Novel small-caliber fixed ball valve seat

Abstract

The utility model discloses a novel small-caliber fixed ball valve seat, relates to the technical field of ball valve seats, and aims to solve the problems that in order to achieve a good sealing effect of a small-caliber ball valve at present, the number of springs needs to be increased, thrust needs to be increased by enlarging the pressure difference area of the valve seat, sealing is formed, the valve torque is increased, and the service life is prolonged. The problems that in the valve opening and closing process, the specific pressure of a sealing ring is directly increased due to the fact that thrust of a spring and a medium on a valve seat is increased, the friction loss of the sealing ring is increased, the sealing performance of the sealing ring is affected, and finally sealing fails are solved. Valve seats are symmetrically arranged on the two sides of the ball body, triangular ring lock covers are arranged below the ends, close to the ball body, of the valve seats, elastic triangular rings are arranged between the valve seats and the sides, close to the ball body, of the triangular ring lock covers, compression spring grooves are formed in the four corners of the inner side of the valve body, and compression springs are arranged in the compression spring grooves.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valve seats, in particular to a novel small-caliber fixed ball valve seat. Background Art

[0002] A small-diameter fixed ball valve is a valve whose characteristic is that the ball is fixed by the upper and lower valve stems, and the valve is opened and closed as the valve stem rotates. This valve is usually used in occasions that require rapid opening and closing, such as cutoff and control in fluid pipelines. The center line of the ball of the small-diameter fixed ball valve is offset relative to the center line of the valve body, and the valve seat sealing surface is also eccentric. When the valve stem rotates 90° clockwise around a certain point, the ball also rotates 90° and fits tightly with the valve seat sealing surface to form a seal. This structure enables the valve to have a smaller opening torque and a tight closing effect. The end of the valve stem of the small-diameter fixed ball valve is usually processed into a flat shape with a short shaft, and there are flat grooves and holes on the upper and lower sides of the ball. These holes are used to connect with the upper and lower valve stems to fix the ball and limit the freedom of the ball. At the same time, they also help to balance the pressure between the body cavity and the pipeline medium.

[0003] At present, ball valves have been widely used in the oil, gas and other industries. At present, the sealing of small-diameter ball valves generally adopts the method of embedding a sealing ring inside the valve seat to contact the ball to form a sealing surface. The material of the sealing ring is generally made of polymer materials, such as PTFE, RPTFE, NYLON, etc. The disadvantage of this sealing ring is that the elastic sealing is not good enough and the material is hard. In order to achieve a good sealing effect, it is necessary to increase the number of springs and increase the thrust by increasing the pressure difference area of ​​the valve seat, so that the valve seat sealing ring fits tightly with the ball to form a seal, thereby increasing the valve torque. During the valve switching process, the valve torque is large. The increase in the thrust of the spring and the medium on the valve seat will directly increase the specific pressure of the sealing ring, resulting in an increase in the friction loss of the sealing ring, affecting the sealing performance of the sealing ring, and ultimately leading to sealing failure. Therefore, we propose a new type of small-diameter fixed ball valve seat to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a novel small-diameter fixed ball valve seat to solve the problem proposed in the above background technology that in order to achieve a good sealing effect for the small-diameter ball valve currently used, it is necessary to increase the number of springs and increase the thrust by increasing the pressure difference area of ​​the valve seat to form a seal, thereby increasing the valve torque. During the valve switching process, the increase in the thrust of the spring and the medium on the valve seat will directly increase the specific pressure of the sealing ring, resulting in an increase in the friction loss of the sealing ring, affecting the sealing performance of the sealing ring, and ultimately causing the sealing failure.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a novel small-caliber fixed ball valve seat, comprising a valve body, a ball is rotatably arranged at the middle position inside the valve body, valve seats are symmetrically arranged on both sides of the ball, a triangular ring locking cover is arranged below the valve seat near one end of the ball, and the triangular ring locking cover is fitted with the valve seat, an elastic triangular ring is arranged between the valve seat and the triangular ring locking cover near the side of the ball, and the elastic triangular ring is fitted with the ball and sealed, the elastic triangular ring is made of fluororubber, compression spring grooves are arranged at the four corners inside the valve body, and the compression spring groove is located on one side of the triangular ring locking cover, and a compression spring is arranged inside the compression spring groove.

