C-shaped ball valve with bidirectional sealing function

Abstract

The invention belongs to the technical field of ball valves, and particularly relates to a C-shaped ball valve with a bidirectional sealing function, which comprises a valve body, a valve seat assembly and a valve ball, a first metal ring, flexible graphite and a second metal ring are arranged between the valve seat assembly and the valve body, and are matched by adopting V-shaped surfaces, so that the sealing property of the flexible graphite is improved; a first piston sealing piece and a second piston sealing piece which are distributed up and down are arranged on a valve seat assembly, a left cavity A1 is communicated with a left side cavity of a valve ball, a left cavity B1 is communicated with a right side cavity of the valve ball, the left cavity A1 is communicated with a right cavity B2, and the left cavity B1 is communicated with a right cavity A2. One of the first piston sealing piece and the second piston sealing piece can achieve sealing, the other piston sealing piece is far away from the valve ball, when the valve ball rotates, only one piston sealing piece is abraded, the other piston sealing piece is not abraded, and the service life of the piston sealing pieces is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, and particularly relates to a C-type ball valve with a two-way sealing function. Background Art

[0002] In the field of ball valves, double-seat ball valves have the problem of medium cavity material accumulation and short service life. In the prior art, C-type ball valves are used to solve this problem. Referring to Figure 1 , the shape of the valve ball 3 is C-shaped, and the valve seat 2 is located between the valve body 1 and the valve ball 3. However, it uses a single-seat seal, with poor sealing performance, can only seal unidirectionally, and cannot achieve two-way sealing, thus unable to meet the working conditions requirements of two-way material transportation.

[0003] There are also C-type ball valves in the prior art that can achieve two-way sealing. They use a shuttle valve structure to sense the pressure difference on both sides of the valve ball, and then adjust the two-way sealing pressure. However, the shuttle valve structure can often only achieve the liquid inlet of the valve seat pressure chamber. While increasing the valve seat sealing force, it cannot achieve the pressure relief of the valve seat pressure chamber, resulting in the valve ball and the valve seat always being in high-pressure contact. This is not only unfavorable for the rotation of the valve ball but also greatly increases the wear of the valve seat seal, reducing the service life of the ball valve. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems of poor sealing performance of C-type ball valves and easy wear of two-way sealing valve seat seals in the prior art.

[0005] To achieve the above purpose, the invention provides a C-type ball valve with a two-way sealing function, including a valve body, a valve seat assembly, and a valve ball. The valve seat assembly is arranged between the valve body and the valve ball. The valve ball is C-shaped. The valve seat assembly includes a valve seat body, and the valve seat body has a horizontal part and a vertical part. A stepped groove is provided near the vertical part of the valve body. A first elastic member, a first metal ring, flexible graphite, and a second metal ring are sequentially arranged in the stepped groove. One end of the first elastic member abuts against the valve body, and the other end abuts against the left end face of the first metal ring. The right end face of the first metal ring and the left end face of the second metal ring are both V-shaped convex surfaces, and both end faces of the flexible graphite are V-shaped concave surfaces. The V-shaped convex surfaces cooperate with the V-shaped concave surfaces, and the right end of the second metal ring abuts against the valve seat assembly.

[0006] Preferably, the first elastic member is a disc spring.

[0007] Preferably, the valve seat body is axially limited by a pressing plate, and the pressing plate is fixed to the valve body by screws.

[0008] Preferably, dust-proof rings are provided between the valve seat body and the valve body, between the valve seat body and the pressing plate, and between the pressing plate and the valve body.

[0009] Preferably, a groove is provided on the side wall of the valve body, and a second elastic member is provided in the groove. One end of the second elastic member abuts against the vertical portion of the valve seat body, and the second elastic member is a helical spring.

[0010] Preferably, the angle of the V-shaped convex surface is greater than the angle of the V-shaped concave surface.

[0011] Preferably, the second metal ring includes a metal ring body portion and a plurality of metal ring support portions spaced on the end face of the metal ring body portion. The metal ring body portion abuts against the flexible graphite, and the radial width of the metal ring support portion is smaller than that of the metal ring body portion.

