A two-stage buffer type anti-hammer coaxial valve

Abstract

The invention discloses a two-stage buffer type anti-water-hammer coaxial valve. A left bushing is arranged between a left end cover and a left cylinder, an intermediate cylinder cover is arranged between the left cylinder and a right cylinder, a right bushing is arranged between a right cylinder cover and the right cylinder, and seal rings are embedded in the insides of the left bushing and the right bushing. A left piston capable of sliding freely is arranged in the left cylinder, the cavity of the left cylinder is divided into a first left cavity and a first right cavity by the left piston, and a valve spool penetrates the left cylinder and the right cylinder and is integrated with a right cylinder piston. The cavity of the right cylinder is divided into a second left cavity and a second right cavity by the right cylinder piston, two air inlets are formed in one side of the left cylinder and the right cylinder respectively, a pilot valve is fixed on the outside of the left cylinder through screws, a pilot valve is fixed on the outside of the right cylinder through screws, and air control ports are formed in the pilot valves. The valve has the advantages that actions of the pistons are controlled by the different air inlet sequence, and accordingly, two-stage actions of the valve spool are achieved, closed impacting caused by fluid columns during instantaneous opening and closing of the valve spool is prevented, and the closed water hammer is eliminated fundamentally.

Description

technical field [0001] The invention relates to the technical field of valve bodies, in particular to a two-stage buffer type anti-hammer coaxial valve instrument. Background technique [0002] Coaxial valve is a kind of stop valve in fluid control engineering, which is widely used. It adopts the coaxial method of fluid flow channel and pipeline to minimize pressure loss and reduce resistance. The closing speed of the traditional shut-off valve spool is very fast. Generally, the shut-off valve is installed on the pipeline connected to the pump outlet and is close to the pump outlet. When the shut-off valve is closed quickly, the sudden change of pressure may directly damage the pump. . At present, the most used globe valves in pipeline systems are generally ball valves and angle seat valves. When the valve is closed in a short time, water hammer phenomenon will occur in the pipeline, and the water hammer wave will directly act on the globe valve, which will cause damage t...

AI Technical Summary

Problems solved by technology

The reason for the low closing sound of the silent globe valve is that the movement distance of the valve plate is short, but it cannot eliminate the water hammer; the hedging globe valve is actually a hydraulic damping globe valve; Too many faces, high manufacturing cost

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