A ball valve seat and ball valve

Abstract

The utility model relates to a ball valve valve seat and ball valve, the valve seat is installed in the valve seat hole of valve body through the spring, the valve seat includes: the limiting step is around the outer wall of valve seat and sets up, the limiting block is fixed in the valve body, and has a convex part and extends into the space of valve seat hole, wherein, the limiting block blocks the limiting step and the space that surrounds in the limiting block and the valve seat hole axial movement, the utility model guarantees the close adhesion of valve seat and ball core, reduces the local contact phenomenon of sealing pair, eliminates the local contact stress, avoids the valve jam problem, can also guarantee that the sealing pair of valve is not easy to damage, guarantees the cooperation accuracy of sealing pair.

Description

Technical Field

[0001] This utility model relates to the field of valves, specifically to a ball valve seat and a ball valve. Background Technology

[0002] Ball valves are widely used in various industries and need to cope with very complex working conditions. The core function of ball valves is to connect and disconnect pipelines. As a key valve for pipeline on / off control, the smooth opening or closing of the valve is the foundation for ensuring the stable operation of various devices.

[0003] One of the biggest problems with ball valves currently is that they can jam during opening or closing, especially in applications requiring rapid switching, frequent load changes, or gaseous media. Jamming is the most common and dangerous problem with ball valves. If jamming occurs, it can lead to anything from incomplete closure or damaged seals to valve stem breakage, ultimately causing system instability, equipment failure, or emergency shutdowns.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model discloses a ball valve seat and a ball valve.

[0006] The technical solution adopted in this embodiment of the utility model is as follows:

[0007] A ball valve seat is mounted in a seat hole of a valve body by a spring; the seat includes: a limiting step surrounding the outer wall of the seat; a limiting block fixed to the valve body and having a protruding portion extending into the space of the seat hole; wherein the limiting block prevents the limiting step from axially moving in the space enclosed by the limiting block and the seat hole.

[0008] A further technical solution is that a ball core is installed in the valve body; during the movement of the valve seat, the valve seat supports the ball core and fits tightly against the ball core.

[0009] A further technical solution is that the limiting block is fixed to the end face of the valve body; the end face is close to the space used to install the ball core.

[0010] A further technical solution is that multiple limiting blocks are provided and fixed at even intervals on the end face of the valve body; or, the limiting blocks are annular.

[0011] A further technical solution is that, when the ball valve is in a fully closed or fully open state, there is no gap between the limiting block and the limiting step.

[0012] A further technical solution is that the valve seat includes a spring mounting groove for fixing the spring; a cleaning port communicating with the flow channel of the ball valve is provided on the spring mounting groove.

[0013] A further technical solution is that at least one sealing ring is installed between the outer wall of the valve seat and the inner wall of the valve seat hole.

[0014] A ball valve equipped with a ball valve seat as described in any of the preceding claims, characterized in that the valve body comprises a main valve body and a side valve body; a ball core is installed in the main valve body; two side valve bodies are respectively fixed on both sides of the main valve body and form a flow channel; the valve seat is installed in the valve seat hole of the side valve body, and the limiting block is fixed on the end face of the side valve body.

[0015] A further technical solution is that a valve stem fixed above the ball core and a bottom shaft fixed below the ball core are also installed on the main valve body.

[0016] A further technical solution is that a stuffing box is fixed above the main valve body; the inner wall of the stuffing box and the valve stem are filled with stuffing, and a stuffing sleeve and a stuffing cap are sequentially covered.

[0017] The beneficial effects of this utility model embodiment are as follows:

[0018] This invention features a limiting block fixed on the valve body and a limiting step on the valve seat. This limits the axial movement of the valve seat and, when the valve seat is not offset in the axial direction, also prevents the overall offset of the valve seat axis during the valve opening and closing process. This ensures a tight fit between the valve seat and the ball core, reduces local contact between the sealing pairs, eliminates local contact stress, avoids valve jamming, and prevents damage to the valve sealing pairs, thus ensuring the fitting accuracy of the sealing pairs.

[0019] This embodiment of the utility model also provides a cleaning port on the spring mounting groove, so that the medium particles that enter the spring mounting groove can be freely discharged, eliminating the influence on the spring, ensuring the spring is in good working condition, avoiding the spring from being unable to compress due to the influence of medium particles, thereby ensuring smooth valve operation, preventing jamming, improving valve sealing performance and operation performance, and increasing valve service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the ball valve in an embodiment of this utility model.

[0021] Figure 2yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0022] Figure 3 This is a schematic diagram of a ball valve without a limit switch in one of its rotational positions.

[0023] Figure 4 This is a schematic diagram of the ball valve in one rotational position according to an embodiment of the present invention.

[0024] Figure 5 This is a schematic diagram of the ball valve from another direction in an embodiment of this utility model.

