Pipeline evacuating valve

Abstract

The present invention discloses one kind of pipeline evacuating valve. The pipeline evacuating valve includes valve body with water inlet and water outlet, bi-directional door with single-directional door on the left wall and inlet pipe on the top wall and float inside the valve body, lever in the upper part with movable end aligning the top of the float and fixed end hinged to the valve wall, sealing sheet on the lever capable of covering the gas exhaust port when the lever is pushed upwards and opening the gas exhaust port when the lever is made to fall down. The present invention can realize reverse water supply and automatic evacuating pipeline after stopping water supply, and is suitable for water supply and gas supply pipeline.

Description

Technical field [0001] The invention belongs to a pipeline on-off control device. Background technique [0002] At present, the existing pipeline emptying valve is composed of a valve body with inlet and outlet ports, spring control floats, rubber plugs, air inlet pipes, etc. The rubber plugs block the air inlet pipe to prevent water from entering, and water flows out of the air inlet pipe to stop the water supply. When the negative pressure is generated in the pipeline, the air inlet is opened to complete the pipeline emptying. The disadvantage is that after the pipeline is empty, there is a pressure difference between the pipeline and the outside, which affects the next water supply; when the emptying pipeline is less than 3 meters in height, the inside of the pipeline The negative pressure generated cannot overcome the pressure of the spring, the intake pipe cannot be opened, and the pipe cannot be emptied; the height of the exhaust pipe is greater tha...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing pipeline emptying valve is composed of a valve body with an inlet and an outlet, a spring-controlled float, a rubber plug, and an air intake pipe. The rubber plug blocks the air intake pipe to prevent water ingress. When negative pressure is generated in the pipeline, the air inlet hole is opened to complete the pipeline emptying. The disadvantage is that after the pipeline is emptied, there is a pressure difference between the inside and the outside of the pipeline, which will affect the next water supply; when the height of the emptying pipeline is less than 3 meters, the inside of the pipeline will The negative pressure generated cannot overcome the pressure of the spring, the intake pipe cannot be opened, and the pipe cannot be emptied; the height of the exhaust pipe is greater than 5 meters.

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