Water delivery ball valve structure of subcritical unit

Abstract

The utility model relates to a subcritical unit water delivery ball valve structure which comprises a valve body integrally formed, a valve cavity is formed in the valve body, a mounting hole is formed in the upper end of the valve body, a valve rod is arranged in the mounting hole, and the lower end of the valve rod extends into the valve cavity; sealing packing is arranged between the valve rod and the side wall of the mounting hole, a packing gland is arranged at the upper end of the valve body, and a packing pressing ring is arranged between the packing gland and the sealing packing. And a fixed valve seat is arranged on one side of the valve body. The valve body is of an integrated structure, and the requirement for internal sealing pieces is reduced; the valve ball adopts a floating ball structure and is easier to seal; no other soft sealing structure is arranged outside the sealing filler in the valve, so that the influence of aging of a valve sealing piece is avoided; a thrust ring anti-blow-out structure is arranged in the valve body, so that the use safety is ensured; a metal sealing ring is adopted as a sealing piece and is plated with gold, gold is easy to soften at high temperature, and the valve body and the fixed valve seat are easier to seal through the gold.

Description

Technical Field

[0001] This utility model belongs to the field of ball valve technology, and in particular relates to a structure of a subcritical unit water supply ball valve. Background Technology

[0002] Subcritical unit water supply ball valves are mainly suitable for power plant critical units with operating steam pressures between 15.7 and 19.6 MPa and steam temperatures generally above 538°C. They have significant effects on energy saving and environmental improvement, especially in improving thermal efficiency and reducing environmental pollution. However, subcritical unit water supply ball valves usually operate under high temperature and high pressure conditions, and the medium flowing through them can have a significant impact on the valve's internal seals, such as premature aging. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this utility model provides a subcritical unit water supply ball valve that prevents premature aging of internal valve seals.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0005] A subcritical unit water supply ball valve structure includes:

[0006] The valve body is integrally formed and has a valve cavity inside. The upper end of the valve body has a mounting hole, and a valve stem is installed in the mounting hole. The lower end of the valve stem extends into the valve cavity. A sealing packing is installed between the valve stem and the side wall of the mounting hole. A packing gland is installed at the upper end of the valve body, and a packing pressure ring is installed between the packing gland and the sealing packing. A fixed valve seat is installed on one side of the valve body.

[0007] The valve ball has its upper end connected to the valve stem. One side of the valve ball can cooperate with a fixed valve seat, and a floating valve seat that can cooperate with the valve ball is provided in the valve cavity on the other side of the valve ball. A compensating disc spring is provided between the floating valve seat and the valve body.

[0008] A thrust ring is provided on the valve cavity top wall at the lower end of the mounting hole, and a limit groove is provided at the lower end of the valve stem to cooperate with the limit groove.

[0009] A metal sealing ring is clamped between the valve body and the fixed valve seat, and the surface of the metal sealing ring is gold-plated.

[0010] Preferably, a pressure spring is provided between the packing ring and the packing gland.

[0011] Preferably, the packing gland is connected to the valve body using a connector.

[0012] Preferably, a connection hole is provided on one side of the valve body, and a fixing hole corresponding to the connection hole is provided on the fixed valve seat.

[0013] Preferably, the lower end of the valve stem is provided with a fixing groove.

[0014] Preferably, the lower end of the valve stem is provided with a connecting square post, and the upper end of the valve ball is provided with a connecting square hole that can cooperate with the connecting square post.

[0015] Preferably, the two sides of the metal sealing ring are respectively provided with inwardly tapering inclined surfaces, and the mating surfaces of the valve body and the fixed valve seat are respectively provided with chamfers that can cooperate with the inclined surfaces.

[0016] Preferably, the valve body is provided with a first pipe joint for connecting to an external pipe; the fixed valve seat is provided with a second pipe joint for connecting to an external pipe.

[0017] Compared with the prior art, this utility model has the following advantages:

[0018] The valve body of this utility model adopts an integrated structure, reducing the need for internal seals; the valve ball adopts a floating ball structure, which makes sealing easier; there are no other soft sealing structures outside the sealing packing inside the valve, avoiding the effects of valve seal aging; a thrust ring anti-blowout structure is set in the valve body to ensure safe use; the seal uses a metal sealing ring and is gold-plated. Gold softens easily at high temperatures, and the gold makes it easier to seal between the valve body and the fixed valve seat. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 2 This is a schematic diagram of the valve body and valve stem structure of this utility model.

