Metal sealing floating ball valve seat assembly and pre-pressing device thereof

Abstract

The utility model relates to a metal seal floating ball valve seat assembly and a prepressing device thereof, the metal seal floating ball valve seat assembly comprises a connecting body, a spring and a valve seat, the inner wall of the connecting body is provided with a first stepped groove and a second stepped groove, the first stepped groove is clamped with the spring, and the second stepped groove is clamped with the valve seat. The second stepped groove is sequentially connected with a clamping ring, a trapezoidal graphite ring and a valve seat in a clamped mode, the clamping ring is in clearance fit with one end of the valve seat, the end, away from the clamping ring, of the valve seat is connected with a ball in a pressed mode, and one end of the connecting body is connected with a valve body in a pressed and sealed mode. The metal sealing floating ball valve seat assembly and the pre-pressing device thereof have the advantages that the installation yield is increased, assembly operation and maintenance are convenient, and the sealing performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of floating ball valve seat components, in particular to a metal sealing floating ball valve seat component and a pre-pressing device thereof. Background Art

[0002] At present, metal-sealed floating ball valves generally use graphite to achieve the seal between the valve seat and the body cover. Due to the influence of factors such as the material and density of the graphite itself, if no measures are taken during operation, the valve seal may leak and it may be easily damaged during disassembly after installation.

[0003] During assembly, after the graphite is installed, the middle flange is locked and the spring force is used to compress and deform the graphite to achieve a sealing effect. This operation is not a big problem for large-sized valves, but the spring force of small-sized valves is insufficient, which can easily lead to the graphite not being pressed down and sealing leakage. This design helps to compress the graphite in advance, which is more conducive to sealing.

[0004] To this end, we have developed a metal-sealed floating ball valve seat assembly and a pre-compression device thereof 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 metal-sealed floating ball valve seat assembly and a pre-pressing device thereof, which has the advantages of improving the installation yield rate, facilitating assembly work, facilitating maintenance, improving sealing performance, and the like.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a metal-sealed floating ball valve seat assembly and its pre-stressing device, including a connecting body, a first step groove and a second step groove are sequentially arranged on the inner wall of the connecting body, the first step groove is clamped with a spring, the second step groove is sequentially clamped with a clamping ring, a trapezoidal graphite ring and a valve seat, the clamping ring and one end of the valve seat are gap-fitted, the end of the valve seat away from the clamping ring is crimped with a ball, and one end of the connecting body is crimped and sealed with a valve body.

[0007] Preferably, the connecting body is further provided with a third stepped groove, and the third stepped groove is arranged on the upper side of the second stepped groove and is crimped with the valve body.

[0008] Preferably, a first annular surface is provided at one end of the valve seat, and the clamping ring is provided with a clamping ring body. The horizontal distance between the clamping ring body and the first annular surface is L, and the distance L>0.

[0009] Preferably, a first conical surface is provided at the top end of the valve seat, a second conical surface is provided at one end of the trapezoidal graphite ring, and the first conical surface is crimped with the second conical surface.

[0010] Preferably, an end ring is provided at one side of the clamping ring body, a second ring surface is provided at one end of the trapezoidal graphite ring, and the end ring is crimped to the second ring surface.

[0011] Preferably, a third annular surface is provided at the other end of the valve seat, a scraper structure is provided at the inner end of the third annular surface, the scraper structure is provided with a coating, and the sphere is crimped to the coating.

[0012] Preferably, one end of the spring is crimped to the clamping ring body, and the other end is horizontally crimped to the first stepped groove.

[0013] A pre-pressing device for the valve seat assembly of the metal sealing floating ball valve comprises a push piece and a positioning plate, wherein the positioning plate is crimped with one end of the connecting body, and the push piece is crimped with the other end of the connecting body and the third annular surface.

