Unloading type high-pressure manual stop valve

Abstract

The utility model belongs to the technical field of valves, and discloses an unloading type high-pressure manual stop valve which comprises a valve body, the valve body is connected with a valve cover through a connecting piece, a valve seat is arranged in the valve body, a sealing face is arranged on the valve seat, a valve clack matched with the valve seat in a sealing mode is further arranged in the valve body, and a sealing face is arranged on the conical face of the valve clack. The sealing face of the valve seat and the sealing face of the valve clack are connected to form a sealing pair, one end of the valve clack is connected with a valve rod, the other end of the valve rod is fixedly connected with a hand wheel, and a first O-shaped ring and a first check ring are installed on a groove of the valve clack to form radial dynamic sealing with the valve deck. A groove of the valve rod is provided with a first O-shaped ring and a first check ring, and the first O-shaped ring and the first check ring form radial dynamic sealing with the valve body. An unloading type structure is adopted, the valve rod is free from the action of gas pressure in the moving process, manual operation is reduced, and operation is convenient; the valve clack and the valve rod are in spherical connection through the T-shaped groove, and the service life of the soft sealing valve seat is greatly prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to an unloading type high-pressure manual shut-off valve. Background Technology

[0002] Gate valves consist of components such as valve body, valve disc, valve cover, valve stem, and seals. They serve to connect and disconnect various types of fluids, including gas, water, steam, and oil, in pipelines. Currently, gate valves produced domestically, especially those under high pressure, have large operating torques, short service lives, and significant pressure losses. Utility Model Content

[0003] The purpose of this invention is to provide an unloading type high-pressure manual shut-off valve to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A pressure relief type manual shut-off valve includes a valve body, a valve cover connected to the valve body via a connector, a valve seat inside the valve body with a sealing surface, and a valve disc inside the valve body that seals with the valve seat. The valve disc has a sealing surface on its conical surface. When the valve is closed, the sealing surfaces of the valve seat and the valve disc come into contact to form a sealing pair. One end of the valve disc is connected to a valve stem, and the other end of the valve stem is fixedly connected to a handwheel. A first O-ring and a first retaining ring are installed on the groove of the valve disc to form a radial dynamic seal with the valve cover. A first O-ring and a first retaining ring are also installed on the groove of the valve stem to form a radial dynamic seal with the valve body.

[0006] Furthermore, the sealing surface of the valve seat is an arc surface or a conical surface.

[0007] Furthermore, the cone angle of the valve disc is between 30° and 40°.

[0008] Furthermore: the valve disc and valve cover form a radial dynamic sealing section with diameter d1, the sealing pair formed after the sealing surface of the valve seat and the sealing surface of the valve disc come into contact has diameter d2, and the valve stem and valve body form a radial dynamic sealing section with diameter d3. The cross-sectional dimensions are d1 = d2 = d3.

[0009] Furthermore: the connector is a Phillips head countersunk screw, and the valve stem and handwheel are connected by an internal hex socket screw.

[0010] Furthermore: the valve stem and valve body are used in conjunction with a screw thread.

[0011] Furthermore, a second O-ring is installed in the groove between the valve cover and the valve seat and the valve body.

[0012] Furthermore: a dustproof net is provided on the inner side of the valve cover, and a second retaining ring is provided on one side of the dustproof net.

[0013] Furthermore: the valve disc and valve stem are connected by a T-groove spherical surface.

[0014] Furthermore, the valve seat material is made of polychlorotrifluoroethylene, a soft sealing material.

[0015] Compared with existing technologies, the beneficial effects are:

[0016] 1. The valve disc and valve stem assembly is an unloading structure. During manual opening and closing, the valve body and valve stem threads are protected from gas pressure, resulting in almost no wear on the threads and greatly improving the service life of the valve stem.

[0017] 2. The connection between the valve disc and the valve stem adopts a T-groove spherical connection, which enables radial frictionless sealing during valve closure, thus greatly improving the service life of the soft-seal valve seat;

[0018] 3. Most high-pressure gate valves use a metal-to-metal hard seal. When the valve is closed several times, the valve stem rotates, causing sealing indentations on the conical sealing surface. This reduces the sealing performance when the valve is closed, and may even render the valve unusable. To improve its sealing performance, the valve seat uses polychlorotrifluoroethylene soft sealing material. This material is produced using a special process, resulting in a high degree of smoothness on the sealing surface and resistance to deformation under compression. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the fully closed state structure of the unloading type high-pressure manual shut-off valve described in this utility model;

[0020] Figure 2 This is a schematic diagram of the throttling state structure of an unloading type high-pressure manual shut-off valve according to this utility model;

[0021] Figure 3 yes Figure 2 Enlarged view of point I in the middle;

[0022] Figure 4 This is a schematic diagram of the fully open state structure of the unloading type high-pressure manual shut-off valve described in this utility model.

[0023] In the attached diagram, the following are the reference numerals: 1. Valve cover; 2. First retaining ring; 3. Valve disc; 4. Valve seat; 5. Valve stem; 6. Valve body; 7. Handwheel; 8. Dustproof net; 10. First O-ring; 11. Second O-ring; 13. Second retaining ring; 14. Phillips head countersunk screw; 15. Socket head cap screw. Detailed Implementation

[0024] 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.

