The rubber flap check valve is mainly composed of the valve body, the valve cover, and the main parts of the rubber flap. The rubber is made of ductile iron flap and lined with EPDM or nitrile rubber. It has a long service life and is not easy to accumulate debris. Easy to maintain. This valve is suitable for water supply and drainage systems. It can be installed at the outlet of the water pump to prevent backflow and water hammer from damaging the pump valve. It can also be installed in the bypass pipe of the inlet and outlet water pipes to prevent pool water from flowing back into the water system.