Anti-scouring high-pressure forged steel stop valve

Abstract

The utility model relates to the technical field of valves, in particular to an anti-scouring high-pressure forged steel stop valve, which is characterized in that a valve seat mounting step notch is arranged at the upper port of a valve seat mounting port, a valve seat is mounted on the valve seat mounting step notch, and a spiral wound gasket is clamped between the bottom of the valve seat and the valve seat mounting step notch; the lower end of the valve rod is connected with the valve clack through a steel ball; the upper end of the valve rod penetrates through the valve cover and then is connected with a driving device through a valve rod nut; the valve cover is connected with the valve body through a second bolt assembly, the bottom end of the lower section of the valve cover is embedded in the top of the throttling ring, and a first sealing ring is clamped between the valve cover and the throttling ring. A throttling ring is installed in the valve seat installation opening, the valve clack is movably arranged in the throttling ring, and the periphery of the lower end of the valve clack and the inner ring face of an upper end opening of the valve seat are both sealing faces and movably abut against each other. A throttling hole is formed in the throttling ring, and a certain distance is formed between the throttling hole and the sealing face of the inner ring face of the upper end opening of the valve seat. The valve clack has high anti-scouring performance, the valve clack is effectively protected, and the service life of the valve clack is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to an anti-erosion high-pressure forged steel gate valve. Background Technology

[0002] Existing high-temperature and high-pressure gate valves are bulky, costly to manufacture, have unstable performance, are prone to leakage, and are inconvenient to maintain. Furthermore, when the medium enters the valve body, it can easily cause a large impact on the valve disc, affecting the service life of the valve disc. Utility Model Content

[0003] The purpose of this utility model is to address the defects and shortcomings of the existing technology by providing an anti-erosion high-pressure forged steel gate valve. It has high anti-erosion performance, effectively protects the valve disc, and extends the service life of the valve disc. It is mainly used in high-temperature and high-pressure steam pipelines to close or open the pipeline medium and maintain the normal operation of the system. It also has the advantages of compact structure, reliable performance, tight sealing, and convenient disassembly.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: it includes a valve body, a valve seat, a valve disc, a valve stem, and a valve cover; the inlet and outlet channels within the valve body are both oblique holes, with the end of the inlet channel communicating with the throttling ring mounting port within the valve body, and the outlet channel communicating with the valve seat mounting port within the valve body; the upper port of the valve seat mounting port has a valve seat mounting step recess, the valve seat is mounted on the valve seat mounting step recess, and a spiral wound gasket is sandwiched between the bottom of the valve seat and the valve seat mounting step recess; the lower end of the valve stem is connected to the valve disc using a steel ball; the valve... After the upper end of the rod passes through the valve cover, it is connected to the drive device by the valve stem nut; the valve cover is connected to the valve body by bolt assembly two; a throttling ring is installed in the valve seat mounting port, the bottom end of the lower section of the valve cover is embedded in the top of the throttling ring, and a sealing ring one is sandwiched between the two; the valve disc is movably disposed in the throttling ring, and the lower outer periphery of the valve disc and the inner ring surface of the upper port of the valve seat are both sealing surfaces, and the two are movably in contact; a throttling hole is opened on the throttling ring, and the throttling hole and the sealing surface of the inner ring surface of the upper port of the valve seat are set at a certain distance.

[0005] Preferably, a stuffing box is provided inside the top of the lower section of the valve cover. The stuffing box contains a stuffing pad and a packing in sequence from bottom to top. A packing sleeve is pressed on the top of the packing. The top of the packing sleeve has a convex arc-shaped structure, which cooperates with the concave arc-shaped structure at the bottom of the packing pressure plate. The packing pressure plate is connected to a hinge bolt by a nut. A washer is sandwiched between the nut and the packing pressure plate. The lower end of the hinge bolt is connected to the top of the lower section of the valve cover by a cotter pin.

[0006] Preferably, a sealing ring 2 is provided between the valve stem nut and the bottom of the upper inner wall of the valve cover.

[0007] Preferably, the valve stem nut is mounted inside the upper section of the valve cover using a bearing, and a bearing cap is pressed onto the upper bearing. The bearing cap is connected to the upper section of the valve cover using a countersunk pin. The top of the valve stem nut is connected to the three-jaw jack of the drive device using a three-jaw jack. The drive device is connected to the upper section of the valve cover using a bolt assembly.

