Ball valve with novel valve seat sealing structure

Abstract

The utility model relates to a ball valve with a novel valve seat sealing structure, which comprises a special-shaped valve seat, a first sealing ring and a second sealing ring are respectively arranged on two sides of the top end of the special-shaped valve seat, the first sealing ring seals a connecting body in a compression joint manner, the second sealing ring seals a valve body in a compression joint manner, and the valve body is connected with the special-shaped valve seat in a compression joint manner. The bottom end of the special-shaped valve seat is connected with a ball body in a pressing and sealing mode, the connecting body is fixedly connected with the valve body through a bolt, a valve rod is connected with the top end of the valve body in an inserted mode, and the bottom end of the valve rod is connected with the ball body in an inserted mode. The ball valve with the novel valve seat sealing structure has the advantages that the service life is prolonged, the sealing performance is enhanced, and the situation that normal opening and closing cannot be achieved is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of floating ball valves, in particular to a ball valve with a novel valve seat sealing structure. Background Art

[0002] At present, the valve seat is an essential component of the valve. The performance of the valve seat directly affects the sealing performance of the valve, especially in harsh working conditions such as mud. Particles are easily introduced into the back of the conventional valve seat structure, thereby affecting the sealing performance between the valve seat and the body cover as well as the opening and closing performance. Long-term accumulation will cause damage to the valve seat sealing surface and even cause the valve to fail to open and close normally.

[0003] When the medium flows from the right side, debris, mud and other particles in the medium will enter the back of the valve seat, thereby affecting the sealing performance of the valve seat, causing the valve to fail to open and close normally and reducing its service life.

[0004] To this end, we have developed a ball valve with a new valve seat sealing structure to solve the above problems. Utility Model Content

[0005] The utility model aims to overcome the deficiencies of the prior art and to provide a ball valve with a novel valve seat sealing structure, which has the advantages of extending service life, enhancing sealing performance, and avoiding failure to open and close normally.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a ball valve with a new valve seat sealing structure, including a special-shaped valve seat, a first sealing ring and a second sealing ring are respectively provided at both sides of the top of the special-shaped valve seat, the first sealing ring is press-fitted to seal a connector, the second sealing ring is press-fitted to seal a valve body, the bottom end of the special-shaped valve seat is press-fitted to seal a sphere, the connector and the valve body are fixedly connected by bolts, a valve stem is inserted into the top end of the valve body, and the bottom end of the valve stem is inserted into the sphere.

[0007] Preferably, a convex ring is provided at one end of the inner wall of the connector, and the convex ring is press-fitted with one end of the special-shaped valve seat.

[0008] Preferably, a first conical surface is provided on the outer wall of the first sealing ring, an annular groove is provided at one end of the connector, a second conical surface is provided at the top end of the annular groove, and the first conical surface is sealed and crimped with the second conical surface.

[0009] Preferably, a third conical surface is provided on the inner wall of the valve body, and a fourth conical surface is provided on the outer wall of the second sealing ring, and the third conical surface is sealed and pressed with the fourth conical surface.

[0010] Preferably, a convex block is provided at the top end of the special-shaped valve seat, a recessed groove is provided at one end of the inner wall of the valve body, and the convex block is press-fitted with the recessed groove.

[0011] Preferably, a first spherical surface is provided at the bottom end of the special-shaped valve seat, and a second spherical surface is provided on the sphere, and the first spherical surface and the second spherical surface are press-fitted and sealed.

[0012] Preferably, the inner wall of the special-shaped valve seat is flush with the inner wall of the connecting body.

[0013] Preferably, a sliding bearing is press-fitted to the lower portion of the valve stem, and the sliding bearing is press-fitted to the valve body.

[0014] Preferably, the bottom end of the valve stem is plugged into the top end of the sphere and has a clearance fit with the top end of the sphere.

[0015] Preferably, a guide sleeve is sleeved on the outer wall of the valve stem, and the guide sleeve is fixedly connected to the top end of the valve body.

[0016] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0017] The ball valve with a novel valve seat sealing structure described in the utility model has a special-shaped valve seat that can be well used in adverse working conditions such as mud, thereby extending the service life of the valve; it is sealed directly through the conical surface and spherical surface of the special-shaped valve seat, and does not require sealing rings such as sealing rings and graphite, thereby enhancing the sealing performance of the valve; mud and dirt will not be generated on the back of the special-shaped valve seat, avoiding the phenomenon of abnormal opening and closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a ball valve with a novel valve seat sealing structure described in the present utility model.

