Valve seat assembly and forged steel all-welded fixed ball valve

Abstract

The utility model relates to the technical field of valves, in particular to a valve seat assembly and a forged steel all-welded fixed ball valve.The valve assembly comprises a valve seat support, a first cavity, a first clamping groove and a first matching groove are formed in the valve seat support, a sealing ring is contained in the first cavity, a valve seat pressing ring is contained in the first clamping groove, the valve seat pressing ring abuts against the sealing ring, and the first matching groove is matched with the first cavity. A gap a is formed between the valve seat pressing ring and the first clamping groove, a cylindrical pin is arranged in the first matching groove, and the end, used for making contact with the ball, of the sealing ring is a first end. When the movement of the valve seat pressing ring in the width direction of the valve seat pressing ring is adjusted so that the gap a can be reduced, the sealing ring extends in the direction close to the first end under the extrusion action of the inner wall of the first cavity and the valve seat pressing ring. According to the valve seat assembly and the forged steel all-welded fixed ball valve, the service life of the sealing ring can be prolonged, and after the sealing ring is abraded, the sealing performance of the ball body and the valve seat can be maintained or slowed down on the basis that valve seat parts are not replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a valve seat assembly and a forged steel fully welded fixed ball valve. Background Art

[0002] As a key control element in the fluid delivery system, the sealing performance of the valve is directly related to the safety, reliability and operating efficiency of the system. The valve seat seal is one of the core components to achieve the valve sealing function. It is usually supported by rubber materials and is usually installed on the valve seat or valve body to form a sealing pair with the ball.

[0003] For fully welded trunnion-mounted ball valves, in actual applications, valve seat seal wear is one of the main causes of valve leakage, performance degradation, and even failure, especially under harsh working conditions such as frequent opening and closing, high pressure difference, or high-speed fluid.

[0004] The common arrangement of valve seats and sealing rings is as follows: Figure 1 As shown, after the sealing ring is gradually worn, the preload force of its coil spring will gradually decrease, so that the extrusion force between the sealing ring and the ball will decrease, thus reducing the sealing performance between the ball and the valve seat; however, after the sealing ring is worn, when the sealing performance between the ball and the valve seat does not meet the use requirements, it is usually necessary to replace the valve seat or the sealing ring, thus increasing the consumption of the valve seat or the sealing ring and the use cost of the valve during use.

[0005] Therefore, how to maintain or slow down the sealing performance between the ball and the valve seat after the sealing ring is worn without replacing the valve seat parts is a technical problem that urgently needs to be solved. Utility Model Content

[0006] The purpose of the utility model is to provide a valve seat assembly and a forged steel fully welded fixed ball valve in view of the above-mentioned shortcomings of the current valve seat in actual use, so as to achieve the purpose of maintaining or reducing the sealing performance of the ball and the valve seat without replacing the valve seat parts after the sealing ring is worn.

[0007] In order to achieve the above-mentioned utility model purpose, the utility model provides the following technical solutions:

[0008] A valve seat assembly, comprising a valve seat support, the valve seat support is provided with a first chamber, a first groove and a first matching groove, the first chamber accommodates a sealing ring, the sealing ring is made of rubber material, the first groove accommodates a valve seat pressure ring, the valve seat pressure ring abuts against the sealing ring, a gap a is formed between the side of the valve seat pressure ring facing the sealing ring and the first groove, the gap a≠0, a cylindrical pin is provided in the first matching groove, the cylindrical pin is used to limit the movement of the valve seat pressure ring in its radial direction and adjust the movement of the valve seat pressure ring in its width direction, and the end of the sealing ring for contacting with the ball is the first end;

[0009] When the movement of the valve seat pressure ring along its width direction is adjusted to reduce the gap a, the sealing ring is squeezed by the inner wall of the first chamber and the valve seat pressure ring so that the sealing ring extends toward the first end.

[0010] As a preferred technical solution of the present application, a first inclined surface is formed in the first chamber, and the first inclined surface is used to guide the sealing ring to extend toward the direction close to the first end when the gap a is reduced.

[0011] As a preferred technical solution of the present application, the cross-sectional shape of the sealing ring is a triangle, and the first end is located at the end of the triangular cross-section of the sealing ring.

[0012] As a preferred technical solution of the present application, a limiting step is provided on the cylindrical pin, and the limiting step is used to abut against a side of the valve seat pressure ring away from the sealing ring.