[0008] Preferably, the throttling ring has a balance hole that communicates with the throttling ring mounting opening, and the balance hole is located above the throttling hole.

[0009] Preferably, the guide rib between the lower and upper sections of the valve cover is slidably connected to two symmetrical clamps, which are bolted to the valve stem.

[0010] Preferably, the valve stem has a flat groove on its side wall, and one end of each of the two clamping plates is embedded in the flat groove.

[0011] Preferably, the sealing surface of the inner ring of the upper port of the valve seat adopts an advanced process of powder preforming + vacuum induction welding, which has the advantages of low dilution rate, uniform hardness distribution, less susceptibility to cracking, no loss of alloy powder, low production cost, and high production efficiency.

[0012] Preferably, the packing material is a novel flexible graphite low-leakage composite molding packing material, which can give the stuffing box part better sealing ability and give the packing material more durable compensation ability and sealing life.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This utility model provides an anti-erosion high-pressure forged steel gate valve, which has high anti-erosion performance, effectively protects the valve disc, and extends the service life of the valve disc. It is mainly used in high-temperature and high-pressure steam pipelines to close or open the pipeline medium and maintain the normal operation of the system. It also has the advantages of compact structure, reliable performance, tight sealing, and convenient disassembly. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 yes Figure 1 Enlarged view of section A.

[0016] Figure 3 This is a schematic diagram of the throttling coil in this utility model.

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Valve body, 1-1. Throttling ring mounting port, 1-2. Valve seat mounting port, 1-3. Valve seat mounting step recess, 2. Spiral wound gasket, 3. Valve seat, 4. Valve disc, 5. Steel ball, 6. Throttling ring, 6-1. Throttling orifice, 6-2. Balance hole, 7. Sealing ring one, 8. Valve stem, 9. Valve cover, 9-1. Guide rib, 10. Packing gasket, 11. Cotter pin, 12. Swivel bolt, 13. Washer, 14. Nut, 15. Bolt, 16. Clamping plate, 17. Sealing ring two, 18. Valve stem nut, 19. Countersunk pin, 20. Drive unit, 21. Bolt assembly one, 22. Bearing cover, 23. Bearing, 24. Packing pressure plate, 25. Packing sleeve, 26. Packing, 27. Bolt assembly two. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. The preferred embodiments described are only examples. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] like Figures 1-3As shown, this specific embodiment adopts the following technical solution: It includes a valve body 1, a valve seat 3, a valve disc 4, a valve stem 8, and a valve cover 9; the inlet and outlet channels in the valve body 1 are both oblique holes, and the end of the inlet channel communicates with the throttle ring mounting port 1-1 in the valve body 1, and the outlet channel communicates with the valve seat mounting port 1-2 in the valve body 1; the upper port of the valve seat mounting port 1-2 is provided with a valve seat mounting step recess 1-3, the valve seat 3 is mounted on the valve seat mounting step recess 1-3, and a spiral wound gasket 2 is sandwiched between the bottom of the valve seat 3 and the valve seat mounting step recess 1-3; after the upper end of the valve stem 8 passes through the valve cover 9, it is connected to the drive device 20 by means of a valve stem nut 18, and the valve stem nut 18 is connected by means of a trapezoidal internal thread and a trapezoidal external thread at the top of the valve stem 8. The valve stem 8 is raised or lowered by the trapezoidal internal and external threads, which in turn moves the valve disc 4 up and down, thus opening or closing the valve. The valve stem nut 18 is installed inside the upper section of the valve cover 9 using a bearing 23. A bearing cap 22 is pressed onto the upper bearing 23. The bearing cap 22 is connected to the upper section of the valve cover 9 using a countersunk pin 19. The top of the valve stem nut 18 is connected to the three-jaw jack of the drive device 20 using a three-jaw jack. The drive device 20 is connected to the upper section of the valve cover 9 using a bolt assembly 21. A sealing ring 17 is provided between the valve stem nut 18 and the bottom of the inner wall of the upper section of the valve cover 9. The valve cover 9 is connected to the valve body 1 using a bolt assembly 27, and the bottom end of the lower section of the valve cover 9 is embedded in the top of the throttling ring 6. A sealing ring 17 is sandwiched between the two. Sealing ring 7; a throttling ring 6 is installed in the valve seat mounting port 1-2, and the valve disc 4 is movably disposed within the throttling ring 6 (the outer circle of the valve disc 4 is in close fit with the inner hole of the throttling ring 6, and the inner hole of the valve disc 4 is in close fit with the lower end of the valve stem 8). The valve disc 4 is connected to the head of the valve stem 8 through a steel ball 5, which ensures that the valve disc 4 and the throttling ring 6 are tightly fitted when opening and closing, solving the problem of vibration and noise, and also ensures that the valve disc 4 and the valve stem 8 are movably connected, preventing jamming and facilitating maintenance. The lower outer periphery of the valve disc 4 and the inner ring surface of the upper port of the valve seat 3 are both sealing surfaces, and the two are movably in contact. The sealing surface of the inner ring surface of the upper port of the valve seat 3 adopts an advanced process of powder preforming + vacuum induction welding, which has the characteristics of low dilution rate, uniform hardness distribution, and low susceptibility to defects. It has the advantages of crack prevention, no loss of alloy powder, low production cost, and high production efficiency; the throttling ring 6 has a throttling hole 6-1, which is set at a certain distance from the sealing surface of the inner ring surface of the upper port of the valve seat 3, avoiding the scouring of the sealing surface by the high-speed flowing medium during the opening and closing of the valve disc 4, protecting the sealing surface of the valve seat 3 and the valve disc 4, ensuring the sealing performance of the valve sealing surface, and extending the service life of the valve; the throttling ring 6 has a balance hole 6-2 that communicates with the throttling ring mounting port 1-1, which is located above the throttling hole 6-1, so that the cavity pressure of the upper part of the valve disc 4 and the throttling ring 6 is balanced with the inlet channel pressure of the valve, thereby reducing the valve opening and closing torque and making the valve opening and closing easy;

