Whether the Check Valve is Installed Before the Pump or After the Pump

The check valve can be installed before and after the water pump. The check valve is installed in the water pump to fill the water pump once without pumping water, and the check valve is installed behind the water pump when the liquid level is higher than the water pump. When starting and stopping the water pump, it is not necessary to close the water outlet valve of the water pump, and control the water pump system to the parent to prevent the phenomenon of backflow.