Gas pipeline check valve

Abstract

The invention discloses a gas pipeline check valve. The gas pipeline check valve comprises a valve body and a valve clack, wherein the valve clack is closely fit with the inner sealing surface of the valve body; a rotating shaft is fixedly connected to the valve clack and hinged to the valve body, the other end of the rotating shaft extends out of the valve body and is connected with a rocker for opening or closing the valve clack, and the rotating shaft is in seal fit with the hinging part of the valve body; the gas pipeline check valve further comprises a limiting device for limiting the position of the valve clack after the valve clack is opened; the limiting device comprises a transmission mechanism which is fixed on the valve body and a check block which is arranged on the lower end of the rocker and used for limiting the rocker; and the transmission mechanism is fixedly connected with the check block. The gas pipeline check valve is simple to operate and convenient to maintain, the pressure loss of gas which flows through the gas pipeline check valve in a working process is small, and the valve clack can be automatically controlled to be closed so as to avoid backflow when the gas pipeline check valve stops working.

Description

technical field [0001] The invention belongs to the technical field of one-way valves, in particular to a gas pipeline check valve. Background technique [0002] The check valve is a valve that can automatically prevent the backflow of fluid. The disc of the check valve opens under the action of fluid pressure, and the fluid flows from the inlet side to the outlet side. It automatically closes under the action of gravity and other factors to prevent the fluid from flowing backward. The function of this type of valve is to only allow the medium to flow in one direction and prevent the flow in the opposite direction. Most of the existing check valves work automatically , Under the action of fluid pressure flowing in one direction, the valve disc opens; when the fluid flows in the opposite direction, the valve disc is sealed on the valve seat by the fluid pressure, elastic force or the self-weight of the valve disc, thereby cutting off the flow. [0003] Gas delivery pipelines...

AI Technical Summary

Problems solved by technology

[0003] Gas delivery pipelines have relatively high pressure loss requirements, and most of the check valves currently on the market rely on the flow of the gas itself to automatically open and close the disc, and the pressure loss of the gas flowing through the check valve is relatively large. In order to reduce the gas pressure loss, the valve disc usually uses a non-return diaphragm made of lighter material. The downstream or reverse flow of the gas medium breaks and loses the effect of preventing medium backflow. In addition, the traditional check valve lacks monitoring means, so it is impossible to judge whether the check valve is working normally

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