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Ball valve metal valve seat with elastic compensation function and pressure auxiliary sealing function

An elastic compensation, valve seat technology, used in valve devices, cocks including cut-off devices, engine components, etc., can solve the spherical surface error, uneven wear of the ball and valve seat sealing surfaces, and uneven wear of the ball and the sealing surface. Wear and other problems, to achieve the effect of reliable sealing performance, reduce processing difficulty and manufacturing cost, and improve sealing ability

Active Publication Date: 2014-08-06
陕西航天泵阀科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the perspective of product manufacturing and use, this type of hard-sealed ball valve has the following disadvantages: 1. Because the integral fully rigid metal seat itself has no compensation ability, the processing of the ball needs to reach a high level. 2. During the opening and closing process of the ball and the seat sealing surface of the ball valve, the friction conditions are different at different heights in the vertical direction, that is, the wear of the ball and the sealing surface is different. In addition, although the ball is matched with the seat sealing surface before assembly at the part that coincides with the seat sealing surface when it is closed, there are still some errors in the rest of the ball surface, so the ball and the seat sealing surface The wear of the whole process of opening and closing is also uneven wear
Judging from the actual application effect, this structure does not produce the compensation ability and effect that can meet the needs of use. The reason is that: in order to ensure the strength and reliability of the valve seat, the left side of the elastic groove needs to maintain sufficient thickness, groove The depth cannot be too deep, so it is difficult to obtain sufficient elastic deformation and compensation ability at the part of the elastic groove on the left side of the valve seat close to the sealing surface; It is very short and completely unable to produce deformation and displacement, which also makes the inside of the sealing surface unable to function even if it can produce bending deformation

Method used

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  • Ball valve metal valve seat with elastic compensation function and pressure auxiliary sealing function
  • Ball valve metal valve seat with elastic compensation function and pressure auxiliary sealing function
  • Ball valve metal valve seat with elastic compensation function and pressure auxiliary sealing function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as image 3 Shown is a schematic diagram of this embodiment. The valve stem (5) is connected with the sphere (4) through a flat position, the left side of the sphere (4) is the inlet valve seat (2), and the right side is the outlet valve seat assembly (7); the outlet valve seat assembly (7) is formed by the valve The seat body (7-1) and the support body (7-2) are composed of two parts, the valve seat body (7-1) and the support body (7-2) are arranged in a coaxial internal and external relationship, and the valve seat body (7-2) -1) The inside and the support body (7-2) are outside, the two are threaded and sealed and welded at the right end to connect the two into one; on the left side of the valve seat body (7-1), there is a The elastic arm (7-1-2) is bent outward toward the direction of the support body (7-2), the thickness is moderately thinned and has a certain elastic deformation capacity, and the front end of the elastic arm (7-1-2) is the valve seat The to...

Embodiment 2

[0032] Such as Figure 5 As shown, it is a schematic diagram of this embodiment, the outlet valve seat assembly (7) is composed of a valve seat body (7-1) and a support body (7-2), the valve seat body (7-1) is outside and the support body (7 -2) Inside, the two are combined with threaded connection, and spot welding or full circle welding is performed on the thread at the right end. After the valve is assembled and pressed, the rear side surface of the tongue (7-1-1) of the valve seat body (7-1) and the support body (7-2) fit in a plane; the outlet valve seat assembly ( 7) In the free state when not assembled with the sphere (4) and other parts, there is a small gap between the bonding planes of the tongue (7-1-1) and the support body (7-2) ; The elastic arm (7-1-2) in a curved shape and moderately thinned in thickness has a certain elastic deformation capacity.

[0033] After the valve is assembled, under the pressure of the disk spring (3), the inlet valve seat (2) sticks ...

Embodiment 3

[0035] For some pipeline systems and working conditions, solid substances such as impurities, metal oxidation products in the inner cavity of pipelines and equipment may exist in the flowing medium. During the opening and closing process of the valve, some small particles in these solid substances Once it enters the preset gap between the tongue (7-1-1) of the valve seat body (7-1) of the outlet valve seat assembly (7) and the support body (7-2), the elasticity of the corresponding part will Deformation is limited to a degree that may affect the sealing surface of the outlet valve seat assembly (7) reliably providing the required compensation after closing. Therefore, adding an anti-blocking structure on the outlet valve seat assembly (7) will help to further improve the sealing reliability of the valve seat structure proposed by the present invention.

[0036] Such as Figure 6 As shown, in this embodiment, the structure of the valve seat body (7-1) and the support body (7-2...

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Abstract

The invention discloses a ball valve metal valve seat with the elastic compensation function and the pressure auxiliary sealing function. The ball valve metal valve seat is mainly characterized in that an outlet valve seat assembly comprises a valve seat body and a supporting body which are combined through threads and weld joints; an elastic arm is arranged on the valve seat body, the elastic arm is bent towards the direction of the supporting body, the thickness of the elastic arm is properly reduced, the elastic arm has certain elastic deformation capacity, after a valve is assembled and pressed tightly, the tongue portion of the front end of the elastic arm is attached to the supporting body through a conical face or a plane, and when the valve is not assembled and is in the free state, a small gap is formed between the binding faces; an annular pressure cavity is formed between the elastic arm and the supporting body. The ball valve metal valve seat has the advantages that the sealing face portion of the valve seat has strong elastic compensation capacity, sufficient compensation can be provided when errors, uneven abrasion and high-temperature deformation exist in ball accuracy, and the auxiliary sealing function can be achieved with the assistance of medium pressure; the valve has the lasting and reliable sealing performance and meanwhile the ball machining difficulty and manufacturing cost are reduced.

Description

technical field [0001] The invention relates to a valve structure, in particular to a metal valve seat structure of a hard-sealed ball valve. Background technique [0002] The hard seal ball valve has the advantages of fast opening and closing speed, self-cleaning ability when the sealing surface is closed, the sealing surface will not be washed by the flowing medium in the open state, and the flow resistance and pressure loss are small after the valve is opened, so it is widely used in thermal power plants and other industries. And systems are more and more widely used, such as in large thermal power units, small and medium-sized hard-sealed ball valves are used in main steam, reheat steam drainage, air exhaust, feed water, desuperheating water partition, boiler water blowdown, steam overpressure Safety release and other aspects have a wide range of applications. Some products in this type of hard-sealed ball valves have the following operating conditions: they are mainly ...

Claims

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Application Information

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IPC IPC(8): F16K5/08F16K5/20F16K5/06
CPCF16K5/06F16K5/08F16K5/201
Inventor 章华
Owner 陕西航天泵阀科技集团有限公司