Ball valve capable of reducing pre-tightening friction

Abstract

The utility model provides a ball valve capable of reducing pre-tightening friction, which comprises a valve body, a valve ball, a sealing gasket and an elastic O-shaped ring, a groove is arranged on the non-sealing side of the sealing gasket, and the elastic O-shaped ring is arranged in the groove. Through the design of adding the elastic O-shaped ring and the sealing gasket, the pre-tightening friction force of the ball valve is reduced, the opening of the ball valve is smoother, and the sealing performance is improved. The problem that an existing ball valve is stuck due to acid and alkali media can be solved, the service life of the ball valve can be effectively prolonged, and the performance of the ball valve in the severe environment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to ball valve technical field especially is related to a ball valve of reducing pre -tight friction. BACKGROUND

[0002] Ball valves are widely used in pipelines as switching off or regulating medium devices. The conventional ball valve has simple structure, good sealing performance, small volume, light weight, small driving torque and other advantages. However, the anticorrosion ball valve in the prior art has the following problems: in the case of not being used for a long time, the working medium (such as acid and alkali) forms dirt on the spherical sealing surface, causing the ball valve to be stuck; in addition, the polytetrafluoroethylene coating deforms slightly due to the change of cold and hot temperature difference, and in the case of excessive pre-tightening force, the ball valve is difficult to open, and even cannot be opened, and the coating is worn, causing internal leakage. SUMMARY

[0003] The utility model discloses a ball valve of reducing pre -tight friction reduces the pre -tight friction of ball valve, makes the opening of ball valve more smooth, and improves the sealing performance.

[0004] According to the utility model discloses a ball valve of reducing pre -tight friction, including valve body, valve ball, packing and elastic O type ring, the non -sealed side of packing is equipped with groove, the elastic O type ring sets up in the groove.

[0005] Further, the elastic O-ring is made of silicone, fluororubber or nitrile rubber.

[0006] Further, the groove depth is 0.5mm to 2mm.

[0007] Further, the valve ball drive end is equipped with handle, and the handle adopts gap fit connection with the valve body.

[0008] Further, the opening state thickness of the packing is less than the closed state thickness.

[0009] Further, the valve body inner wall is equipped with polytetrafluoroethylene corrosion -resistant coating.

[0010] Further, the valve ball surface is equipped with wear -resistant coating.

[0011] Further, the packing is made of polytetrafluoroethylene, PTFE or PFA.

[0012] Further, the outer diameter of the elastic O-ring is greater than the groove width.

[0013] Further, the compression amount of the elastic O-ring is 0.1mm to 1mm.

[0014] The technical scheme of the utility model discloses through the design of increasing elastic O type ring and sealing washer, reduce the pre -tightening friction of ball valve, make the opening of ball valve more smooth, and improved sealing performance. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the specific embodiment of the utility model or prior art, the following will be briefly introduced the drawing needed to be used in the specific embodiment or prior art description, obviously, the drawing in the following description is some implementation of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0016] Fig. 1 It is the structural schematic diagram of the embodiment of the utility model;

[0017] Fig. 2 It is the sectional view of the embodiment of the utility model when A-A opening state;

[0018] Fig. 3 It is the sectional view of the embodiment of the utility model when A-A closing state;

[0019] In the drawing: 1, valve body;2, valve ball;3, tetrafluoroethylene sealing washer;4, elastic O type ring;5, groove;6, handle. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model will be clearly and completely described below in combination with embodiments, obviously, the described embodiment is a part of the embodiment of the utility model, instead of all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by ordinary skilled person in the art without making creative labor belong to the protection scope of the utility model.

[0021] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0022] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connecting", "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] Embodiment 1

[0024] As shown in Figs. 1-3

[0025] A ball valve for reducing pre-tightening friction, comprising a valve body 1, a valve ball 2, a tetrafluoroethylene gasket 3 and an elastic O-ring 4, the non-sealing side of the tetrafluoroethylene gasket 3 is provided with a groove 5, the depth of the non-sealing side groove 5 of the tetrafluoroethylene gasket 3 is between 0.5mm and 2mm.

[0026] The elastic O-ring 4 is arranged in the groove 5, the elastic O-ring 4 has elastic properties, and the compression amount of the elastic O-ring 4 is 0.1mm to 1mm, so as to ensure that the pre-tightening force is effectively reduced and the opening performance of the ball valve is improved. The outer diameter of the elastic O-ring 4 is greater than the width of the gasket groove 5, so as to ensure that the elastic O-ring 4 does not fall off after installation.

[0027] The elastic O-ring 4 can exert a certain compression force on the tetrafluoroethylene gasket 3 during the rotation of the valve ball 2 of the ball valve, thereby reducing the pre-tightening force when the ball valve is opened. The material of the elastic O-ring 4 is silicone, fluororubber, nitrile rubber or other suitable elastic materials.

[0028] The inside of the valve body 1 of the ball valve is coated with a corrosion-resistant material, and the corrosion-resistant material is polytetrafluoroethylene, so as to avoid corrosion of the valve body 1 by chemical media. The surface of the valve ball 2 is coated with a wear-resistant coating, which can be polytetrafluoroethylene or other corrosion-resistant materials.

