Butterfly valve without valve seat and soft sealing method thereof

A soft-seal, butterfly valve technology, applied in lift valves, valve devices, mechanical equipment, etc., can solve problems affecting valve reliability, dust accumulation, water accumulation, etc., to ensure smooth and sealing performance, increase service life, and reduce costs. Effect

Pending Publication Date: 2019-10-22
DALIAN CONSERVATION SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, the existence of the valve seat can easily cause dust accumulation and water accumulation, which can easily cause structure or agglomeration, which will affect the sealing of the valve or the reliability of use.

Method used

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  • Butterfly valve without valve seat and soft sealing method thereof
  • Butterfly valve without valve seat and soft sealing method thereof
  • Butterfly valve without valve seat and soft sealing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] A butterfly valve, such as figure 1 and 2 As shown, it includes a valve body 1, a valve plate 2, a valve stem 5, two valve stem sleeves 6 with flanges 61, a flange gland 7 corresponding to the flanges 61, an actuator 9, and a support 10, The support 10 is located on the valve body 1 and is integrated with the valve body 1 to fix the actuator 9 . The valve body 1 is provided with two through holes symmetrical to the central axis of the valve body 1 along its radial direction, and the two valve stem sleeves 6 are respectively fixed on the two through holes of the valve body 1, and the valve stem 5 passes through Into two valve stem sleeves 6, the inner diameter of the valve stem sleeve 6 is larger than the inner diameter of the valve stem 5, and the inner diameter near the end of the valve body is relatively small, slightly larger than the shaft diameter of the valve stem 5, and forms with the valve stem 5 Sliding fit, the inner diameter of the other end of the valve st...

Embodiment 2

[0085] A kind of butterfly valve, on the basis of embodiment 1, its soft sealing ring 31 is a flexible pipe, and the cross section cut perpendicular to its axis is oval, as image 3 As shown, the minor axis of the elliptical cross-section intersects the radially outer surface of the valve plate at its position and is perpendicular to the tangent of the radially outer surface of the valve plate at the intersection point, that is, the elliptical cross-section The major axis of the valve body is basically parallel to the corresponding radial outer surface or inner surface of the valve plate or valve body where it is located. Compared with Embodiment 1, the soft sealing ring of this shape is filled with medium into its medium inlet and outlet E, so that the soft sealing ring is deformed and attached to the inner wall of the valve body 1, and the soft sealing ring is not even needed. Elastic expansion occurs, which effectively realizes the sealing of the valve. The smaller the exp...

Embodiment 3

[0087] A square butterfly valve, the soft sealing structure 3 on each radial side of the valve plate 2 also includes an elastic clip or buckle 33; the elastic clip or buckle 33 is a slotted metal tube sleeved on the soft sealing ring 31 is externally fixed on the radial surface of the valve plate 2, coaxial with the soft sealing ring 31, and its cross-sectional shape is consistent with the cross-sectional shape of the corresponding soft sealing ring 31; as image 3 shown.

[0088] The notch of the slotted metal pipe runs through from the beginning to the end along its axial direction, and when the valve is closed, the notch faces the radially inner surface or inner wall of the valve body 1 opposite to the valve plate 2 .

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Abstract

The invention relates to a butterfly valve without a valve seat and a soft sealing method of the butterfly valve without the valve seat. The butterfly valve comprises a valve body and a valve plate, the outer diameter of the valve plate is smaller than the inner diameter of the valve body, and a soft sealing structure is sleeved and fixed along the radial outer surface of the valve plate; the softsealing structure comprises a soft sealing ring, and the soft sealing ring is internally provided with an internal annular communicating cavity; the butterfly valve is provided with a medium inlet and outlet pipeline to communicate with the cavity of the soft sealing ring; and in the closed state of the butterfly valve, the soft sealing ring is close to the inner wall of the valve body. After thebutterfly valve is closed, the cavity of the soft sealing ring is filled with a medium through the medium inlet and outlet pipeline, and the soft sealing ring is attached to the inner wall of the valve body after being deformed or displaced, so that the butterfly valve is sealed; before the butterfly valve is to be opened, the medium in the cavity of the soft sealing ring is discharged through the medium inlet and outlet pipeline, the soft sealing ring automatically restores to the original shape, and then the butterfly valve is opened. The sealing problem of the butterfly valve is effectively solved, the structure is reasonable, the sealing effect is good, and the service life is long.

Description

technical field [0001] The invention relates to a butterfly valve, in particular to a seatless butterfly valve and a soft sealing method thereof. Background technique [0002] Many flues or pipes will use butterfly valves or flapper valves in large numbers. Taking the flue or pipeline with low pressure as an example, one of flue butterfly valves or flapper valves is generally used today. The difference between the two is mainly reflected in: 1. The plug-in valve uses a straight stroke actuator to drive the valve plate to move up and down or left and right to realize the valve switch; the butterfly valve uses a 90-degree angular stroke rotary actuator or a straight stroke with a short stroke. The stroke actuator drives the crank to realize the switch of the valve. 2. Outside the valve body of the plug-in valve, a frame needs to be connected to fix the actuator to drive the switch of the valve plate. The size of this frame depends on the size of the valve plate, which is usu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16K1/36F16K1/22F16K1/226F16K1/46
CPCF16K1/36F16K1/22F16K1/2261F16K1/46
Inventor 王嘉贤孙玉忠尹刚刘超
Owner DALIAN CONSERVATION SCI & TECH CO LTD
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