What does the check valve do for VFD / VSD Inverter Constant Pressure Booster Pump?

There are two places that need to have a check valve for a VFD / VSD Inverter Constant Pressure Booster Pump. The first one is before the inlet of the pump which could prevent water back flowing from the pump to the water resource and make sure the pump to have suction lift capability. The second one is after the outlet of a VFD / VSD Inverter Constant Pressure Booster Pump which could prevent water back flowing from discharge port to the pump, water hammer to damage the pump, and to maintain the pressure in the pressure tank of a VFD / VSD Inverter Constant Pressure Pump.

Click here to learn about a Faster + Easier + Silent Constant Pressure Solution