[0029] The pre-tightening force between the valve body 1 and the tetrafluoroethylene gasket 3 is adjusted by the elastic deformation of the elastic O-ring 4. The thickness of the tetrafluoroethylene gasket 3 in the open state is less than that in the closed state. The non-sealing side of the tetrafluoroethylene gasket 3 matches the shape of the groove 5, so as to ensure that the elastic O-ring 4 can be properly compressed. The contact surface between the tetrafluoroethylene gasket 3 and the valve ball 2 is curved, so as to reduce the friction between the tetrafluoroethylene gasket 3 and the valve ball 2. ​

[0030] The driving member of the valve ball 2 is a handle 6, which is connected to the valve body 1 in a clearance fit manner, allowing the valve ball 2 to slightly displace during opening and closing. An adjustable gap is provided between the handle 6 of the ball valve and the valve body 1 to control the displacement amount of the valve ball 2 during opening and closing. When the ball valve is closed, the high-pressure side of the water inlet will push the valve ball 2 slightly in the outlet direction through the pressure difference, thereby enhancing the compression force of the elastic O-ring 4 and ensuring good sealing effect.

[0031] The elastic properties of the elastic O-ring 4 allow the tetrafluoroethylene gasket 3 to move freely during the rotation of the valve ball 2, thereby reducing the friction between the ball and the gasket.

[0032] In this embodiment, the gasket material can also use other materials with good sealing properties, such as PTFE, PFA, etc., in addition to polytetrafluoroethylene.

[0033] In this embodiment, the material of the elastic O-ring 4 is rubber, and different materials such as silicone or other rubber materials can also be used to adapt to different working environments and media. It can still maintain good sealing performance in high or low temperature environments and ensure smooth opening and closing of the ball valve.

[0034] The specific operation steps of the utility model are as follows:

[0035] When the ball valve is opened, the elastic O-ring 4 reduces the pre-tightening force through elastic deformation, allowing the ball valve to be easily opened. When the ball valve is closed, the ball slightly displaces with the formation of pressure difference, causing the elastic O-ring 4 to be further compressed and enhancing the sealing performance, preventing internal leakage.

[0036] The utility model processes groove 5 on the non-sealing side of the tetrafluoroethylene gasket 3 of the ball valve and adds elastic O-ring 4 in the groove 5 behind the tetrafluoroethylene gasket 3. Through the elastic properties of the elastic O-ring 4, the pre-tightening force between the ball valve and the tetrafluoroethylene gasket 3 is changed, achieving easy opening and closing while maintaining good sealing effect.

[0037] The ball valve structure of the utility model can be applied to various types of ball valves to improve the performance and reliability of the ball valve. The ball valve is suitable for acid and alkali media in chemical production and can effectively prevent the problem of jamming caused by long-term non-use. It can effectively reduce the opening force of the ball valve and improve the sealing performance, solving the problems of jamming, poor sealing and excessive pre-tightening force of traditional corrosion-resistant ball valves, and has significant technical effects and wide application prospects.

[0038] The utility model discloses a ball valve with elastic O-ring and improved sealing gasket, which reduces the pre-tightening friction of the ball valve, makes the opening of the ball valve more smooth, and improves the sealing performance.

[0039] The utility model discloses a ball valve with elastic O-ring and improved sealing gasket, which reduces the pre-tightening friction of the ball valve, makes the opening of the ball valve more smooth, and improves the sealing performance.

[0040] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A ball valve with reduced pre-tightening friction, characterized in that, The valve body, valve ball, sealing gasket and elastic O-shaped ring are included, the non-sealing side of the sealing gasket is provided with a groove, and the elastic O-shaped ring is arranged in the groove.

2. The reduced pre-tight friction ball valve of claim 1, wherein, The elastic O-shaped ring is made of silica gel, fluorine rubber or butyronitrile rubber.

3. The reduced pre-tight friction ball valve of claim 1, wherein, The groove depth is 0.5-2 mm.

4. The reduced pre-tight friction ball valve of claim 1, wherein, The valve ball driving end is provided with a handle, and the handle is connected with the valve body in a gap fit.

5. The reduced pre-tight friction ball valve of claim 1, wherein, The opening state thickness of the sealing gasket is less than the closing state thickness.

6. The reduced pre-tight friction ball valve of claim 1, wherein, The inner wall of the valve body is provided with a polytetrafluoroethylene corrosion-resistant coating.

7. The reduced pre-tight friction ball valve of claim 1, wherein, The surface of the valve ball is provided with a wear-resistant coating.

8. The reduced pre-tight friction ball valve of claim 1, wherein, The sealing gasket is made of polytetrafluoroethylene, PTFE or PFA.

9. The reduced pre-tight friction ball valve of claim 1, wherein, The outer diameter of the elastic O-shaped ring is greater than the groove width.

10. The reduced pre-tight friction ball valve of claim 1, wherein, The compression amount of the elastic O-shaped ring is 0.1-1 mm.

Images