The H44X rubber disc check valve adopts an inclined structure, ensuring smooth water flow throughout the entire drainage area. The main components of the valve are: valve body, valve cover, steel shaft, and rubber plate. The check rubber flap is made of steel plate covered with reinforced nylon cloth and covered with Nitrile rubber as a whole. The rubber coating is closely bonded, with accurate geometric dimensions and good sealing elasticity, so that the steel plate can be completely isolated from the fluid. In order to make the valve flap have good opening and closing elasticity, the upper part of the valve flap is designed without steel skeleton. The back of the rubber flap is designed with an elastic limit device. When the rubber flap is closed in place, it forms a 45 ° angle with the valve axis to reduce the opening resistance, Realize fast opening and closing. The valve cover and valve body are sealed with an O-ring, and the rubber disc can have a switching life of 1 million times.