the valve stem (2) extends into the central cavity (6) and is connected to the valve disc (3); the valve seat (4) is disposed in the central cavity (6) for forming a sealing fit with the valve disc (3) when the valve is closed; characterized in that: The valve seat (4) includes a first step portion (8) and a second step portion (9) arranged along the axial direction. The first step portion (8) has a first valve seat sealing portion (10) at its inner edge and the second step portion (9) has a second valve seat sealing portion (11) at its inner edge. The valve disc (3) includes a valve disc body (12) and a sealing ring (13). The sealing ring (13) is conical in shape and is detachably mounted on the valve disc body (12). The outer periphery of the sealing ring (13) is provided with a first valve disc sealing portion (14) for abutting against the first valve seat sealing portion (10) and a second valve disc sealing portion (15) for abutting against the second valve seat sealing portion (11).

2. The double-seal anti-erosion shut-off valve according to claim 1, characterized in that: The valve disc body (12) has a connecting post (16) at its lower end. The sealing ring (13) is sleeved on the outer periphery of the connecting post (16). The outer circular surface of the connecting post (16) has a plurality of locking rods (17). The inner circular surface of the sealing ring (13) has a plurality of locking grooves (18) for cooperating with the locking rods (17). The locking groove (18) includes an arc-shaped locking part (19) extending circumferentially along the inner circular surface of the sealing ring (13) and an opening part (20) extending downward from the upper end of the sealing ring (13) and communicating with the corresponding arc-shaped locking part (19).

3. The double-seal anti-erosion shut-off valve according to claim 2, characterized in that: The inner wall of the arc-shaped locking part (19) is provided with a damping protrusion (21) to prevent the locking rod (17) from sliding out of the arc-shaped locking part (19).

4. The double-seal anti-erosion shut-off valve according to claim 2, characterized in that: The connecting post (16) has multiple screw holes (22) on its outer periphery. One end of the locking rod (17) is threaded into the corresponding screw hole (22), and the other end of the locking rod (17) is provided with an internal hexagonal groove (23).

5. The double-seal anti-erosion shut-off valve according to claim 2, characterized in that: The lower end of the connecting column (16) is threaded with a tapered guide head (24) that is larger at the top and smaller at the bottom. The outer diameter of the upper end of the tapered guide head (24) is similar to the outer diameter of the lower end of the sealing ring (13).

6. The double-seal anti-erosion shut-off valve according to claim 5, characterized in that: A first sealing gasket (25) is sandwiched between the sealing ring (13) and the valve disc body (12), and a second sealing gasket (26) is sandwiched between the sealing ring (13) and the conical guide head (24).

7. The double-seal anti-erosion shut-off valve according to claim 1, characterized in that: The valve disc body (12) has a connecting groove (27) at its upper end, and the valve stem (2) has an inverted T-shaped connecting part (28) at its lower end. The upper end of the connecting groove (27) is threaded with a pressure cap (29) for pressing the inverted T-shaped connecting part (28) in the connecting groove (27).

8. The double-seal anti-erosion shut-off valve according to claim 1, characterized in that: It also includes a rectifier sleeve (30) and a threaded pressure ring (31). The rectifier sleeve (30) is disposed on the upper end of the valve seat (4), and the rectifier sleeve (30) is provided with a plurality of pressure reducing holes (32). The threaded pressure ring (31) is threadedly connected to the middle cavity (6) and abuts against the upper end of the rectifier sleeve (30), so that the valve seat (4) is pressed against the lower end of the middle cavity (6).

9. The double-seal anti-erosion shut-off valve according to claim 8, characterized in that: A third sealing gasket (33) is sandwiched between the valve seat (4) and the lower end of the middle cavity (6).

10. The double-seal anti-erosion shut-off valve according to claim 8, characterized in that: The upper end of the threaded pressure ring (31) is provided with multiple operating grooves (34).

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