[0013] As the priority technical solution of the present application, the cylindrical pin is provided with an external thread, and the first mating groove is provided with an internal thread. The cylindrical pin and the first mating groove are threadedly mated through the internal and external threads so that the cylindrical pin can adjust its position along the length direction of the first mating groove.

[0014] As a preferred technical solution of the present application, a sealing assembly is further provided on the valve seat support, and the sealing assembly is used to abut against the inner wall of the valve body so that the sealing assembly cooperates with the valve body to form a sealing pair.

[0015] As a preferred technical solution of the present application, the sealing assembly includes a graphite rope and / or an O-ring, and the O-ring is made of an elastic rubber material.

[0016] As a preferred technical solution of the present application, the valve seat support includes a valve seat body and a first base, the first base is slidably arranged on the valve seat body, the cylindrical pin is internally threadedly connected with a secondary pin, the secondary pin is used to abut against the first base, and the side of the first base away from the secondary pin is used to abut against the coil spring;

[0017] By rotating the auxiliary pin relative to the cylindrical pin, the auxiliary pin is enabled to push the first base to move relative to the valve seat body along the length direction of the first fitting groove, and the moving direction of the first base relative to the valve seat body is the same as the length direction of the helical spring.

[0018] The utility model further provides a forged steel fully welded fixed ball valve, including the valve seat assembly as described above.

[0019] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0020] 1. In the solution of the present application, after the sealing ring is worn and the sealing performance between the sphere and the valve seat fails to meet the usage requirements, by disassembling the valve and adjusting the movement of the valve seat pressing ring along its width direction, the gap a is reduced, so that the sealing ring is stretched towards the direction close to the first end under the extrusion of the inner wall of the first chamber and the valve seat pressing ring, thereby compensating for the worn part on the sealing ring, increasing the pre-tightening force of the helical spring in this way, enabling the pre-tightening force of the helical spring at this time to reach or approach the pre-tightening force when the sealing ring is not worn. Thus, the service life of the sealing ring can be prolonged, the replacement frequency of the valve seat or the sealing ring can be reduced, and the usage cost during the use of the valve can be reduced, so as to achieve the purpose of maintaining or slowing down the sealing performance between the sphere and the valve seat without replacing the valve seat parts after the sealing ring is worn;

[0021] 2. Further, by providing the first inclined surface, when the sealing ring is extruded by the inner wall of the first chamber and the valve seat pressing ring, the first inclined surface plays a guiding role to guide the sealing ring to stretch towards the direction close to the first end;

[0022] 3. Further, after the cylindrical pin and the first fitting groove are in threaded fit through internal and external threads, by rotating the cylindrical pin relative to the first fitting groove around its own central axis, the cylindrical pin can move relative to the first fitting groove along the length direction of the first fitting groove, thereby adjusting the position of the cylindrical pin in the length direction of the first fitting groove, so as to facilitate the reduction of the gap a and thus facilitate the stretching of the sealing ring towards the direction close to the first end;

[0023] 4. Further, by providing the auxiliary pin, the auxiliary pin is in threaded connection with the cylindrical pin, so that when the auxiliary pin rotates relative to the cylindrical pin around its own central axis, the auxiliary pin can move relative to the cylindrical pin along the length direction of the cylindrical pin. On the premise that the cylindrical pin is fixed relative to the valve seat body, by rotating the auxiliary pin relative to the cylindrical pin, the auxiliary pin moves along the length direction of the cylindrical pin, so that the first base can be pushed to move relative to the valve seat body, thereby further adjusting the pre-tightening force of the helical spring. Furthermore, when the pre-tightening force of the helical spring is reduced due to the wear of the sealing ring, this adjustment method can further increase the pre-tightening force of the helical spring, thereby further improving the sealing performance between the sphere and the valve seat. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of a common valve seat and sealing ring in the prior art;

[0025] Figure 2 It is a schematic structural diagram of one embodiment of a valve seat assembly in the present application;

[0026] Figure 3 It is a schematic partial structural diagram of one embodiment of a valve seat assembly in the present application;

[0027] Figure 4 It is a schematic partial structural diagram of one embodiment of a valve seat assembly in the present application at the valve seat pressing ring;

[0028] Figure 5 It is a schematic structural diagram of a valve seat assembly in one embodiment of the present application when the cylindrical pin and the secondary pin are in a threaded fit state;

[0029] Figure 6 It is a schematic structural diagram of the cylindrical pin and the secondary pin in one embodiment of a valve seat assembly in the present application;