[0025] In the diagram: 1. Valve seat; 101. Limiting step; 102. Limiting block; 103. Cleaning port; 2. Valve body; 201. Valve seat hole; 202. Main valve body; 203. Side valve body; 3. Ball core; 4. Spring; 5. Flow channel; 6. Sealing ring; 7. Valve stem; 8. Bottom shaft; 9. Stuffing box; 10. Packing; 11. Packing gland; 12. Packing gland. Detailed Implementation

[0026] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the device proposed by this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer according to the following description. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, only used to conveniently and clearly assist in illustrating the purpose of the embodiments of this utility model. Please refer to the accompanying drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification, for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0028] Figure 1 This is a schematic diagram of the ball valve in an embodiment of this utility model. Figure 2 yes Figure 1 An enlarged diagram of part A in the diagram. (See attached image.) Figure 1 , Figure 2As shown, this embodiment of the present invention discloses a ball valve seat. The valve seat 1 is mounted in the valve seat hole 201 of the valve body 2 by a spring 4. The valve seat 1 is used to support the ball core 3 of the ball valve. The valve seat hole 201 is formed in the inner wall of the valve body 2. Here and elsewhere in this document, the inner wall refers to the structure closer to the flow channel 5 in the ball valve, while the outer wall refers to the structure relatively farther away from the flow channel 5. The valve seat 1 includes a limiting step 101 and a limiting block 102.

[0029] A limiting step 101 is provided around the outer wall of the valve seat 1. A limiting block 102 is fixed to the valve body 2 and has a protruding portion extending into the space of the valve seat hole 201. This allows the limiting block 102 to block the limiting step 101, so that the valve seat 1 can move axially within the space enclosed by the limiting block 102 and the valve seat hole 201. Here, axial refers to the direction along the central axis of the valve seat 1.

[0030] Furthermore, the limiting block 102 is specifically fixed to the end face of the valve body 2, which is close to the space used to install the ball core 3.

[0031] Furthermore, multiple limit blocks 102 can be provided on a valve seat 1, and fixed to the end face of the valve body 2 by screws at evenly spaced intervals. The specific number of limit blocks 102 can be selectively set according to different valve sizes. Alternatively, the limit blocks 102 can be configured as a ring to restrict the movement of the valve seat 1 as a whole.

[0032] Specifically, at least one sealing ring 6 is installed between the outer wall of the valve seat 1 and the inner wall of the valve seat bore 201. In the embodiment shown in the figure, two sealing rings 6 are installed.

[0033] Since valve seat 1 is mounted in valve seat hole 201 by spring 4 and supports ball core 3, when ball core 3 rotates, valve seat 1 adjusts its position in valve seat hole 201 according to the rotation of ball core 3. Furthermore, during the movement of valve seat 1, valve seat 1 and ball core 3 are in close contact. That is, by adjusting the size of limiting step 101, it is ensured that valve seat 1 can be in contact with ball core 3, while ensuring that the movement distance of valve seat 1 in the axial direction can be effectively limited.

[0034] Figure 3 This is a schematic diagram of a ball valve in one rotational position without a limit switch. Figure 3As shown, valve seat 1 is installed in valve seat hole 201. Valve seat 1 needs to move axially along flow channel 5, so sufficient clearance needs to be maintained between the outer wall of valve seat 1 and the inner wall of valve seat hole 201. During valve opening and closing, due to this clearance and the uneven force exerted on valve seat 1 by ball core 3 during rotation, valve seat 1 will exhibit axial offset. In the embodiment shown in the figure, the force on valve seat 1 is uneven, with the lower part contacting ball core 3 while the upper part does not. This causes the lower part of valve seat 1 to offset in the direction indicated by arrow B, resulting in an overall offset of the axis of valve seat 1, that is, the axis of valve seat 1 deviates from the axis of valve body 2. This causes the contact surfaces of valve seat 1 and ball core 3 to no longer be in complete contact, but only partially in contact, resulting in poor sealing, contact stress in local contact, leading to valve jamming, scratches on the sealing surface, and leakage. Here, the sealing surface refers to the valve seat 1 and ball core 3, which cooperate to achieve the sealing function in the ball valve sealing structure.

[0035] Figure 4 This is a schematic diagram of the ball valve in one rotational position according to an embodiment of the present invention. Figure 3 Compared to the situation shown, such as Figure 4 As shown, in this embodiment, the limiting block 102 restricts the movement distance of the valve seat 1 in the axial direction on the one hand, and on the other hand, when the valve seat 1 is not offset in the axial direction, it also restricts the problem of the overall offset of the axis of the valve seat 1 during the valve opening and closing process. This can reduce the local contact of the sealing pair, eliminate local contact stress, ensure that the valve sealing pair is not easily damaged, and ensure the fitting accuracy of the sealing pair.

