Working Characteristics Of Stainless Steel Check Valves

The working characteristics of the check valve are that the load changes greatly, the opening and closing frequency is small, and the application cycle is very long as it is put into the closed or open state, and it does not require the movement of moving parts. However, once the requirements are "switched", they must be moved flexibly, which is more demanding than the usual mechanical movements. Since the check valve is qualitatively determined to be used for rapid closing in most practical uses, and at the moment when the check valve is closed, the medium flows in the direction of the disc, and with the closure of the valve disc, the medium rapidly decreases from the maximum reverse flow speed to zero, while the pressure rises rapidly, that is, the "water hammer" phenomenon that may have a destructive effect on the pipeline system is generated. For high-pressure piping systems where multiple pumps are connected in parallel, the problem of water hammer on check valves is even more prominent. Water hammer is a kind of pressure wave in the transient flow in the pressure pipeline, which is the hydraulic shock phenomenon caused by the change of fluid flow rate in the pressure pipeline. The physical cause is the combined effect of the incompressibility of the fluid, the inertia of the fluid motion and the elasticity of the pipeline. In order to prevent the hidden danger of water hammer in the pipeline, over the years, people have adopted some new structures and new materials in the design of the check valve, and gratifying progress has been made in reducing the impact force of the water hammer to a minimum while ensuring the applicable performance of the check valve.