[0012] Preferably, a first piston chamber and a second piston chamber are provided in the vertical portion of the valve seat body. A first piston seal is slidably provided in the first piston chamber, and a second piston seal is slidably provided in the second piston chamber. The first piston seal and the second piston seal are T-shaped and have the same structure. The first piston seal and the second piston seal have a piston portion and a sealing portion. The piston portion of the first piston seal divides the first piston chamber into a left chamber A and a right chamber A. The piston portion of the second piston seal divides the second piston chamber into a left chamber B and a right chamber B. The sealing portion penetrates the valve seat and cooperates with the valve ball. At both ends of the first piston chamber, a first step ring and a second step ring are respectively provided. At both ends of the second piston chamber, a third step ring and a fourth step ring are respectively provided. The side wall of the first step ring is provided with a first opening and a second opening. The side wall of the second step ring is provided with a third opening. The side wall of the fourth step ring is provided with a fourth opening. A fifth opening is provided on the side wall of the vertical portion of the valve seat body. Among them, the first opening and the second opening communicate with the left chamber A, the third opening communicates with the right chamber A, the fourth opening communicates with the right chamber B, and the fifth opening communicates with the left chamber B. The second opening communicates with the left cavity of the valve ball, the fifth opening communicates with the right cavity of the valve ball, the first opening communicates with the fourth opening through a flow channel, and the third opening communicates with the fifth opening and the left chamber B through a flow channel.

[0013] Preferably, the first piston seal and the second piston seal have a rigid skeleton and a rubber layer sleeved outside the rigid skeleton.

[0014] Preferably, a first filter element is provided at the second opening, and a second filter element is provided at the fifth opening.

[0015] The beneficial effects of a hydraulic assist proportional valve proposed by the present invention are as follows:

[0016] 1. By providing a first metal ring, flexible graphite, and a second metal ring between the valve seat body and the valve body, and using V-shaped surfaces for cooperation between them, the sealing performance of the flexible graphite is improved. The angle of the V-shaped convex surface is greater than the angle of the V-shaped concave surface, so that there is a gap between the V-shaped convex surface and the V-shaped concave surface, which can improve the deformation degree of the flexible graphite and further improve the sealing performance of the flexible graphite.

[0017] 2. The metal ring support part adopts an opening design, so that the second metal ring and the valve seat body are not in full contact. When reverse pressure appears at the second metal ring, the metal ring and the valve seat can be quickly disengaged, improving the sealing performance of the flexible graphite.

[0018] 3. In the present invention, by arranging the first piston seal and the second piston seal distributed up and down on the valve seat body, the left chamber A1 is communicated with the left chamber of the valve ball, the left chamber B1 is communicated with the right chamber of the valve ball, the left chamber A1 and the right chamber B2 are communicated, and the left chamber B1 and the right chamber A2 are communicated. No matter how the bilateral pressure of the valve ball changes, one of the first piston seal and the second piston seal can always achieve sealing, while the other is away from the valve ball. When the valve ball rotates, only one of the piston seals will be worn, and the other will not be worn, improving the service life of the piston seal.

[0019] 4. Filter elements are arranged at the inlet and outlet, which can filter impurities in the incoming fluid and prevent the impurities from blocking the flow channels inside the valve seat body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0021] Figure 1 [[ID=1⑥]]is a schematic structural diagram of a prior art C-type ball valve; <(

[0022] Figure 2 is a partial enlarged view of the C-type ball valve of the present invention;

[0023] Figure 3 is a schematic structural diagram of the valve seat body of the present invention;

[0024] Figure 4 is a schematic structural diagram of the valve group assembly of the present invention;

[0025] Figure 5 is a schematic structural diagram of the piston seal of the present invention;

[0026] Figure 6 is a schematic structural diagram of the second metal ring of the present invention.

