Valve clack sealing structure of stop valve
By introducing a boss into the valve disc sealing structure of the gate valve to cooperate with the valve seat hole, combined with the design of oblique hole and overrun groove, the problem of sealing surface leakage under high temperature and high pressure is solved, and the sealing surface is protected and the stability of the valve is improved.
Patent Information
- Application Number
- CN202520013609.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-01-03
AI Technical Summary
Under high temperature and pressure, forged steel gate valves with conical sealing structures are prone to leakage at the sealing surface due to media erosion and particle wear during use, which affects the normal operation of pipelines.
Design a valve disc sealing structure for a gate valve, which uses a boss that fits into the valve seat hole. The medium first flushes the boss rather than the sealing surface, and avoids friction damage during the opening process by passing through the overrun groove. Combined with the inclined hole design, it can remove impurities.
It effectively reduces erosion of the sealing surface, extends valve service life, improves sealing performance and reliability, and prevents impurities from damaging the sealing surface.
Smart Images
Figure CN223677035U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of stop valve, specifically is a stop valve clack sealing structure. BACKGROUND
[0002] At present, in some important pipelines, especially high-temperature and high-pressure steam pipelines, most of the forged steel stop valves used adopt conical surface sealing structures, and many stop valves will leak after being used for a period of time, which is mainly caused by the erosion of medium under high temperature and high pressure and the damage of particles in the medium, even if the valve rod is forcibly tightened and the closing torque is increased, the leakage will not be eliminated, and the clack sealing surface will leak again after being used for a period of time, which will seriously affect the normal operation of the whole pipeline. CONTENT OF THE UTILITY MODEL
[0003] In order to overcome the above-mentioned defects, the utility model provides a stop valve clack sealing structure.
[0004] The technical scheme adopted by the utility model is as follows:
[0005] A stop valve clack sealing structure, comprising a valve body, a chamber is formed in the valve body, a valve seat hole is formed in the central bottom of the inner part of the valve body, the valve seat hole is communicated with the chamber of the valve body, the top of the valve seat hole is provided with a clack, the top of the clack is provided with a central hole, a pressing sleeve is fixedly connected in the top hole of the clack, the upper outer wall of the pressing sleeve is protruded, a loose pad is arranged between the protruded outer wall of the pressing sleeve and the top of the clack, the loose pad is embedded in the outer wall of the pressing sleeve, a valve rod is arranged above the clack, the lower end of the valve rod is fixedly connected with the inner wall of the pressing sleeve, a boss is fixedly connected to the bottom of the clack, the boss is slidably matched with the valve seat hole, a medium inlet is formed in the left bottom of the valve body, a medium outlet is formed in the right bottom of the valve body, the medium inlet is communicated with the valve seat hole, an inclined hole is formed in the right side of the chamber of the valve body, the right end of the inclined hole extends downward, the left end of the inclined hole is communicated with the chamber of the valve body, and the right end of the inclined hole is communicated with the medium outlet.
[0006] An overtravel groove is formed between the top of the outer wall of the boss and the bottom of the clack.
[0007] The utility model has the advantages of:
[0008] The design of the boss makes the medium first flush the boss instead of the sealing surface of the clack at the moment when the valve is opened and closed, thereby effectively reducing the erosion of the sealing surface and prolonging the service life of the valve.
[0009] In the process of closing the valve, the cooperation of the boss and the valve seat hole can carry away part of the impurities in the medium, prevent the impurities from entering and damaging the sealing surface of the clack, and ensure the sealing performance of the valve.
[0010] The over-travel groove is designed to allow the boss to have a certain displacement space when it is separated from the valve seat hole, avoids damage caused by friction, and improves the reliability and stability of the valve. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 is a structural schematic diagram of the utility model.
