Butterfly spherical valve

Abstract

The invention discloses a butterfly spherical valve, and relates to the field of butterfly valves. The butterfly spherical valve comprises a valve body, a valve shaft, a spherical disc plate, a valveseat, an inlet flange body, a sealing ring and an elastic part. The inlet flange body is fixedly connected with one side of the valve body, the valve shaft is rotationally connected with the valve body, the spherical disc plate is arranged inside the valve body, one side of the spherical butterfly plate is connected with the valve shaft, the outer side face of the valve seat is of a step structure, the step structure sequentially comprises a first step, a second step and a third step towards the direction far away from the spherical disc plate, the inner side surface, close to the valve seat,of the inlet flange body is provided with a convex part, the outer side surface of the third step abuts against the inner side surface of the convex part, the outer side surface of the second step abuts against the inner side surface of the valve seat, and the sealing ring is arranged between the second step and the convex part. The technical problems in the prior art are solved, and low sealing performance easily caused by the mechanical wear of the valve seat is avoided.

Description

technical field [0001] The invention relates to the field of butterfly valves, in particular to a butterfly spherical surface valve. Background technique [0002] Butterfly valve, also known as flap valve, is a regulating valve with simple structure, which can be used for switch control of low-pressure pipeline medium. A valve that can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays the role of cutting and throttling on the pipeline. The opening and closing part of the butterfly valve is a disc-shaped butterfly plate that rotates around its own axis in the valve body to achieve the purpose of opening and closing or adjustment. [0003] The sealing principle of the butterfly valve in the prior art when it is closed is: when the valve is closed, through the rotation of the valve plate, the outer circular sealing surface of the valve plate squeezes the seal...

AI Technical Summary

Problems solved by technology

[0003] The sealing principle of the butterfly valve in the prior art when it is closed is: when the valve is closed, through the rotation of the valve plate, the outer circular sealing surface of the valve plate squeezes the sealing ring of the valve seat, so that the valve seat generates elastic force as the sealing specific pressure to ensure The sealing of the valve, but in the process of continuous closing of the valve plate in the prior art, it rubs against the sealing ring of the valve seat for many times. Under mechanical wear, it is easy to cause the sealing performance between the two sealing surfaces to decline. It exists: the valve seat The technical problem that is likely to cause the sealing performance to decline after mechanical wear and tear

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