[0006] Preferably, valve covers are symmetrically arranged on both sides of the valve body, a valve stem is arranged above the sphere, and the valve stem is fixedly connected to the sphere, a packing pressure plate is sealingly connected above the valve body, and the valve stem is rotatably connected to the packing pressure plate, and packing is filled between the packing pressure plate and the valve body.

[0007] Preferably, an opening retaining ring is provided between the valve seat and the side of the triangular ring locking cover away from the spherical body, and the lower end of the opening retaining ring extends to the interior of the triangular ring locking cover and is slidably connected to the triangular ring locking cover.

[0008] Preferably, a piston O-ring is sleeved on the outside of the valve seat away from the spherical body, and the piston O-ring fits the valve body and the valve seat respectively, and a graphite ring is arranged on one side of the piston O-ring, and the graphite ring fits the valve body and the valve seat respectively.

[0009] Preferably, one end of the compression spring fits against the inner wall of the compression spring groove, and the other end of the compression spring fits against the triangular ring lock cover.

[0010] Preferably, the outer ends of the valve seat and the triangular ring lock cover are plated with an anti-corrosion layer.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The material of the elastic triangular ring of the utility model is fluororubber. The elastic triangular ring has good elastic sealing and can compensate for the slight deformation between the ball and the valve seat. Therefore, the elastic triangular ring has excellent sealing performance. At the same time, the elastic triangular ring has anti-explosion properties, and the Shore hardness can generally reach 95-98, so the elastic triangular ring also has the function of resisting high pressure. After adopting the elastic triangular ring sealing structure, the number of springs used is greatly reduced, which not only saves costs but also greatly reduces the thrust of the initial sealing of the valve seat. When the valve is unloaded, the valve is easy to switch, which reduces the pressure difference area of ​​the valve seat, reduces the thrust of the medium, reduces the valve torque from the root, and improves the overall performance of the valve. By reducing the number of springs and reducing the pressure difference area of ​​the valve seat, the thrust of the valve seat is greatly reduced. Therefore, the actual specific pressure borne by the elastic triangular ring is much smaller than the specific pressure of the valve seat made of polymer materials, which can effectively reduce the wear of the elastic triangular ring and increase the life of the valve seat seal. It solves the problem that in order to achieve a good sealing effect for small-diameter ball valves, the number of springs needs to be increased and the thrust needs to be increased by increasing the pressure difference area of ​​the valve seat to form a seal, thereby increasing the valve torque. During the valve switching process, the increase in the thrust of the spring and the medium on the valve seat will directly increase the specific pressure of the sealing ring, resulting in an increase in the friction loss of the sealing ring, affecting the sealing performance of the sealing ring, and ultimately leading to the problem of sealing failure.

[0013] 2. The surface of the valve seat support ring and the triangular ring lock cover is treated with chemical nickel plating. The coating thickness reaches 50μm, the coating is uniform, and the coating hardness can reach HV650 to 750. The surface of the parts has anti-corrosion and erosion resistance after chemical nickel plating. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 For the utility model Figure 1 A partial enlarged view of area A.