[0036] Furthermore, ideally, when the ball valve is fully closed or fully open, there is no gap, or only a very small and negligible gap, between the limiting block 102 and the limiting step 101. This allows the valve seat 1 to be limited even when it has only a small displacement or a tendency to displace, ensuring that the axis of the valve seat 1 is almost not offset.

[0037] Furthermore, the valve seat 1 also includes a spring mounting groove for fixing the spring 4. One end of the spring 4 is fixed in the spring mounting groove, and the other end of the spring 4 is fixed in the valve seat hole 201, so that the valve seat 1 can be displaced in the axial direction and tightly fits against the ball core 3 during the rotation of the ball core 3. A cleaning port 103 communicating with the flow channel 5 of the ball valve is provided on the spring mounting groove. Preferably, it is installed at the bottom of the spring mounting groove, so that the medium particles entering the spring mounting groove can be freely discharged, eliminating the influence on the spring 4, ensuring the proper working condition of the spring 4, and avoiding the spring from being unable to compress due to the influence of medium particles, thereby ensuring smooth valve operation, preventing jamming, improving valve sealing performance and operating performance, and increasing valve service life.

[0038] Figure 5 This is a schematic diagram of the ball valve from another direction in an embodiment of this utility model. (See diagram below.) Figure 1 , Figure 2 and Figure 5 As shown, this embodiment also discloses a ball valve equipped with a ball valve seat as described in the above embodiment. The valve body 2 includes a main valve body 202 and two side valve bodies 203. A ball core 3 is installed in the main valve body 202. The two side valve bodies 203 are respectively fixed to both sides of the main valve body 202 and form a flow channel 5. A valve seat 1 is installed in the side valve body 203, and a limiting block 102 is fixed to the end face of the side valve body 203. Of course, in other feasible embodiments, the main valve body 202 and the side valve bodies 203 can also be an integral structure.

[0039] The main valve body 202 is also equipped with a valve stem 7 fixed above the ball core 3 and a bottom shaft 8 fixed below the ball core 3.

[0040] A stuffing box 9 is also fixed above the main valve body 202 for sealing the valve stem 7. The space between the inner wall of the stuffing box 9 and the valve stem 7 is filled with packing 10 and covered by a packing gland 11 and a packing cap 12. The packing cap 12 and the stuffing box 9 are fixed together by studs, nuts or similar fasteners.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A ball valve seat, characterized in that, The valve seat (1) is mounted in the valve seat hole (201) of the valve body (2) by means of a spring (4); the valve seat (1) includes: A limiting step (101) is provided around the outer wall of the valve seat (1); The limiting block (102) is fixed to the valve body (2) and has a protruding portion that extends into the space of the valve seat hole (201); The limiting block (102) blocks the limiting step (101) so that the valve seat (1) can move axially in the space enclosed by the limiting block (102) and the valve seat hole (201).

2. The ball valve seat according to claim 1, characterized in that, A ball core (3) is installed in the valve body (2); during the movement of the valve seat (1), the valve seat (1) supports the ball core (3) and fits tightly with the ball core (3).

3. The ball valve seat according to claim 1, characterized in that, The limiting block (102) is fixed to the end face of the valve body (2); the end face is close to the space for installing the ball core (3).

4. The ball valve seat according to claim 3, characterized in that, Multiple limiting blocks (102) are provided and are fixed at even intervals on the end face of the valve body (2); or, the limiting blocks (102) are annular.

5. The ball valve seat according to claim 1, characterized in that, When the ball valve is in a fully closed or fully open state, there is no gap between the limiting block (102) and the limiting step (101).

6. The ball valve seat according to claim 1, characterized in that, The valve seat (1) includes a spring mounting groove for fixing the spring (4); a cleaning port (103) is provided on the spring mounting groove to communicate with the flow channel (5) of the ball valve.

7. The ball valve seat according to claim 1, characterized in that, At least one sealing ring (6) is installed between the outer wall of the valve seat (1) and the inner wall of the valve seat hole (201).

8. A ball valve equipped with a ball valve seat as described in any one of claims 1 to 7, characterized in that, The valve body (2) includes a main valve body (202) and a side valve body (203); a ball core (3) is installed in the main valve body (202); the two side valve bodies (203) are respectively fixed on both sides of the main valve body (202) and form a flow channel (5); the valve seat (1) is installed in the valve seat hole (201) of the side valve body (203), and the limiting block (102) is fixed on the end face of the side valve body (203).

9. The ball valve according to claim 8, characterized in that, A valve stem (7) fixed above the ball core (3) and a bottom shaft (8) fixed below the ball core (3) are also installed on the main valve body (202).

10. The ball valve according to claim 9, characterized in that, A stuffing box (9) is fixed above the main valve body (202); the inner wall of the stuffing box (9) and the valve stem (7) are filled with packing (10), and are covered by a packing sleeve (11) and a packing gland (12) in sequence.

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