High-pressure ball valve

Abstract

The utility model discloses a high-pressure ball valve, which is characterized in that a through flow channel is arranged in the middle of the interior of a ball body, the high-pressure ball valve comprises a pair of pressure relief grooves, the pressure relief grooves are arranged on the peripheral surface of the ball body and are respectively positioned on two sides of the flow channel, and the pressure relief grooves balance the pressure at two ends of the pressure relief grooves. Pressure on the two sides of the sealing face of the valve seat and the ball body is balanced through the pressure relief grooves, the high-pressure contact ratio of the valve seat and the ball body is eliminated, the friction distance between the ball body and the valve seat of the high-pressure ball valve is reduced, abrasion of the high-pressure ball valve is reduced, and the service life of the high-pressure ball valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, in particular to a high-pressure ball valve. Background Art

[0002] like Figure 1 The figure shows a cross-sectional view of a ball valve in the prior art. The sealing of the ball and the valve seat of the ball valve relies on the pressure difference on both sides of the contact surface between the ball and the valve seat. The higher the medium pressure, the greater the specific pressure of the sealing surface between the ball and the valve seat. In the process of opening the valve counterclockwise, before the ball and the valve seat separate, the sealing surface of the ball and the valve seat remains sealed, and the sealing surfaces of the two parts rub against each other under high contact pressure. The greater the separation angle between the ball and the valve seat, the longer the distance of the sealing friction.

[0003] As the pressure rating of the ball valve increases, the diameter of the ball becomes larger and larger, and the angle between the valve seat and the ball gradually increases. For example: for a 300LB fixed ball valve, the angle between the valve seat and the ball is about 3°; for a 600LB fixed ball valve, the angle between the valve seat and the ball is about 5°; for a 2500LB fixed ball valve, the angle between the valve seat and the ball exceeds 15°.

[0004] With the ball valve of the prior art, as the pressure increases, not only the sealing stress between the valve seat and the ball increases, but also the sealing friction distance between the valve seat and the ball increases, which accelerates the wear of the sealing surfaces of the ball and the seat, making the service life of the high-pressure ball valve much lower than that of the low-pressure ball valve, and becoming the main reason for the failure of the ball valve driven by the high-pressure actuator. Summary of the invention

[0005] According to an embodiment of the utility model, a sphere is provided, wherein a through flow channel is opened in the middle of the sphere, comprising:

[0006] A pair of pressure relief grooves are provided on the outer peripheral surface of the sphere, and the pair of pressure relief grooves are respectively located on both sides of the flow channel, and the pressure relief grooves balance the pressure at both ends of the pressure relief grooves.

[0007] Furthermore, the pair of pressure relief grooves are centrally symmetrical.

[0008] The utility model also provides a high-pressure ball valve, comprising a valve seat, a spherical mounting cavity being arranged in the valve seat, and the spherical body mentioned above, the spherical body being mounted in the spherical mounting cavity;

[0009] Two annular grooves are arranged on the matching surfaces of the spherical installation cavity and the sphere, and sealing rings are arranged in the annular grooves, and the sealing rings are in sealing cooperation with the sphere.

[0010] Furthermore, the angle between the side of the annular groove close to the pressure relief groove, the center of the sphere and then to the end of the pressure relief groove close to the annular groove is 3°.

[0011] Furthermore, the cross section of the annular groove is rectangular.

[0012] Furthermore, the length of the pressure relief groove is greater than the cross-sectional width of the annular groove.

[0013] According to the high-pressure ball valve of the embodiment of the utility model, the pressure on both sides of the valve seat and the ball sealing surface is balanced by the pressure relief groove, thereby eliminating the high-pressure contact ratio between the valve seat and the ball, reducing the friction distance between the ball and the valve seat of the high-pressure ball valve, reducing the wear of the high-pressure ball valve, and extending the life of the high-pressure ball valve.

[0014] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of an existing high-pressure ball valve;

[0016] Figure 2 It is a structural diagram of a sphere according to an embodiment of the utility model.

[0017] Figure 3 It is a cross-sectional view of a high-pressure ball valve according to an embodiment of the utility model. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to further illustrate the present invention.

[0019] First, combine Figures 1 to 3 Description: The high-pressure ball valve according to the embodiment of the utility model is used for pneumatic actuators, electric actuators, hydraulic actuators, gas-liquid actuators, electro-hydraulic actuators, etc., and its application scenarios are very wide.

[0020] like Figure 2~3 As shown, the sphere 2 of the embodiment of the utility model has a through flow channel 21 opened in the middle of the interior of the sphere, including: a pair of pressure relief grooves 4, a pair of pressure relief grooves 4 are opened on the outer peripheral surface of the sphere 2, and the pair of pressure relief grooves 4 are respectively located on both sides of the flow channel 21, the pressure relief grooves 4 balance the pressure at both ends of the pressure relief grooves 4, and the pair of pressure relief grooves 4 are centrally symmetrical. When the sphere 2 rotates, the medium pressure on both sides of the flow channel 21 of the sphere 2 will automatically release and balance. The sphere provided in this embodiment can be used for various ball valves.