[0025] Please see Figures 1-4 A type of unloading high-pressure manual shut-off valve includes a valve body 6, to which a valve cover 1 is connected via a Phillips head countersunk screw 14. A valve seat 4 is located inside the valve body 6. The valve seat 4 is made of polychlorotrifluoroethylene (PTFE), a soft sealing material produced using a special process, resulting in a high-smoothness sealing surface that is resistant to deformation under compression. A sealing surface is provided on the valve seat 4. The valve body 6 also contains a valve disc 3 that seals against the valve seat 4. The conical surface of the valve disc 3 has a sealing surface. When the valve is closed, the sealing surfaces of the valve seat 4 and valve disc 3 come into contact to form a sealing pair. When the sealing pair is open, the flow channels of the valve seat 4 and valve disc 3 form a narrow annular flow channel, achieving a throttling and pressure-reducing effect. The opening of the sealing pair is used for media reception. The valve disc 3 is used to cut off the medium after the sealing pair is closed. One end of the valve disc 3 is connected to the valve stem 5 through a T-groove spherical surface. The T-groove spherical surface connection enables the valve to achieve radial frictionless sealing during the closing process, which greatly improves the service life of the soft-seal valve seat 4. The valve stem 5 and the valve body 6 are used in conjunction with a screw thread, which is not affected by gas pressure. The thread has almost no wear, which greatly improves the service life of the valve stem 5. The other end of the valve stem 5 is connected to the handwheel 7 through an internal hexagon screw 15. The groove of the valve disc 3 is equipped with a first O-ring 10 and a first retaining ring 2 to form a radial dynamic seal with the valve cover 1. The groove of the valve stem 5 is equipped with a first O-ring 10 and a first retaining ring 2 to form a radial dynamic seal with the valve body 6.

[0026] Furthermore, the sealing surface of valve seat 4 is an arc surface or a conical surface.

[0027] Furthermore, the cone angle of valve disc 3 is between 30° and 40°.

[0028] Furthermore: the valve disc 3 and the valve cover 1 form a radial dynamic sealing section with a diameter of d1; the sealing surface of the valve seat 4 and the sealing surface of the valve disc 3 form a sealing pair section with a diameter of d2; the valve stem 5 and the valve body 6 form a radial dynamic sealing section with a diameter of d3. The three sealing section dimensions are d1 = d2 = d3. The valve stem 5 is not subjected to gas pressure during movement, reducing manual operation and making operation easier. When the valve disc 3 is instantaneously open, the throttling structure of the valve disc 3 and the full-bore flow channel of the valve body 6 form a throttling ring with the full-bore flow channel, which plays a role in throttling and pressure reduction.

[0029] Furthermore, a second O-ring 11 is installed in the groove between the valve cover 1 and the valve seat 4 and the valve body 6.

[0030] Furthermore: a dustproof net 8 is provided on the inner side of the valve cover 1, and a second retaining ring 13 is provided on one side of the dustproof net 8.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure-relief type manual shut-off valve, characterized in that: The valve body (6) is connected to a valve cover (1) via a connector. A valve seat (4) is provided inside the valve body (6). A sealing surface is provided on the valve seat (4). A valve disc (3) is also provided inside the valve body (6) to seal with the valve seat (4). A sealing surface is provided on the conical surface of the valve disc (3). When the valve is closed, the sealing surface of the valve seat (4) and the sealing surface of the valve disc (3) come into contact to form a sealing pair. A valve stem (5) is connected to one end of the valve disc (3). A handwheel (7) is fixedly connected to the other end of the valve stem (5). A first O-ring (10) and a first retaining ring (2) are installed on the groove of the valve disc (3) to form a radial dynamic seal with the valve cover (1). A first O-ring (10) and a first retaining ring (2) are installed on the groove of the valve stem (5) to form a radial dynamic seal with the valve body (6).

2. The unloading type high-pressure manual shut-off valve according to claim 1, characterized in that: The sealing surface of the valve seat (4) is an arc surface or a conical surface.

3. The unloading type high-pressure manual shut-off valve according to claim 2, characterized in that: The cone angle of the valve disc (3) is between 30° and 40°.

4. The unloading type high-pressure manual shut-off valve according to claim 1, characterized in that: The valve disc (3) and the valve cover (1) form a radial dynamic sealing section with a diameter d1. The sealing surface of the valve seat (4) and the sealing surface of the valve disc (3) are connected to form a sealing pair section with a diameter d2. The valve stem (5) and the valve body (6) form a radial dynamic sealing section with a diameter d3. The cross-sectional dimensions are d1 = d2 = d3.

5. The unloading type high-pressure manual shut-off valve according to claim 1, characterized in that: The connector is a Phillips head countersunk screw (14), and the valve stem (5) and the handwheel (7) are connected by an internal hex screw (15).

6. The unloading type high-pressure manual shut-off valve according to claim 1, characterized in that: The valve stem (5) and the valve body (6) are used in conjunction with a screw thread.

7. The unloading type high-pressure manual shut-off valve according to claim 1, characterized in that: A second O-ring (11) is installed in the groove between the valve cover (1) and the valve seat (4) and the valve body (6).

8. The unloading type high-pressure manual shut-off valve according to claim 1, characterized in that: A dustproof net (8) is provided on the inner side of the valve cover (1), and a second retaining ring (13) is provided on one side of the dustproof net (8).

9. The unloading type high-pressure manual shut-off valve according to claim 1, characterized in that: The valve disc (3) and the valve stem (5) are connected by a T-groove spherical surface.

10. The unloading type high-pressure manual shut-off valve according to claim 1, characterized in that: The valve seat (4) is made of polychlorotrifluoroethylene, a soft sealing material.

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