[0021] The valve cover 9 has a stuffing box inside its lower section. Inside the stuffing box, from bottom to top, are a stuffing pad 10 and a packing 26. The packing 26 is a new type of flexible graphite low-leakage composite molded packing, which provides better sealing capability to the stuffing box and longer-lasting compensation and sealing life. A packing sleeve 25 is pressed onto the top of the packing 26. The top of the packing sleeve 25 has a convex arc-shaped structure, which cooperates with the concave arc-shaped structure at the bottom of the packing pressure plate 24 to ensure uniform force distribution around the packing 26, thus better maintaining reliable and long-lasting sealing performance. The packing pressure plate 24 is connected to a hinge bolt 1 by a nut 14. 2. A washer 13 is clamped between the nut 14 and the packing pressure plate 24. The lower end of the hinge bolt 12 is connected to the top of the lower section of the valve cover 9 by a cotter pin 11. Two symmetrical clamping plates 16 are slidably connected to the side wall of the guide rib 9-1 between the lower and upper sections of the valve cover 9. The side wall of the valve stem 8 is fitted with a flat groove. One end of each clamping plate 16 is embedded in the flat groove. The two clamping plates 16 are connected by bolts 15, so that the two clamping plates 16 are clamped on the valve stem 8. This ensures that the valve stem 8 only moves up and down and does not rotate when the valve is opened and closed, which reduces the frictional damage between the valve disc 4 and the throttling sleeve 6 and between the valve stem 8 and the packing 26, and extends the service life of the valve.

[0022] When using this utility model, the valve stem nut 18 is rotated by the driving device 20, thereby driving the valve stem 8 to move up and down, which in turn drives the valve disc 4 to move up and down, realizing the opening and closing of the valve. At the moment the valve is opened, the medium enters the throttling hole 6-1 from the inlet channel, effectively reducing the scouring of the sealing surface by the high-speed flowing medium, protecting the sealing surfaces of the valve seat 3 and the valve disc 4, ensuring the sealing performance of the valve sealing surface, and thus achieving the purpose of scouring prevention. The medium enters the valve seat mounting port 1-2 from the throttling hole 6-1 and falls into the outlet channel, and is finally discharged from the outlet channel.