[0021] like Figure 2~3As shown, the utility model also provides a high-pressure ball valve, which is a ball valve of ≥600LB, comprising a valve seat 1 and a ball 2, a spherical mounting cavity is provided in the valve seat 1, the ball 2 is installed in the spherical mounting cavity, a through flow channel 21 is provided in the middle of the interior of the ball 2, two annular grooves are provided on the matching surfaces of the spherical mounting cavity and the ball 2, a sealing ring 3 is provided in the annular groove, the sealing ring 3 between the ball 2 and the valve seat 1 can effectively prevent leakage of high-pressure fluid, and the sealing ring 3 is sealed with the ball 2; a pair of pressure relief grooves 4 are provided on the outer peripheral surface of the ball 2, the pair of pressure relief grooves 4 are respectively located on both sides of the flow channel 21, and the pair of pressure relief grooves 4 are centrally symmetrically arranged, so that when the ball 2 rotates, the medium pressure on both sides of the ball 2 will automatically relieve pressure and balance, the pressure relief grooves 4 eliminate the high-pressure contact ratio of the valve seat 1 and the ball 2, and balance the pressure on both sides of the sealing surface of the valve seat 1 and the ball 2.

[0022] Furthermore, in the present embodiment, the pressure relief groove 4 is arranged at a distance of 3° from the outer diameter of the annular groove, that is, the angle A from the side of the annular groove close to the pressure relief groove 4 to the center of the sphere 2 and then to the end of the pressure relief groove 4 close to the annular groove is 3°, and the sealing friction distance of the high-pressure ball valve is equivalent to that of a 300LB ball valve, which greatly reduces the friction distance of the ball seat of the high-pressure ball valve, thereby reducing the wear of the high-pressure ball valve and extending the life of the high-pressure ball valve.

[0023] Further, if Figure 3 As shown, in this embodiment, the cross-section of the annular groove is rectangular, and the length of the pressure relief groove 4 is greater than the cross-sectional width of the annular groove. When the ball 2 rotates and the valve seat 1 passes through the pressure relief groove 4, the two sides of the sealing ring 3 are connected, the sealing ring 3 no longer forms a seal, and the high contact specific pressure between the valve seat 1 and the ball 2 is eliminated.

[0024] When the ball valve is opened, the valve stem drives the ball 2 to rotate counterclockwise, and the valve seat 1 passes through the pressure relief groove 4: the pressure on both sides of the sealing surface of the valve seat 1 and the ball 2 is balanced through the pressure relief groove 4, and no seal is formed. The high contact specific pressure between the valve seat 1 and the ball 2 is eliminated. At the same time, for the pressure relief groove 4 at the 3° position, the sealing friction distance of the high-pressure ball valve is equivalent to that of the 300LB ball valve, which greatly reduces the ball seat friction distance of the high-pressure ball valve, thereby reducing the wear of the high-pressure ball valve and extending the life of the high-pressure ball valve.

[0025] Above, refer to Figures 1 to 3 The utility model describes a high-pressure ball valve according to an embodiment of the utility model, which balances the pressure on both sides of the valve seat and the ball sealing surface through the pressure relief groove, eliminates the high-pressure contact ratio between the valve seat and the ball, reduces the friction distance between the ball and the valve seat of the high-pressure ball valve, reduces the wear of the high-pressure ball valve, and extends the life of the high-pressure ball valve.

[0026] It should be noted that, in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] Although the content of the utility model has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the utility model. After reading the above content, various modifications and substitutions of the utility model will be obvious to those skilled in the art. Therefore, the protection scope of the utility model should be limited by the attached claims.

Claims

1. A high-pressure ball valve, comprising a valve seat, wherein a spherical mounting cavity is provided in the valve seat, characterized in that: It also includes a sphere and a pair of pressure relief grooves; A through flow channel is provided in the middle of the interior of the sphere, and the sphere is installed in the spherical installation cavity; Two annular grooves are arranged on the mating surfaces of the spherical installation cavity and the sphere, and sealing rings are arranged in the annular grooves, and the sealing rings are in sealing cooperation with the sphere; The pair of pressure relief grooves are provided on the outer peripheral surface of the sphere, and the pair of pressure relief grooves are respectively located on both sides of the flow channel, and the pressure relief grooves balance the pressure at both ends of the pressure relief grooves; The angle between the side of the annular groove close to the pressure relief groove, the center of the sphere and then to the end of the pressure relief groove close to the annular groove is 3°.

2. The high pressure ball valve according to claim 1, characterized in that: The cross section of the annular groove is rectangular.

3. The high pressure ball valve according to claim 2, characterized in that: The length of the pressure relief groove is greater than the cross-sectional width of the annular groove.

4. The high pressure ball valve according to claim 1, characterized in that: The pair of pressure relief grooves are centrally symmetrical.

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