[0012] In all the drawings, the reference signs are specifically: 1, valve body; 2, valve disc; 3, pressing sleeve; 4, anti-loosening pad; 5, valve stem; 6, medium inlet; 7, valve seat hole; 8, inclined hole; 9, medium outlet; 10, boss; 11, over-travel groove. DETAILED DESCRIPTION
[0013] As Figure 1 shown: a stop valve disc sealing structure, including valve body 1, the cavity is set up in valve body 1, the inside center bottom of valve body 1 is provided with valve seat hole 7, valve seat hole 7 is communicated with the cavity of valve body 1, the top of valve seat hole 7 has valve disc 2, the top central hole of valve disc 2 is fixedly connected with pressing sleeve 3 in the top hole of valve disc 2, the upper outer wall of pressing sleeve 3 is protruded, the outer wall protrusion of pressing sleeve 3 has anti-loosening pad 4 between the top of valve disc 2, anti-loosening pad 4 is embedded in the outer wall of pressing sleeve 3, valve body 1 top has valve stem 5, the lower end of valve stem 5 is fixedly connected with the inner wall of pressing sleeve 3, the bottom of valve disc 2 is fixedly connected with boss 10, boss 10 is slidably connected with valve seat hole 7, the left bottom of valve body 1 is provided with medium inlet 6, the right bottom of valve body 1 is provided with medium outlet 9, medium inlet 6 is communicated with valve seat hole 7, the right side of the cavity of valve body 1 is provided with inclined hole 8, the right end of inclined hole 8 extends to the right lower, the left end of inclined hole 8 is communicated with the cavity of valve body 1, the right end of inclined hole 8 is communicated with medium outlet 9.
[0014] The over-travel groove 11 is set up between the top of the outer wall of boss 10 and the bottom of valve disc 2.
[0015] When the valve is in the closed state, valve disc 2 and boss 10 are tightly matched with valve seat hole 7, forming a seal, and the medium cannot flow out through medium outlet 9.
[0016] The design of boss 10 makes the medium first flush the outer surface of boss 10 when the valve is closed, instead of the sealing surface of valve disc 2, thereby protecting the sealing surface of valve disc 2 from erosion.
[0017] When the valve needs to be opened, valve stem 5 is lifted, driving pressing sleeve 3 and valve disc 2 to rise together, and boss 10 gradually separates from valve seat hole 7, and the medium begins to flow out through medium outlet 9.
[0018] During the opening process, the over-travel groove 11 between the top of the outer wall of boss 10 and the bottom of valve disc 2 allows boss 10 to have a certain displacement space when it is separated from valve seat hole 7, avoiding damage caused by friction.
[0019] When the valve is fully open, the valve disc 2 and the boss 10 are completely separated from the valve seat hole 7, and the medium passes through the medium outlet 9 unimpeded.
[0020] When the valve is closed, the valve stem 5 is lowered, and the pressure sleeve 3 and the valve disc 2 are lowered together. The boss 10 first contacts the valve seat hole 7 to form a seal. During the closing process, the cooperation between the boss 10 and the valve seat hole 7 can carry away part of the impurities in the medium, preventing the impurities from damaging the sealing surface of the valve disc 2.
Claims
1. A seal structure for a valve disc of a globe valve, characterized by The utility model relates to a valve, including valve body (1), the chamber is opened in valve body (1), the bottom of inside center of valve body (1) is opened with valve seat hole (7), valve seat hole (7) is communicated with the chamber of valve body (1), the top of valve seat hole (7) has valve clack (2), the top of valve clack (2) is opened with hole, the top hole of valve clack (2) is fixedly connected with pressure jacket (3), the upper outer wall of pressure jacket (3) is protruding, and the outer wall protruding of pressure jacket (3) has anti-loosening pad (4) between the top of valve clack (2), and anti-loosening pad (4) is embedded in the outer wall of pressure jacket (3), the top of valve clack (2) has valve stem (5) above, the inner wall of pressure jacket (3) is fixedly connected with the lower end of valve stem (5), the bottom of valve clack (2) is fixedly connected with boss (10), and boss (10) is slidably connected with valve seat hole (7), the bottom of left side of valve body (1) is opened with medium inlet (6), the bottom of right side of valve body (1) is opened with medium outlet (9), medium inlet (6) is communicated with valve seat hole (7), and the chamber right side of valve body (1) is opened with inclined hole (8), the right end of inclined hole (8) extends right down, the left end of inclined hole (8) is communicated with the chamber of valve body (1), and the right end of inclined hole (8) is communicated with medium outlet (9).
2. A disc seal for a globe valve according to claim 1, wherein, The outer wall top of boss (10) is opened with overtravel slot (11) between the bottom of valve clack (2).