[0023] Compared with the prior art, the beneficial effects of this utility model are: This utility model provides an anti-erosion high-pressure forged steel gate valve, which has high anti-erosion performance, effectively protects the valve disc, and extends the service life of the valve disc. It is mainly used in high-temperature and high-pressure steam pipelines to close or open the pipeline medium and maintain the normal operation of the system. It also has the advantages of compact structure, reliable performance, tight sealing, and convenient disassembly.

[0024] For those skilled in the art, modifications can be made to the technical solutions described in the foregoing embodiments, and equivalent substitutions can be made to some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-pressure forged steel gate valve for erosion protection, comprising a valve body (1), a valve seat (3), a valve disc (4), a valve stem (8), and a valve cover (9); the inlet and outlet channels in the valve body (1) are both oblique holes, and the end of the inlet channel is connected to the throttle ring mounting port (1-1) in the valve body (1), and the outlet channel is connected to the valve seat mounting port (1-2) in the valve body (1); the upper port of the valve seat mounting port (1-2) is provided with a valve seat mounting step recess (1-3), and the valve... The seat (3) is installed on the valve seat mounting step recess (1-3), and a spiral wound gasket (2) is sandwiched between the bottom of the valve seat (3) and the valve seat mounting step recess (1-3); the lower end of the valve stem (8) is connected to the valve disc (4) by a steel ball (5); the upper end of the valve stem (8) passes through the valve cover (9) and is connected to the drive device (20) by a valve stem nut (18); the valve cover (9) is connected to the valve body (1) by bolt assembly two (27); the characteristic is that: A throttling ring (6) is installed in the valve seat mounting port (1-2). The bottom end of the lower section of the valve cover (9) is embedded in the top of the throttling ring (6). A sealing ring (7) is sandwiched between the two. The valve disc (4) is movably disposed in the throttling ring (6). The outer periphery of the lower end of the valve disc (4) and the inner ring surface of the upper port of the valve seat (3) are both sealing surfaces, and the two are movably abutting each other. A throttling hole (6-1) is opened on the throttling ring (6).

2. The anti-erosion high-pressure forged steel gate valve according to claim 1, characterized in that: The valve cover (9) is provided with a stuffing box at the top of the lower section. The stuffing box is provided with a stuffing pad (10) and a packing (26) from bottom to top. A packing sleeve (25) is pressed on the top of the packing (26). The top of the packing sleeve (25) is a convex arc structure, which cooperates with the concave arc structure at the bottom of the packing plate (24). The packing plate (24) is connected to a hinge bolt (12) by a nut (14). A washer (13) is sandwiched between the nut (14) and the packing plate (24). The lower end of the hinge bolt (12) is connected to the top of the lower section of the valve cover (9) by a cotter pin (11).

3. The anti-erosion high-pressure forged steel gate valve according to claim 2, characterized in that: A sealing ring 2 (17) is provided between the valve stem nut (18) and the bottom of the upper inner wall of the valve cover (9).

4. The anti-erosion high-pressure forged steel gate valve according to claim 3, characterized in that: The valve stem nut (18) is installed inside the upper section of the valve cover (9) using a bearing (23). A bearing cap (22) is pressed on the upper bearing (23). The bearing cap (22) is connected to the upper section of the valve cover (9) using a countersunk pin (19). The top of the valve stem nut (18) is connected to the three-jaw drive device (20) using a three-jaw jack. The drive device (20) is connected to the upper section of the valve cover (9) using a bolt assembly (21).

5. The anti-erosion high-pressure forged steel gate valve according to claim 4, characterized in that: The throttling ring (6) has a balance hole (6-2) that communicates with the throttling ring mounting port (1-1), and the balance hole (6-2) is located above the throttling hole (6-1).

6. The anti-erosion high-pressure forged steel gate valve according to claim 5, characterized in that: The guide rib (9-1) between the lower and upper sections of the valve cover (9) has two symmetrical clamps (16) that are slidably connected to the side wall. The two symmetrical clamps (16) are installed on the valve stem (8) by bolts (15).

7. The anti-erosion high-pressure forged steel gate valve according to claim 6, characterized in that: The valve stem (8) has a flat groove on its side wall, and one end of each of the two clamps (16) is embedded in the flat groove.

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