[0027] In the figure: valve body 1, valve seat assembly 2, first piston seal 21, second piston seal 22, rigid skeletons 211, 221, rubber layers 212, 222, piston parts 213, 223, seal parts 214, 224, first step ring 23, first opening 231, second opening 232, second step ring 24, third opening 241, third step ring 25, fourth step ring 26, fourth opening 261, fifth opening 27, first filter element 28, second filter element 29, valve ball 3, pressure plate 4, first elastic element 5, first metal ring 6, flexible graphite 7, second metal ring 8, metal ring body part 81, metal ring support part 82, second elastic element 9, screw 10, dust-proof rings 11, 12, 13; left cavity A1, right cavity A2, left cavity B1, right cavity B2.

[0028] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this document. Detailed implementation manners

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this document clearer, the technical solutions in the embodiments of this document will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this document. Obviously, the described embodiments are some but not all of the embodiments of this document. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this document without creative efforts shall fall within the scope of protection of this document. It should be noted that, without conflict, the embodiments in this document and the features in the embodiments can be combined with each other arbitrarily.

[0030] Unless the context clearly requires otherwise, words such as "including" and "comprising" throughout the specification and claims should be construed in an inclusive sense rather than an exclusive or exhaustive sense; that is, the meaning of "including but not limited to".

[0031] Referring to Figure 2-6 , the present invention provides a C-type ball valve with a two-way sealing function, including a valve body 1, a valve seat assembly 2, and a valve ball 3. The valve seat assembly 2 is arranged between the valve body 1 and the valve ball 3. The valve ball 3 is C-shaped. The valve seat assembly 2 includes a valve seat body. The valve seat body is axially limited by a pressure plate 4. The pressure plate 4 is fixed to the valve body 1 by screws 10. Dust-proof rings 11, 12, 13 are provided between the valve seat body and the valve body 1, between the valve seat body and the pressure plate 4, and between the pressure plate 4 and the valve body 1. By providing the dust-proof rings, the sealing performance of relevant surfaces can be improved.

[0032] The valve seat body has a horizontal part and a vertical part. A stepped groove is provided near the vertical part of the valve body 1. A first elastic member 5, a first metal ring 6, flexible graphite 7, and a second metal ring 8 are sequentially arranged in the stepped groove. One end of the first elastic member 5 abuts against the valve body 1, and the other end abuts against the left end face of the first metal ring 6. The first elastic member 5 is a disc spring. The right end face of the first metal ring 6 and the left end face of the second metal ring 8 are both V-shaped convex surfaces, and both end faces of the flexible graphite 7 are V-shaped concave surfaces. The V-shaped convex surfaces are matched with the V-shaped concave surfaces. The right end of the second metal ring 8 abuts against the valve seat assembly 2; the angle of the V-shaped convex surface is greater than the angle of the V-shaped concave surface; a groove is provided on the side wall of the valve body 1, and a second elastic member 9 is arranged in the groove. One end of the second elastic member 9 abuts against the vertical part of the valve seat body. The second elastic member 9 is a helical spring; the first elastic member 5 and the second elastic member 9 can apply a force towards the valve ball 3 to the valve seat assembly to ensure the static sealing performance between the valve ball and the valve seat assembly.

[0033] In the present invention, by arranging the first metal ring 6, flexible graphite 7, and the second metal ring 8 between the valve seat body and the valve body, and using V-shaped surfaces for cooperation among them, no matter which direction the pressure increases, the flexible graphite 7 can be extruded to improve its sealing performance; in particular, the angle of the V-shaped convex surface is greater than the angle of the V-shaped concave surface, so that there is a gap between the V-shaped convex surface and the V-shaped concave surface, which can improve the deformation degree of the flexible graphite 7, thereby further improving the sealing performance of the flexible graphite 7.

[0034] The second metal ring 8 includes a metal ring body part 81 and a plurality of metal ring support parts 82 spaced on the end face of the metal ring body part 81. The metal ring body part 81 abuts against the flexible graphite 7, and the radial width of the metal ring support parts 82 is smaller than that of the metal ring body part 81; one end of the second metal ring 8 is a plurality of metal ring support parts 82 arranged at intervals, and the metal ring support parts 82 adopt an open design, so that the second metal ring 8 is not in full contact with the valve seat body. When a reverse pressure appears at the second metal ring 8, the metal ring and the valve seat can be quickly disengaged to improve the sealing performance of the flexible graphite 7.

