Is the centrifugal pump outlet check valve added before or after the stop valve?
Check valve is called non-return valve or check valve, and its role is to restrict the direction of fluid flow and prevent fluid from flowing backward. According to the action of the valve disc, it can be divided into lifting type and swing type.General lifting check valves can only be installed on horizontal pipelines, while swing check valves can be installed on horizontal, vertical or inclined pipelines. Type check valve has better sealing performance than swing check valve, but the resistance is greater. When the process pipeline allows fluid to flow in only one direction, check valves are used. For example, the boiler inlet pipe must be installed with a check valve to ensure that only soft water is allowed to enter the boiler, and water and steam in the boiler are not allowed to flow backward. In general, in addition to the regulating valve at the outlet of the centrifugal pump, a check valve must also be installed to prevent fluid from flowing backwards, hitting the gear blades, damaging the blades, and shortening the life of the pump.
A check valve is a valve that automatically prevents the fluid from flowing backwards. The valve flap of the check valve opens under the effect of fluid pressure, and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than the outlet side, the valve flap automatically closes under the effect of fluid pressure difference, gravity itself and other factors to prevent fluid from flowing backward.