Stainless steel check valves, also known as backflow valves, check valves, backpressure valves, and one-way valves. This type of valve is an automatic valve that automatically opens and closes due to the force generated by the flow of the medium itself in the pipeline. Check valves are divided into lift check valves, swing check valves, and disc check valves.

 

The working characteristics of stainless steel check valves are large load changes, small opening and closing frequency, and a long application cycle when put into the closed or open state, without requiring the movement of moving parts. Due to the fact that check valves are qualitatively determined to be used for quick closure in most practical applications, the medium flows in the direction at the moment of closure of the check valve. As the valve disc closes, the medium rapidly decreases from a larger backflow velocity to zero, while the pressure rapidly increases, resulting in a "water hammer" phenomenon that may have a destructive effect on the pipeline system. For high-pressure pipeline systems where multiple pumps are connected in parallel, the water hammer problem of the check valve is more prominent. Water hammer is a type of pressure wave in transient flow in pressure pipelines, which is a hydraulic shock phenomenon caused by changes in fluid velocity in the pipeline, resulting in pressure rise or fall. The physical reason for its occurrence is the combined effect of the incompressibility of the fluid, the inertia of fluid motion, and the elasticity of the pipeline. In order to prevent water hammer hazards in pipelines, for many years, people have designed check valves to reduce the impact force of water hammer while ensuring the applicable performance of check valves.