Slow closing control device of check valve

Abstract

The invention relates to a slow closing control device of a check valve. The slow closing control device comprises an intake pipe, a first connecting pipe, a second connecting pipe, a cylinder and a hydraulic cylinder; a first inner cavity is formed in the cylinder; a first piston is arranged in the first inner cavity for dividing the first inner cavity into a first cavity body and a second cavity body; the first piston is extended with a first piston rod in the first cavity body; a second inner cavity is formed in the hydraulic cylinder; a second piston is arranged in the second inner cavity for dividing the second inner cavity into a third cavity body and a fourth cavity body; a second piston rod is arranged on the second piston; the first piston rod and the second piston rod are linked and matched; a throttle pipe is connected between the third cavity body and the fourth cavity body; a one-way throttle valve is arranged on the throttle pipe. The slow closing control device of the check valve, provided by the invention, can control the closing time of the check valve to eliminate a water hammer of the pipe so as to achieve a preferable effect of protecting safety of a pipe network system.

Description

technical field [0001] The invention relates to a slow closing control device of a check valve. Background technique [0002] Check valve refers to the valve that relies on the flow of the medium itself to automatically open and close the disc to prevent the backflow of the medium, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. The check valve is a kind of automatic valve, its main function is to prevent the reverse flow of the medium, the reverse rotation of the pump and the drive motor, and the discharge of the container medium. Check valves are also used on lines supplied by auxiliary systems where the pressure may rise above system pressure. However, in the existing check valve, the closing speed is too fast, and the closing time cannot be controlled, so that the water hammer in the pipeline cannot be eliminated. Contents of the invention [0003] Purpose of the present invention: In order to overcome the defects of the prior a...

AI Technical Summary

Problems solved by technology

However, the existing check valves are too fast to be closed, and the closing time cannot be controlled, so that the water hammer in the pipeline cannot be eliminated.

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