[0035] Inside the vertical part of the valve seat body, there are a first piston chamber and a second piston chamber. A first piston seal 21 is slidably arranged in the first piston chamber, and a second piston seal 22 is slidably arranged in the second piston chamber. The first piston seal 21 and the second piston seal 22 are T-shaped and have the same structure. The first piston seal 21 and the second piston seal 22 have piston parts 213, 223 and seal parts 214, 224. The piston part 213 divides the first piston chamber into a left chamber A1 and a right chamber A2, and the piston part 223 divides the second piston chamber into a left chamber B1 and a right chamber B2. The seal parts 214, 224 penetrate through the valve seat and cooperate with the valve ball 3. At both ends of the first piston chamber, there are a first stepped ring 23 and a second stepped ring 24 respectively. At both ends of the second piston chamber, there are a third stepped ring 25 and a fourth stepped ring 26 respectively. The side wall of the first stepped ring 23 is provided with a first opening 231 and a second opening 232. The side wall of the second stepped ring 24 is provided with a third opening 241. The side wall of the fourth stepped ring 26 is provided with a fourth opening 261. The side wall of the vertical part of the valve seat body is provided with a fifth opening 27. Among them, the first opening 231 and the second opening 232 are communicated with the left chamber A1, the third opening 241 is communicated with the right chamber A2, the fourth opening 261 is communicated with the right chamber B2, and the fifth opening 27 is communicated with the left chamber B1. The second opening 232 is communicated with the left cavity of the valve ball 3, and the fifth opening 27 is communicated with the right cavity of the valve ball 3. The first opening 231 is communicated with the fourth opening 261 through a flow channel, and the third opening 241 is communicated with the fifth opening 27 and the left chamber B1 through a flow channel.

[0036] In the present invention, by arranging the first piston seal 21 and the second piston seal 22 which are distributed up and down in the valve seat body, the left chamber A1 is communicated with the left cavity of the valve ball 3, the left chamber B1 is communicated with the right cavity of the valve ball 3, the left chamber A1 is communicated with the right chamber B2, and the left chamber B1 is communicated with the right chamber A2. When the pressure in the left cavity of the valve ball 3 increases, the pressures in the left chamber A1 and the right chamber B2 increase. The first piston seal 21 moves towards the valve ball 3 and presses tightly, and the two achieve sealing. While the second piston seal 22 moves away from the valve ball 3, and a gap is generated between the two. On the contrary, when the pressure in the right cavity of the valve ball 3 increases, the pressures in the left chamber B1 and the right chamber A2 increase. The second piston seal 22 moves towards the valve ball 3 and presses tightly, and the two achieve sealing. While the first piston seal 21 moves away from the valve ball 3, and a gap is generated between the two. It can be seen from this that no matter how the pressures on both sides of the valve ball 3 change, one of the first piston seal 21 and the second piston seal 22 can always achieve sealing, while the other moves away from the valve ball 3. When the valve ball 3 rotates, only one of the piston seals will be worn, while the other will not be worn, improving the service life of the piston seal. When the pressures on both sides of the valve ball 3 are equal, both the first piston seal 21 and the second piston seal 22 are in contact with the valve ball 3, but the sealing force is not large. While achieving sealing, it will not cause serious wear due to excessive sealing force.

[0037] The first piston seal 21 and the second piston seal 22 each have a rigid framework 211, 221 and a rubber layer 212, 222 sleeved outside the rigid frameworks 211, 221. This can not only improve the strength of the piston seal but also ensure its sealing performance.

[0038] A first filter element 28 is provided at the second opening 232, and a second filter element 29 is provided at the fifth opening 27. The second opening 232 and the fifth opening 27 are the inlets and outlets of the fluid. By providing filter elements at the inlets and outlets, impurities in the incoming fluid can be filtered to prevent the impurities from clogging the flow channels inside the valve seat body.