[0030] Figure 7 It is a schematic structural diagram of a special screwdriver for screwing the cylindrical pin or the secondary pin in one embodiment of a valve seat assembly in the present application;

[0031] Figure 8 It is a schematic structural diagram of one embodiment of a forged steel fully welded fixed ball valve in the present application;

[0032] Reference numerals in the drawings: 101 - main sealing ring, 102 - main valve seat, 103 - main valve seat pressing ring, 104 - main helical spring;

[0033] 1 - valve seat support, 2 - first chamber, 3 - first card slot, 4 - first mating slot, 5 - sealing ring, 6 - valve seat pressing ring, 7 - cylindrical pin, 8 - first end, 9 - first inclined surface, 10 - limiting step, 11 - second card slot, 12 - sealing assembly, 13 - graphite rope, 14 - O - ring, 15 - valve seat body, 16 - first base, 17 - secondary pin, 18 - third card slot;

[0034] 201 - part of the screwdriver, 202 - part two of the screwdriver, 203 - part one of the handle, 204 - part one of the fit, 205 - part two of the handle, 206 - part two of the fit. Detailed Description of the Invention

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present utility model.

[0036] Therefore, the following detailed description of the embodiments of the present utility model is not intended to limit the scope of the present utility model claimed, but merely represents some embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0037] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments may be combined with each other.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0039] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, terms such as "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0040] Embodiment 1: A valve seat assembly provided in this embodiment is shown in Figures 2 - 6 Figure 1, and includes a valve seat support 1. A first chamber 2, a first card slot 3, and a first mating slot 4 are provided on the valve seat support 1. The first chamber 2 houses a sealing ring 5, which is made of rubber material. The first card slot 3 houses a valve seat pressing ring 6, and the valve seat pressing ring 6 abuts against the sealing ring 5. A gap a is formed between the side of the valve seat pressing ring 6 facing the sealing ring 5 and the first card slot 3, and the gap a ≠ 0. A cylindrical pin 7 is provided in the first mating slot 4. The cylindrical pin 7 is used to limit the movement of the valve seat pressing ring 6 in its radial direction and adjust the movement of the valve seat pressing ring 6 in its width direction. The end of the sealing ring 5 for contacting the sphere is a first end 8;

[0041] When the movement of the valve seat pressure ring 6 along its width direction is adjusted to reduce the gap a, the sealing ring 5 is squeezed by the inner wall of the first chamber 2 and the valve seat pressure ring 6 so that the sealing ring 5 extends toward the first end 8.

[0042] In the present application, after the sealing ring 5 is worn and the sealing performance between its ball and the valve seat does not meet the use requirements, the valve is disassembled and the movement of the valve seat pressure ring 6 along its width direction is adjusted to reduce the gap a, so that the sealing ring 5 stretches toward the first end 8 under the extrusion of the inner wall of the first chamber 2 and the valve seat pressure ring 6, thereby compensating for the worn part of the sealing ring 5, thereby increasing the preload force of the coil spring, so that the preload force of the coil spring at this time can reach or approach the preload force of the sealing ring 5 when the sealing ring 5 is not worn. In this way, the service life of the sealing ring 5 can be extended, the replacement frequency of the valve seat or the sealing ring 5 can be reduced, and the use cost of the valve during use can be reduced, so as to achieve the purpose of maintaining or slowing down the sealing performance of the ball and the valve seat after the sealing ring 5 is worn without replacing the valve seat parts.

[0043] Attached Figure 1 It is a common arrangement structure diagram of the valve seat and sealing ring in the current prior art, wherein the main sealing ring 101 is installed on the main valve seat 102, the main valve seat pressure ring 103 limits the main sealing ring 101, one end of the main coil spring 104 is against the valve body, and the other end is against the main valve seat 102.

[0044] As a preferred embodiment, based on the above-mentioned manner, further, a first inclined surface 9 is formed in the first chamber 2, and the first inclined surface 9 is used to guide the sealing ring 5 to extend toward the direction close to the first end 8 when the gap a is reduced.

[0045] Furthermore, by providing the first inclined surface 9 , when the sealing ring 5 is squeezed by the inner wall of the first chamber 2 and the valve seat pressure ring 6 , the first inclined surface 9 plays a guiding role so as to guide the sealing ring 5 to extend toward the direction close to the first end 8 .

[0046] As a preferred implementation, based on the above implementation, further, the cross-sectional shape of the sealing ring 5 is a triangle, and the first end 8 is located at the end of the triangular cross-section of the sealing ring 5 .