[0016] In the figure: 1. valve body; 2. ball; 3. valve cover; 4. valve seat; 5. valve stem; 6. packing; 7. packing pressure plate; 8. triangular ring lock cover; 9. elastic triangular ring; 10. open retaining ring; 11. piston O-ring; 12. graphite ring; 13. compression spring groove; 14. compression spring; 15. anti-corrosion layer. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0018] See also Figure 1-2The utility model provides an embodiment: a novel small-caliber fixed ball valve seat, comprising a valve body 1, a ball 2 is rotatably arranged at the middle position inside the valve body 1, valve seats 4 are symmetrically arranged on both sides of the ball 2, a triangular ring lock cover 8 is arranged below the valve seat 4 near one end of the ball 2, and the triangular ring lock cover 8 fits with the valve seat 4, an elastic triangular ring 9 is arranged between the valve seat 4 and the triangular ring lock cover 8 near the side of the ball 2, and the elastic triangular ring 9 fits with the ball 2 and is sealed, the elastic triangular ring 9 is made of fluororubber, compression spring grooves 13 are arranged at the four corners on the inner side of the valve body 1, and the compression spring groove 13 is located on one side of the triangular ring lock cover 8, and a compression spring 14 is arranged inside the compression spring groove 13.

[0019] The material of the elastic triangular ring 9 is fluororubber. The elastic triangular ring 9 has good elastic sealing and can compensate for the slight deformation between the ball and the valve seat. Therefore, the elastic triangular ring 9 has excellent sealing performance. At the same time, the elastic triangular ring 9 has explosion-proof properties, and the Shore hardness can generally reach 95-98, so the elastic triangular ring also has high pressure resistance. After adopting the elastic triangular ring 9 sealing structure, the number of compression springs 14 used is greatly reduced, which not only saves costs but also greatly reduces the thrust of the initial seal of the valve seat 4. When the valve is unloaded, the valve switch is easy, the pressure difference area of ​​the valve seat 4 is reduced, the medium thrust is reduced, the valve torque is reduced from the root, and the overall performance of the valve is improved. By reducing the number of compression springs 14 and reducing the pressure difference area of ​​the valve seat 4, the thrust of the valve seat 4 is greatly reduced. Therefore, the actual specific pressure of the elastic triangular ring 9 is much smaller than the specific pressure of the valve seat of polymer materials, which can effectively reduce the wear of the elastic triangular ring 9 and increase the sealing life of the valve seat.

[0020] See also Figure 1 Valve covers 3 are symmetrically arranged on both sides of the valve body 1, a valve stem 5 is arranged above the ball 2, and the valve stem 5 is fixedly connected to the ball 2, a packing pressure plate 7 is sealed and connected above the valve body 1, and the valve stem 5 is rotatably connected to the packing pressure plate 7, and a packing 6 is filled between the packing pressure plate 7 and the valve body 1.

[0021] See also Figure 2 An open retaining ring 10 is arranged between the valve seat 4 and the side of the triangular ring lock cover 8 away from the spherical body 2, and the lower end of the open retaining ring 10 extends to the inside of the triangular ring lock cover 8 and is slidably connected with the triangular ring lock cover 8.

[0022] See also Figure 2 A piston O-ring 11 is mounted on the outside of the valve seat 4 away from the spherical body 2, and the piston O-ring 11 fits with the valve body 1 and the valve seat 4 respectively. A graphite ring 12 is arranged on one side of the piston O-ring 11, and the graphite ring 12 fits with the valve body 1 and the valve seat 4 respectively.

[0023] See also Figure 2One end of the compression spring 14 fits with the inner wall of the compression spring groove 13 , and the other end of the compression spring 14 fits with the triangular ring lock cover 8 .

[0024] See also Figure 2 The outer ends of the valve seat 4 and the triangular ring lock cover 8 are plated with an anti-corrosion layer 15.