[0014] Preferably, a first annular plane is provided at one end of the push member, a first annular groove is provided around the outer wall of the first annular plane, a recessed groove is provided at the center of the first annular plane, and a second annular plane is provided on the outer wall of the first annular groove.

[0015] Preferably, the shortest distance between the first annular plane and the first annular groove is greater than the shortest distance between the second annular plane and the first annular groove.

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

[0017] The utility model discloses a prestressing device for a valve seat assembly of a metal-sealed floating ball valve, in which a push piece pre-tightens a spring through a valve seat, a trapezoidal graphite ring and a clamping ring, thereby improving the installation yield rate; the valve seat assembly is crimped and assembled as a whole, which is convenient for assembly work and maintenance; a prestress is applied to the spring, thereby improving the sealing performance of the scraper structure and the ball coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the valve seat assembly and the pre-pressing device of the metal sealing floating ball valve of the utility model.

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

[0020] Figure 3 It is a structural schematic diagram of the push member of the utility model.

[0021] Figure 4 It is a schematic diagram of the assembly structure of the valve seat assembly of the metal sealing floating ball valve described in the utility model. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Figures 1 to 4 A metal-sealed floating ball valve seat assembly and a pre-stressing device thereof are provided, including a connecting body 1, the inner wall of which is provided with a first step groove 11 and a second step groove 12 in sequence, and the connecting body 1 is also provided with a third step groove 13, the third step groove 13 is arranged on the upper side of the second step groove 12, and is crimped with the valve body 8. The first step groove 11 clamps a spring 2, one end of the spring 2 is crimped with the clamping ring body 31, and the other end of the spring 2 is horizontally crimped with the first step groove 11. The second step groove 12 clamps a clamping ring 3, a trapezoidal graphite ring 4 and a valve seat 5 in sequence, the clamping ring 3 and one end of the valve seat 5 are gap-fitted, the end of the valve seat 5 away from the clamping ring 3 is crimped with a ball 7, and one end of the connecting body 1 is crimped and sealed with a valve body 8. A trapezoidal graphite ring 4 and a valve seat 5 are crimped in sequence between the inner wall on the other side of the valve body 8 and the ball 7, see Figure 4 .

[0024] In order to facilitate the sealing of the front and back and the top of the valve seat, a first ring surface 53 is provided at one end of the valve seat 5, a third ring surface 51 is provided at the other end of the valve seat 5, a first cone surface 52 is provided at the top of the valve seat 5, and the clamping ring 3 is provided with a clamping ring body 31, and an end ring 32 is provided at one side of the clamping ring body 31. The horizontal distance between the clamping ring body 31 and the first ring surface 53 is L, and the distance L>0, thereby improving the preload force of the spring. A second cone surface 41 is provided at one end of the trapezoidal graphite ring 4, and the first cone surface 52 is pressed against the second cone surface 41. A second ring surface 42 is provided at one end of the trapezoidal graphite ring 4, and the end ring 32 is pressed against the second ring surface 42. A scraper structure 54 is provided at the inner end of the third ring surface 51, and the scraper structure 54 is provided with a coating, and the ball 7 is pressed against the coating to improve the sealing performance of the ball.

[0025] In order to improve the sealing performance, a pre-pressing device of a valve seat assembly of a metal-sealed floating ball valve is provided, comprising a push piece 9 and a positioning plate 901, wherein the positioning plate 901 is crimped with one end of a connecting body 1, and the push piece 9 is crimped with the other end of the connecting body 1 and a third annular surface 51. A first annular plane 92 is provided at one end of the push piece 9, a first annular groove 93 is provided around the outer wall of the first annular plane 92, a sink groove 91 is provided at the center of the first annular plane 92, and a second annular plane 94 is provided at the outer wall of the first annular groove 93.

[0026] The shortest distance between the first annular plane 92 and the bottom end of the first annular groove 93 is greater than the shortest distance between the second annular plane 94 and the bottom end of the first annular groove 93, which facilitates the crimping of the connector and the valve body.