[0039] The valve seat body has a chamber and flow channels. The valve seat body can be first manufactured in parts and then assembled and fixed to reduce the processing difficulty. The specific processing technology is an existing mature technology and will not be elaborated here.

[0040] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0041] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the intention of the present invention also includes these modifications and variations.

Claims

1. A C-type ball valve with a two-way sealing function, comprising a valve body, a valve seat assembly, and a valve ball. The valve seat assembly is arranged between the valve body and the valve ball. The valve ball is C-shaped. The valve seat assembly includes a valve seat body, and is characterized in that, The valve seat body has a horizontal portion and a vertical portion. A stepped groove is provided near the vertical portion of the valve body. A first elastic member, a first metal ring, flexible graphite, and a second metal ring are sequentially arranged in the stepped groove. One end of the first elastic member abuts against the valve body, and the other end abuts against the left end face of the first metal ring. The right end face of the first metal ring and the left end face of the second metal ring are both V-shaped convex surfaces, and both end faces of the flexible graphite are V-shaped concave surfaces. The V-shaped convex surfaces cooperate with the V-shaped concave surfaces, and the right end of the second metal ring abuts against the valve seat assembly.

2. The C-type ball valve according to claim 1, characterized in that, The first elastic member is a disc spring.

3. The C-type ball valve according to claim 1, characterized in that, Axial limitation of the valve seat body is carried out through a pressing plate, and the pressing plate is fixed to the valve body by screws.

4. The C-type ball valve according to claim 3, characterized in that, Dust-proof rings are provided between the valve seat body and the valve body, between the valve seat body and the pressing plate, and between the pressing plate and the valve body.

5. The C-type ball valve according to claim 1, wherein A groove is provided on the side wall of the valve body, and a second elastic member is arranged in the groove. One end of the second elastic member abuts against the vertical portion of the valve seat body, and the second elastic member is a helical spring.

6. The C-type ball valve according to claim 1, characterized in that The angle of the V-shaped convex surface is greater than the angle of the V-shaped concave surface.

7. The C-type ball valve according to claim 1, wherein, The second metal ring includes a metal ring body portion and a plurality of metal ring support portions spacedly arranged on the end face of the metal ring body portion. The metal ring body portion abuts against the flexible graphite, and the radial width of the metal ring support portion is smaller than that of the metal ring body portion.

8. The C-type ball valve according to claim 1, characterized in that, A first piston chamber and a second piston chamber are provided in the vertical portion of the valve seat body. A first piston seal is slidably arranged in the first piston chamber, and a second piston seal is slidably arranged in the second piston chamber. The first piston seal and the second piston seal are T-shaped and have the same structure. The first piston seal and the second piston seal have a piston portion and a sealing portion. The piston portion of the first piston seal divides the first piston chamber into a left chamber A and a right chamber A, and the piston portion of the second piston seal divides the second piston chamber into a left chamber B and a right chamber B. The sealing portion penetrates through the valve seat and cooperates with the valve ball; A first stepped ring and a second stepped ring are respectively provided at both ends of the first piston chamber, a third stepped ring and a fourth stepped ring are respectively provided at both ends of the second piston chamber. A first opening and a second opening are provided on the side wall of the first stepped ring, a third opening is provided on the side wall of the second stepped ring, a fourth opening is provided on the side wall of the fourth stepped ring, and a fifth opening is provided on the side wall of the vertical portion of the valve seat body. Among them, the first opening and the second opening communicate with the left chamber A, the third opening communicates with the right chamber A, the fourth opening communicates with the right chamber B, and the fifth opening communicates with the left chamber B; The second opening communicates with the cavity on the left side of the valve ball, the fifth opening communicates with the cavity on the right side of the valve ball, the first opening communicates with the fourth opening through a flow channel, and the third opening communicates with the fifth opening and the left chamber B through a flow channel.

9. The C-type ball valve according to claim 8, wherein, The first piston seal and the second piston seal have a rigid skeleton and a rubber layer sleeved outside the rigid skeleton.

10. The C-type ball valve according to claim 8 or 9, characterized in that, A first filter element is provided at the second opening, and a second filter element is provided at the fifth opening.

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