[0025] Working principle: During installation, first put the elastic triangular ring 9 on the groove corresponding to the valve seat 4, then put the triangular ring lock cover 8 on the valve seat 4, press the elastic triangular ring 9, put the open retaining ring 10 into the valve seat 4, and then clamp the end face of the triangular ring lock cover 8 and the end face of the valve seat 4 to make the elastic triangular ring 9 slightly deformed, and then squeeze the open retaining ring 10 into the groove of the triangular ring lock cover 8, lock the triangular ring lock cover 8, the valve seat 4 and the elastic triangular ring 9 to form an integrated structure to form a valve seat assembly. The material of the elastic triangular ring 9 is fluororubber. The elastic triangular ring 9 has good elastic sealing and can compensate for the slight deformation between the ball and the valve seat. Therefore, the elastic triangular ring 9 has excellent sealing performance. At the same time, the elastic triangular ring 9 has anti-explosion properties, and the Shore hardness can generally reach 95-98, so the elastic triangular ring also has the function of resisting high pressure. After adopting the elastic triangular ring 9 sealing structure, the number of compression springs 14 used is greatly reduced, which not only saves costs but also greatly reduces the thrust of the initial sealing of the valve seat 4. When the valve is unloaded, the valve is easy to switch, which reduces the pressure difference area of ​​the valve seat 4, reduces the medium thrust, and fundamentally reduces the valve torque, thereby improving the overall performance of the valve. By reducing the number of compression springs 14 and reducing the pressure difference area of ​​the valve seat 4, the thrust of the valve seat 4 is greatly reduced. Therefore, the actual specific pressure borne by the elastic triangular ring 9 is much smaller than the specific pressure of the valve seat made of polymer materials, which can effectively reduce the wear of the elastic triangular ring 9 and increase the sealing life of the valve seat.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A novel small-caliber fixed ball valve seat, comprising a valve body (1), characterized in that: A sphere (2) is rotatably arranged at a middle position inside the valve body (1), and valve seats (4) are symmetrically arranged on both sides of the sphere (2). A triangular ring lock cover (8) is arranged below one end of the valve seat (4) close to the sphere (2), and the triangular ring lock cover (8) fits the valve seat (4). An elastic triangular ring (9) is arranged between the valve seat (4) and the triangular ring lock cover (8) close to the sphere (2), and the elastic triangular ring (9) fits and is sealed with the sphere (2). The elastic triangular ring (9) is made of fluororubber. Compression spring grooves (13) are arranged at four corners inside the valve body (1), and the compression spring groove (13) is located on one side of the triangular ring lock cover (8). A compression spring (14) is arranged inside the compression spring groove (13).

2. According to claim 1, a novel small-caliber fixed ball valve seat is characterized in that: Valve covers (3) are symmetrically arranged on both sides of the valve body (1); a valve stem (5) is arranged above the sphere (2), and the valve stem (5) is fixedly connected to the sphere (2); a packing pressure plate (7) is sealingly connected above the valve body (1), and the valve stem (5) is rotatably connected to the packing pressure plate (7); and a packing (6) is filled between the packing pressure plate (7) and the valve body (1).

3. According to claim 1, a novel small-caliber fixed ball valve seat is characterized in that: An opening retaining ring (10) is provided between the valve seat (4) and the side of the triangular ring locking cover (8) away from the spherical body (2), and the lower end of the opening retaining ring (10) extends to the interior of the triangular ring locking cover (8) and is slidably connected to the triangular ring locking cover (8).

4. According to claim 1, a novel small-caliber fixed ball valve seat is characterized in that: A piston O-ring (11) is sleeved on the outside of the valve seat (4) away from the spherical body (2), and the piston O-ring (11) fits the valve body (1) and the valve seat (4) respectively. A graphite ring (12) is provided on one side of the piston O-ring (11), and the graphite ring (12) fits the valve body (1) and the valve seat (4) respectively.

5. According to claim 1, the novel small-caliber fixed ball valve seat is characterized in that: One end of the compression spring (14) fits against the inner wall of the compression spring groove (13), and the other end of the compression spring (14) fits against the triangular ring lock cover (8).

6. According to claim 1, a novel small-caliber fixed ball valve seat is characterized in that: The outer ends of the valve seat (4) and the triangular ring lock cover (8) are both plated with an anti-corrosion layer (15).

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