[0021] Figure 3 This is a schematic diagram of the valve ball structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the metal sealing surface structure of this utility model.

[0023] In the diagram: 1. Valve body; 2. Valve cavity; 3. Mounting hole; 4. Valve stem; 5. Sealing packing; 6. Packing gland; 7. Packing ring; 8. Fixed valve seat; 9. Valve ball; 10. Floating valve seat; 11. Compensating disc spring; 12. Thrust ring; 13. Limiting groove; 14. Metal sealing ring; 15. Pressure spring; 16. Connecting piece; 17. Connecting hole; 18. Fixing hole; 19. Fixing groove; 20. Connecting square post; 21. Connecting square hole; 22. Inclined surface; 23. Chamfer; 24. First pipe joint; 25. Second pipe joint. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0025] This embodiment proposes a subcritical unit water supply ball valve structure, including valve body 1, valve ball 9, thrust ring 12 and metal sealing ring 14;

[0026] like Figures 1-4 As shown, the valve body 1 is integrally formed. The integrally formed valve body 1 can reduce the use of seals and avoid internal leakage of the valve due to aging of the seals.

[0027] The valve body 1 has a valve cavity 2 inside, and a mounting hole 3 is provided at the upper end of the valve body 1. A valve stem 4 is provided in the mounting hole 3, and the lower end of the valve stem 4 extends into the valve cavity 2. The valve stem 4 is used to control the rotation of the valve ball 9.

[0028] A sealing packing 5 is provided between the valve stem 4 and the side wall of the mounting hole 3. A packing gland 6 is provided at the upper end of the valve body 1. A packing ring 7 is provided between the packing gland 6 and the sealing packing 5. The sealing packing 5 prevents the medium from leaking between the valve stem 4 and the valve body 1, and the packing ring 7 prevents the packing from running out.

[0029] A fixed valve seat 8 is provided on one side of the valve body 1, and the fixed valve seat 8 plays a role in fixing the valve ball;

[0030] The upper end of the valve ball 9 is connected to the valve stem 4. One side of the valve ball 9 can cooperate with the fixed valve seat 8. The valve cavity 2 on the other side of the valve ball 9 is provided with a floating valve seat 10 that can cooperate with the valve ball 9. A compensating disc spring 11 is provided between the floating valve seat 10 and the valve body 1. The presence of the compensating disc spring 11 and the floating valve seat 10 makes the valve ball 9 a floating structure.

[0031] A limiting groove 13 is provided on the top wall of the valve cavity 2 at the lower end of the mounting hole 3. A thrust ring 12 that can cooperate with the limiting groove 13 is provided at the lower end of the valve stem 4. The thrust ring 12 prevents the valve stem 4 from running out of the valve body 1.

[0032] The metal sealing ring 14 is clamped between the valve body 1 and the fixed valve seat 8. The surface of the metal sealing ring 14 is gold-plated. Since gold is a highly stable metal, it is easy to soften at high temperatures, so it is easier to seal between metals through gold.

[0033] Furthermore, a pressure spring 15 is provided between the packing ring 7 and the packing cap 6. The pressure spring 15 is used to press the packing ring 7 tightly and has a certain compensation effect.

[0034] Furthermore, the packing gland 6 is connected to the valve body 1 via a connector 16, which is a connecting bolt, facilitating installation and disassembly.

[0035] Furthermore, a connecting hole 17 is provided on one side of the valve body 1, and a fixing hole 18 corresponding to the connecting hole 17 is provided on the fixed valve seat 8. The connecting hole 17 is a threaded hole, and connecting bolts can be installed in the connecting hole 17 and the fixing hole 18 to fix the valve body 1 and the fixed valve seat 8.

[0036] Furthermore, a fixing groove 19 is provided at the lower end of the valve stem 4, and the thrust ring is fitted into the fixing groove 19.

