An antifreeze pressure relief butterfly valve

Abstract

The invention provides an anti-freezing pressure relief butterfly valve and belongs to the technical field of valves. The anti-freezing pressure relief butterfly valve solves the problem that when anexisting butterfly valve is frozen, a valve clack is prone to deformation. The anti-freezing pressure relief butterfly valve comprises a valve body and a valve rod; the valve rod is rotationally arranged in the valve body in a penetrating manner in the radial direction; the valve rod is provided with a disk-shaped valve clack; the valve clack comprises a body and a pressure relief plate; one sideof the body is provided with a cavity; the pressure relief plate is made from a hard elastic material, and seals and covers the cavity of the body; the pressure relief plate and the body are in sealedconnection, and a pressure relief cavity is formed between the pressure relief plate and the body; and the pressure relief cavity communicates with the exterior of the valve body; and a supporting plate is fixed to the inner side face of the pressure relief plate, and a pressure cavity is formed between the supporting plate and the pressure relief plate. An elastic part is arranged between the body and the supporting plate; the body is provided with a pressure groove in the peripheral direction, and a rubber ring is arranged in the pressure groove; and the pressure cavity communicates with the pressure groove. The anti-freezing pressure relief butterfly valve can eliminate influences generated by freezing and has high sealing performance.

Description

Technical field [0001] The invention belongs to the technical field of valves and relates to an antifreeze pressure relief butterfly valve. Background technique [0002] The butterfly valve is also called the flap valve. It is a relatively simple regulating valve that can be used for the on-off control of pipeline media. The closing part of the butterfly valve is a disc, which rotates around the valve shaft to achieve opening and closing. With throttling effect, the butterfly valve forms a seal through the edge of the disc-shaped disc and the inner wall of the valve body. The two are usually hard seals, but with wear during use, the sealing effect of the hard seal will gradually become worse, especially Used in a low temperature environment, if the water at the water inlet end of the valve body freezes when the valve disc is closed, the volume of the water will expand after solidification. The expansion force is greater, and the valve body strength is higher, then expansion The ...

AI Technical Summary

Problems solved by technology

[0002] Butterfly valve, also known as flap valve, is a regulating valve with relatively simple structure, which can be used for switch control of pipeline medium. The closing part of butterfly valve is a disc, which rotates around the valve shaft to achieve opening and closing. Throttling effect, the butterfly valve forms a seal through the edge of the disc-shaped disc against the inner wall of the valve. The two are usually hard seals, but with wear and tear during use, the sealing effect of the hard seal will gradually deteriorate, especially When the valve is used in a low temperature environment, if the water at the inlet end of the valve body freezes when the valve disc is closed, the volume of the water will expand after solidification. The extrusion force will act on the disc, which will easily lead to deformation of the disc, which will lead to a decrease in sealing performance

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