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Single eccentric hard sealing butterfly valve

A hard seal, single eccentric technology, applied in the direction of lift valves, valve devices, engine components, etc., can solve the problems of large operating torque, difficulty in achieving two-way sealing, and inability to eliminate radial secondary eccentricity, so as to eliminate unbalanced torque Effect

Inactive Publication Date: 2007-02-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the shortcoming of excessive operating torque of the double eccentric hard seal butterfly valve, people have invented the triple eccentric hard seal butterfly valve.
Compared with the double eccentric hard seal butterfly valve, the secondary eccentricity of the valve stem position along the radial direction of the butterfly plate has been greatly reduced. If it is eccentric to the secondary, it is impossible to eliminate the unbalanced moment. When used in high-pressure medium, it is difficult to meet the requirements of two-way sealing

Method used

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  • Single eccentric hard sealing butterfly valve
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  • Single eccentric hard sealing butterfly valve

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Experimental program
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Effect test

Embodiment Construction

[0009] Such as figure 1 As shown, the single eccentric hard seal butterfly valve includes a valve body 6, a valve stem 8, a butterfly plate 1 is arranged on the valve stem 8, a sealing ring 3 is arranged on the butterfly plate, a pressure plate 2 is pressed on the sealing ring, the valve body 6 and the sealing ring 3. The contour line of the projection surface of the middle section c-c of the sealing surface in the direction of the valve body cavity axis is composed of two elliptic curves, namely elliptic curve a1a2a3, elliptic curve b1b2b3 and two arc lines, namely arc line a1b1 and arc line a3b3 A closed curve formed by a smooth transition, the rotation axis of the valve stem 8 has only an eccentricity e1 along the axis of the valve body cavity relative to the middle section c-c of the seal ring 3 .

[0010] Such as image 3 As shown, the contour line a1a2a3b3b2b1a1 of the projection surface of the cross-section c-c of the sealing surface of the valve body 6 and the sealing...

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Abstract

The butterfly valve is composed of the valve body, the valve shaft with a butterfly board, on the butterfly board, the sealing ring and pressboard is installed, on the sealing surface the cross section of the valve body and sealing ring is c-c. Along the axial direction of the cylinder the projecting plane of the c-c is a close curve composed by the elliptical arc albl and a3b3. Corresponding with the section c-c, the rotary axis of the valve shaft has the only eccentric center el along the axis of the valve cavity, the butterfly valve is a single eccentric structure.

Description

technical field [0001] The invention relates to a butterfly valve, in particular to a single eccentric hard seal butterfly valve. Background technique [0002] Butterfly valves are widely used in pipeline systems due to their simple structure, small size and convenient operation. The earliest butterfly valve has a centerline structure, that is, the valve stem is placed at the symmetrical center of the butterfly plate, and the unbalanced moment generated by the medium pressure on the butterfly plate is zero. The butterfly valve with a centerline structure has a large interference area between the sealing surface of the butterfly plate and the sealing surface of the valve body during the closing process of the butterfly plate. In order to ensure that the butterfly plate closes in place, the inner wall of the overall valve needs to be lined with non-metallic elastic materials. In order to reduce the amount of sealing elastic material, people invente...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16K1/22
Inventor 刘汇源郑津洋
Owner ZHEJIANG UNIV