[0037] Furthermore, the lower end of the valve stem 4 is provided with a connecting square post 20, and the upper end of the valve ball 9 is provided with a connecting square hole 21 that can cooperate with the connecting square post 20, and the connecting square post 20 is inserted into the connecting square hole 21.

[0038] Furthermore, the metal sealing ring 14 has inwardly contracting inclined surfaces 22 on both sides, and the valve body 1 and the fixed valve seat 8 have chamfers 23 that can cooperate with the inclined surfaces 22. The cooperation between the inclined surfaces 22 and the chamfers 23 makes the sealing effect better.

[0039] Furthermore, the valve body 1 is provided with a first pipe joint 24 for connecting to an external pipe; the fixed valve seat 8 is provided with a second pipe joint 25 for connecting to an external pipe, and the first pipe joint 24 and the second pipe joint 25 facilitate the connection of the valve to the external pipe.

[0040] Working principle: This utility model reduces the number of internal valve seals by using an integrated valve body 1, and adds a metal sealing ring 14 between the valve body 1 and the fixed valve seat 8 to improve the overall sealing effect of the valve. This ensures that there are no other soft sealing structures besides the sealing packing at the valve, thus avoiding the problem of easy aging of the internal seal of the valve.

[0041] It is understood that the above embodiments are merely exemplary models used to illustrate the principles of this utility model, and this utility model is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of this utility model, and these modifications and improvements are also considered to be within the protection scope of this utility model.

Claims

1. A subcritical unit water supply ball valve structure, characterized in that it comprises: The valve body (1) is integrally formed. A valve cavity (2) is provided inside the valve body (1). An installation hole (3) is provided at the upper end of the valve body (1). A valve stem (4) is provided in the installation hole (3). The lower end of the valve stem (4) extends into the valve cavity (2). A sealing packing (5) is provided between the valve stem (4) and the side wall of the installation hole (3). A packing gland (6) is provided at the upper end of the valve body (1). A packing pressure ring (7) is provided between the packing gland (6) and the sealing packing (5). A fixed valve seat (8) is provided on one side of the valve body (1). The upper end of the valve ball (9) is connected to the valve stem (4). One side of the valve ball (9) can cooperate with the fixed valve seat (8). The valve cavity (2) on the other side of the valve ball (9) is provided with a floating valve seat (10) that can cooperate with the valve ball (9). A compensating disc spring (11) is provided between the floating valve seat (10) and the valve body (1). A thrust ring (12) is provided on the top wall of the valve cavity (2) at the lower end of the mounting hole (3), and a limit groove (13) is provided on the lower end of the valve stem (4) to cooperate with the limit groove (13). Metal sealing ring (14) is sandwiched between valve body (1) and fixed valve seat (8), and the surface of metal sealing ring (14) is gold plated.

2. The subcritical unit water supply ball valve structure according to claim 1, characterized in that, A pressure spring (15) is provided between the packing pressure ring (7) and the packing pressure cap (6).

3. The subcritical unit water supply ball valve structure according to claim 1, characterized in that, The packing gland (6) is connected to the valve body (1) via a connector (16).

4. The structure of a subcritical unit water supply ball valve according to claim 1, characterized in that, A connection hole (17) is provided on one side of the valve body (1), and a fixing hole (18) corresponding to the connection hole (17) is provided on the fixed valve seat (8).

5. The structure of a subcritical unit water supply ball valve according to claim 1, characterized in that, The lower end of the valve stem (4) is provided with a fixing groove (19).

6. The structure of a subcritical unit water supply ball valve according to claim 1, characterized in that, The lower end of the valve stem (4) is provided with a connecting square post (20), and the upper end of the valve ball (9) is provided with a connecting square hole (21) that can cooperate with the connecting square post (20).

7. The structure of a subcritical unit water supply ball valve according to claim 1, characterized in that, The metal sealing ring (14) has inwardly contracting inclined surfaces (22) on both sides, and the valve body (1) and the fixed valve seat (8) have chamfers (23) that can cooperate with the inclined surfaces (22) at their mating surfaces.

8. The structure of a subcritical unit water supply ball valve according to claim 1 or 7, characterized in that, The valve body (1) is provided with a first pipe joint (24) for connecting to an external pipe; the fixed valve seat (8) is provided with a second pipe joint (25) for connecting to an external pipe.

Images