The rubber check valve mainly consists of valve body, bonnet and rubber valve. The rubber flap is made of steel plate, steel rod and reinforced nylon fabric. The outer shell is made of rubber. The disc switch can last a million times. The valve adopts full - flow area design, with water head loss small. Not easy to accumulate sundries, maintenance and other features. The valve is mainly applicable to the water supply and drainage system, which can be installed at the outlet of the pump to prevent the backflow and water hammer from damaging the pump. The valve can also be installed in the pass-through pipe of the cistern to prevent water from pouring into the water supply system.