[0027] Install the spring 2, the retaining ring 3, the trapezoidal graphite ring 4 and the valve seat 5 into the step groove of the connector 1 in sequence. One end of the connector 1 abuts against the positioning plate 901 and the other end is installed with the push piece 9. Then put the whole body on the press for pre-compression and maintain the pressure for 30S. After the end, remove the push piece 9 and observe the compression of the valve seat. Make sure the whole body is pressed tightly without falling off and then install the whole body into the right valve stem 6, ball 7 and valve body 8 in the original installation order. Then the installation is completed.

[0028] The above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. Any technical solution formed by equivalent transformation or equivalent replacement falls within the protection scope of the utility model.

Claims

1. A metal-sealed floating ball valve seat assembly, characterized in that: The invention comprises a connecting body (1), wherein a first step groove (11) and a second step groove (12) are sequentially arranged on the inner wall of the connecting body (1); the first step groove (11) is clamped with a spring (2); the second step groove (12) is sequentially clamped with a clamping ring (3), a trapezoidal graphite ring (4) and a valve seat (5); the clamping ring (3) and one end of the valve seat (5) are loosely matched; the end of the valve seat (5) away from the clamping ring (3) is crimped with a ball (7); and one end of the connecting body (1) is crimped and sealed with a valve body (8).

2. The metal sealing floating ball valve seat assembly according to claim 1, characterized in that: The connecting body (1) is further provided with a third stepped groove (13), wherein the third stepped groove (13) is arranged on the upper side of the second stepped groove (12) and is press-connected with the valve body (8).

3. The metal sealing floating ball valve seat assembly according to claim 2, characterized in that: A first annular surface (53) is provided at one end of the valve seat (5), and the clamping ring (3) is provided with a clamping ring body (31). The horizontal distance between the clamping ring body (31) and the first annular surface (53) is L, and the distance L>0.

4. The metal sealing floating ball valve seat assembly according to claim 2, characterized in that: A first conical surface (52) is provided at the top end of the valve seat (5), a second conical surface (41) is provided at one end of the trapezoidal graphite ring (4), and the first conical surface (52) is press-connected with the second conical surface (41).

5. The metal sealing floating ball valve seat assembly according to claim 3, characterized in that: An end ring (32) is provided at one side of the clamping ring body (31), a second ring surface (42) is provided at one end of the trapezoidal graphite ring (4), and the end ring (32) is crimped to the second ring surface (42).

6. The metal sealing floating ball valve seat assembly according to claim 3, characterized in that: A third annular surface (51) is provided at the other end of the valve seat (5), a scraper structure (54) is provided at the inner end of the third annular surface (51), the scraper structure (54) is provided with a coating, and the ball (7) is crimped to the coating.

7. The metal sealing floating ball valve seat assembly according to claim 3, characterized in that: One end of the spring (2) is crimped to the clamping ring body (31), and the other end is horizontally crimped to the first stepped groove (11).

8. A pre-pressing device for a valve seat assembly of a metal-sealed floating ball valve according to any one of claims 1 to 7, characterized in that: It comprises a pushing member (9) and a positioning plate (901), wherein the positioning plate (901) is crimped to one end of the connecting body (1), and the pushing member (9) is crimped to the other end of the connecting body (1) and the third annular surface (51).

9. The pre-stressing device of the valve seat assembly of the metal sealing floating ball valve according to claim 8, characterized in that: A first annular plane (92) is provided at one end of the push member (9), a first annular groove (93) is provided around the outer wall of the first annular plane (92), a sink groove (91) is provided at the center of the first annular plane (92), and a second annular plane (94) is provided on the outer wall of the first annular groove (93).

10. The pre-stressing device of the valve seat assembly of the metal sealing floating ball valve according to claim 9, characterized in that: The shortest distance between the first annular plane (92) and the first annular groove (93) is greater than the shortest distance between the second annular plane (94) and the first annular groove (93).

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