[0047] Furthermore, by arranging the first end 8 at the end of the triangular cross section of the sealing ring 5, the end can generate a higher local contact stress when under pressure, so that the sealing ring 5 can fit the ball tightly, thereby improving the sealing performance between the ball and the valve seat.

[0048] As a preferred embodiment, on the basis of the above-described manner, further, a limiting step 10 is provided on the cylindrical pin 7, and the limiting step 10 is used to abut against the side of the valve seat pressing ring 6 away from the sealing ring 5.

[0049] Further, by providing the limiting step 10, the side of the valve seat pressing ring 6 away from the sealing ring 5 abuts against the limiting step 10. Thus, when adjusting the position of the cylindrical pin 7 relative to the first fitting groove 4 along the length direction of the first fitting groove 4, the limiting step 10 is used to push the valve seat pressing ring 6 to move, so as to facilitate reducing the gap a, and further facilitating the sealing ring 5 to extend toward the direction close to the first end 8.

[0050] As a preferred embodiment, on the basis of the above-described manner, further, an external thread is provided on the cylindrical pin 7, and an internal thread is provided on the first fitting groove 4. The cylindrical pin 7 and the first fitting groove 4 are threadedly engaged through the internal and external threads, so that the cylindrical pin 7 can adjust its position along the length direction of the first fitting groove 4.

[0051] Further, after the cylindrical pin 7 and the first fitting groove 4 are threadedly engaged through the internal and external threads, by rotating the cylindrical pin 7 relative to the first fitting groove 4 around its own central axis, the cylindrical pin 7 can move relative to the first fitting groove 4 along the length direction of the first fitting groove 4, thereby adjusting the position of the cylindrical pin 7 in the length direction of the first fitting groove 4, so as to facilitate reducing the gap a, and further facilitating the sealing ring 5 to extend toward the direction close to the first end 8;

[0052] Specifically, a second card slot 11 is provided at the end of the cylindrical pin 7. By using a tool, such as a suitable screwdriver, the end of the screwdriver is stuck in the second card slot 11. Thus, during the process of turning the screwdriver, the screwdriver drives the second card slot 11 to move, thereby driving the cylindrical pin 7 to rotate.

[0053] As a preferred embodiment, on the basis of the above-described manner, further, a sealing assembly 12 is further provided on the valve seat support 1, and the sealing assembly 12 is used to abut against the inner wall of the valve body, so that the sealing assembly 12 and the valve body cooperate to form a sealing pair.

[0054] Further, by providing the sealing assembly 12, the sealing performance between the valve seat and the valve body is improved.

[0055] As a preferred technical solution of the present application, the sealing assembly 12 includes a graphite rope 13 and / or an O-ring 14, and the O-ring 14 is made of an elastic rubber material.

[0056] Embodiment 2: On the basis of the technical solution of Embodiment 1, further, refer to Figures 5 - 7As shown, the valve seat support 1 includes a valve seat body 15 and a first base 16, the first base 16 is slidably arranged on the valve seat body 15, the cylindrical pin 7 is internally threadedly connected with a secondary pin 17, the secondary pin 17 is used to abut against the first base 16, and the side of the first base 16 away from the secondary pin 17 is used to abut against the coil spring;

[0057] By rotating the secondary pin 17 relative to the cylindrical pin 7, the secondary pin 17 pushes the first base 16 to move relative to the valve seat body 15 along the length direction of the first matching groove 4. The direction in which the first base 16 moves relative to the valve seat body 15 is the same as the length direction of the coil spring.

[0058] Furthermore, by providing a sub-pin 17, the sub-pin 17 is threadedly connected with the cylindrical pin 7, so that when the sub-pin 17 is rotated relative to the cylindrical pin 7 around its own central axis, the sub-pin 17 can move relative to the cylindrical pin 7 along the length direction of the cylindrical pin 7. Under the premise that the cylindrical pin 7 is fixed relative to the valve seat body 15, the sub-pin 17 is rotated relative to the cylindrical pin 7 to move along the length direction of the cylindrical pin 7, so that the first base 16 can be pushed to move relative to the valve seat body 15, so that the preload force of the coil spring can be further adjusted. Furthermore, when the preload force of the coil spring is reduced due to the wear of the sealing ring 5, this adjustment method can further increase the preload force of the coil spring, thereby further improving the sealing performance of the ball and the valve seat;

[0059] Specifically, a third clamping groove 18 is provided on the end of the auxiliary pin 17 away from the first base 16. By using a suitable special screwdriver, the end of the screwdriver is clamped in the third clamping groove 18. On the premise that the cylindrical pin 7 is fixed relative to the valve seat body 15, the screwdriver is twisted to make the screwdriver drive the third clamping groove 18 to move, thereby driving the auxiliary pin 17 to rotate relative to the cylindrical pin 7.