[0019] Figure 2 For this utility model Figure 1 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 and Figure 2A ball valve with a novel valve seat sealing structure includes a special-shaped valve seat 2. A first sealing ring 22 and a second sealing ring 23 are respectively provided on both sides of the top of the special-shaped valve seat 2. The first sealing ring 22 is press-fitted and sealed with a connector 3, and the second sealing ring 23 is press-fitted and sealed with a valve body 1. The bottom end of the special-shaped valve seat 2 is press-fitted and sealed with a ball 4. The connector 3 and the valve body 1 are fixedly connected by bolts. A valve stem 7 is inserted at the top of the valve body 1, and the bottom end of the valve stem 7 is inserted into the ball 4. In order to seal the special-shaped valve seat and the connector, a first conical surface 221 is provided on the outer wall of the first sealing ring 22, an annular groove 31 is provided at one end of the connector 3, and a second conical surface 311 is provided at the top of the annular groove 31. The first conical surface 221 and the second conical surface 311 are press-fitted and sealed. To ensure a seal between the shaped valve seat and the valve body, the inner wall of the valve body 1 is provided with a third conical surface 12, and the outer wall of the second sealing ring 23 is provided with a fourth conical surface 231. The third conical surface 12 and the fourth conical surface 231 are press-fitted together. The second sealing ring 23 is positioned in the gap between the valve body 1 and the ball 4. A bump 21 is provided at the top of the shaped valve seat 2, and a recess 11 is provided at one end of the inner wall of the valve body 1. The bump 21 press-fits into the recess 11. The left side of the bump 21 abuts against the connector 3. The bottom end of the shaped valve seat 2 is provided with a first spherical surface 24, and the ball 4 is provided with a second spherical surface 41. The first spherical surface 24 and the second spherical surface 41 are press-fitted together to seal. The inner wall of the shaped valve seat 2 and the inner wall of the connector 3 are flush, i.e., they have the same inner diameter, eliminating any gaps or recesses, and preventing silt accumulation. A raised ring 32 is provided at one end of the inner wall of the connector 3, and press-fits into one end of the shaped valve seat 2. A groove 31 is formed on the inner wall of the protruding ring 32 , and a second conical surface 311 is formed at the top end of the groove 31 .

[0022] A sliding bearing 71 is press-fitted to the lower portion of the valve stem 7. A boss is provided at the lower portion of the valve stem 7, which press-fits the sliding bearing 71. The bottom end of the valve stem 7 is inserted into the top end of the sphere 4. A guide sleeve 6 is sleeved on the outer wall of the valve stem 7. The sliding bearing 71 is press-fitted to the valve body 1. A clearance of 45° exists between the valve stem 7 and the top end of the sphere 4. This clearance 45° facilitates rotation of the valve stem. The guide sleeve 6 is press-fitted to the top end of the valve body 1 via a sealing ring and secured with bolts.

[0023] The valve stem rotates through the sliding bearing to open the ball, and the fluid containing mud flows from the through hole of the ball through the connector 3 and finally flows out. The first spherical surface 24 in front of the special-shaped valve seat and the second spherical surface of the ball will produce scratches. The back of the special-shaped valve seat has the same inner diameter as the connector, and mud will not accumulate. The sealing effect between the valve seat and the valve body is improved, and particles are prevented from entering the back of the valve seat, forming a better sealing effect, and expanding the application range and service life of the valve.

[0024] The above are only specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the scope of protection of the present invention.

Claims

1. A ball valve with a new valve seat sealing structure, characterized by: It comprises a special-shaped valve seat (2), wherein a first sealing ring (22) and a second sealing ring (23) are respectively provided at both sides of the top of the special-shaped valve seat (2), the first sealing ring (22) is pressed against the sealing connector (3), the second sealing ring (23) is pressed against the sealing valve body (1), the bottom end of the special-shaped valve seat (2) is pressed against the sealing ball (4), the connector (3) and the valve body (1) are fixedly connected by bolts, the top end of the valve body (1) is plugged into the valve stem (7), and the bottom end of the valve stem (7) is plugged into the ball (4).

2. The ball valve with a novel valve seat sealing structure according to claim 1, characterized in that: A convex ring (32) is provided at one end of the inner wall of the connecting body (3), and the convex ring (32) is press-connected with one end of the special-shaped valve seat (2).

3. The ball valve with a novel valve seat sealing structure according to claim 2, characterized in that: A first conical surface (221) is provided on the outer wall of the first sealing ring (22), an annular groove (31) is provided at one end of the connecting body (3), a second conical surface (311) is provided at the top end of the annular groove (31), and the first conical surface (221) and the second conical surface (311) are sealed and crimped.

4. The ball valve with a novel valve seat sealing structure according to claim 2, characterized in that: A third conical surface (12) is provided on the inner wall of the valve body (1), and a fourth conical surface (231) is provided on the outer wall of the second sealing ring (23), and the third conical surface (12) and the fourth conical surface (231) are sealed and pressed together.

5. The ball valve with a novel valve seat sealing structure according to claim 4, characterized in that: A convex block (21) is provided at the top end of the special-shaped valve seat (2), a recessed groove (11) is provided at one end of the inner wall of the valve body (1), and the convex block (21) is press-fitted with the recessed groove (11).

6. The ball valve with a novel valve seat sealing structure according to claim 2, characterized in that: The bottom end of the special-shaped valve seat (2) is provided with a first spherical surface (24), and the sphere (4) is provided with a second spherical surface (41). The first spherical surface (24) and the second spherical surface (41) are press-fitted and sealed.

7. The ball valve with a novel valve seat sealing structure according to claim 2, characterized in that: The inner wall of the special-shaped valve seat (2) is flush with the inner wall of the connecting body (3).

8. The ball valve with a novel valve seat sealing structure according to claim 1, characterized in that: The lower portion of the valve stem (7) is press-connected with a sliding bearing (71), and the sliding bearing (71) is press-connected with the valve body (1).

9. The ball valve with a novel valve seat sealing structure according to claim 8, characterized in that: The bottom end of the valve stem (7) is plugged into the top end of the sphere (4) and is clearance-matched with the top end of the sphere (4).

10. The ball valve with a novel valve seat sealing structure according to claim 9, characterized in that: The outer wall of the valve stem (7) is sleeved with a guide sleeve (6), and the guide sleeve (6) is fixedly connected to the top end of the valve body (1).

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