Screwing opening type check valve capable of balancing pressure automatically

Abstract

The invention relates to a screwing opening type check valve capable of balancing pressure automatically. The check valve comprises a valve body. An inlet and an outlet are arranged in two ends of the valve body on the same horizontal line, a valve seat is arranged on one side in the valve body facing the outlet, a horizontal valve shaft perpendicular to the axes of the inlet and the outlet is arranged above the valve seat, a valve clack matched with the valve seat is hinged to the horizontal valve shaft, a valve cover is arranged on the upper side of the valve body, an exhaust hole is formed in the valve cover and is communicated with a communication pipe on the inlet side of the valve body, the exhaust hole is closed through a valve element, and a spring assembly sleeves the valve element to control lifting of the valve element. Compared with the prior art, the check valve can achieve the effect that the pressure of the outlet side of the valve body can be controlled conveniently to prevent water hammers and prolong the service life.

Description

technical field [0001] The invention relates to a check valve, in particular to a swing check valve with automatic pressure balance. Background technique [0002] Swing check valve is the most commonly used check valve in industrial systems, it can be applied to various fluid media and high temperature and high pressure media. It is a valve that is automatically opened and closed by the force generated by the fluid flow in the pipeline, also known as check valve or one-way valve. The swing check valve is installed on the horizontal pipeline. When the fluid flows forward, the fluid flows into the swing check valve from the inlet, and the force generated by the forward fluid flow pushes the disc to overcome its own gravity and move upward around the valve axis. Turn off the seat to open the swing check valve. When the fluid flows in the reverse direction, the fluid flows into the swing check valve from the outlet, and the valve disc rotates rapidly downward around the valve ...

AI Technical Summary

Problems solved by technology

However, due to the large closing stroke (>75°) of the swing check valve, the backflow time is long during the closing process, so that the fluid generates a large kinetic energy, and at the same time it cannot dissipate the energy at the moment of closing, so the kinetic energy is instantly converted into potential energy. , so that the static pressure of the fluid in the pipeline rises rapidly, which may cause a relatively destructive water hammer phenomenon to the pipeline system

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