[0060] Furthermore, the selected special screwdriver includes a screwdriver part 201 and a screwdriver part 202, and the screwdriver part 201 and the screwdriver part 202 are rotatably connected. The screwdriver part 201 includes a handle part 203 and a mating part 204, and the screwdriver part 202 includes a handle part 205 and a mating part 206, wherein the handle part 203 and the handle part 205 are used for the operator to hold, the mating part 204 is used to be stuck in the second slot 11, and the mating part 206 is used to be stuck in the third slot 18. In this way, by using the special screwdriver, the cylindrical pin 7 or the sub-pin 17 can be twisted, thereby further improving the convenience of adjusting the position of the cylindrical pin 7 or the sub-pin 17 in the first mating slot 4.

[0061] Embodiment 3: This embodiment provides a forged steel fully welded fixed ball valve, see Figure 8 As shown, it includes the valve seat assembly as described above.

[0062] In the present application, by providing a seat assembly on the forged steel fully welded fixed ball valve, the service life of the sealing ring 5 can be improved, and the replacement frequency of the seat or the sealing ring 5 can be reduced.

[0063] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above respective embodiments, the present invention is not limited to the above specific embodiments. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and their improvements that do not depart from the spirit and scope of the present invention are covered by the scope of the claims of the present invention.

Claims

1. A valve seat assembly, characterized in that: It comprises a valve seat support, the valve seat support is provided with a first chamber, a first groove and a first matching groove, the first chamber accommodates a sealing ring, the sealing ring is made of rubber material, the first groove accommodates a valve seat pressure ring, the valve seat pressure ring abuts against the sealing ring, a gap a is formed between the side of the valve seat pressure ring facing the sealing ring and the first groove, the gap a≠0, a cylindrical pin is provided in the first matching groove, the cylindrical pin is used to limit the movement of the valve seat pressure ring in its radial direction and adjust the movement of the valve seat pressure ring along its width direction, and the end of the sealing ring for contacting with the ball is the first end; When the movement of the valve seat pressure ring along its width direction is adjusted to reduce the gap a, the sealing ring is squeezed by the inner wall of the first chamber and the valve seat pressure ring so that the sealing ring extends toward the first end.

2. The valve seat assembly according to claim 1, characterized in that: A first inclined surface is formed in the first chamber, and the first inclined surface is used to guide the sealing ring to extend toward the direction close to the first end when the gap a is reduced.

3. The valve seat assembly according to claim 2, wherein: The cross-section of the sealing ring is in the shape of a triangle, and the first end is located at the end of the triangular cross-section of the sealing ring.

4. A valve seat assembly according to claim 3, characterized in that: A limiting step is arranged on the cylindrical pin, and the limiting step is used to abut against a side of the valve seat pressure ring away from the sealing ring.

5. The valve seat assembly according to claim 4, characterized in that: The cylindrical pin is provided with an external thread, and the first matching groove is provided with an internal thread. The cylindrical pin and the first matching groove are threadedly matched through the internal and external threads so that the cylindrical pin can adjust its position along the length direction of the first matching groove.

6. The valve seat assembly according to claim 5, characterized in that: A sealing component is also provided on the valve seat support, and the sealing component is used to abut against the inner wall of the valve body so that the sealing component cooperates with the valve body to form a sealing pair.

7. A valve seat assembly according to claim 6, characterized in that: The sealing component includes a graphite rope and / or an O-ring.

8. The valve seat assembly according to claim 7, wherein: The valve seat support includes a valve seat body and a first base, the first base is slidably arranged on the valve seat body, the cylindrical pin is internally threadedly connected with a secondary pin, the secondary pin is used to abut against the first base, and a side of the first base away from the secondary pin is used to abut against the coil spring; By rotating the auxiliary pin relative to the cylindrical pin, the auxiliary pin pushes the first base to move relative to the valve seat body along the length direction of the first matching groove, and the direction in which the first base moves relative to the valve seat body is the same as the length direction of the coil spring.

9. A forged steel fully welded fixed ball valve, characterized in that: The valve seat assembly comprises the valve seat assembly according to any one of claims 1 to 8.

Images