Rubber disc check valve is composed of valve body, valve cover, valve disc and spring. It is mainly used at the outlet of pipeline of water supply and drainage system, petroleum, chemical industry and other industrial departments to prevent medium countercurrent. Because the sealing ring of this product is inclined design, the closing time is short, and the water hammer pressure can be reduced. The valve disc is made of NBR and steel plate by high temperature pressing. It has good erosion resistance, good sealing performance and production. The product has simple structure, convenient maintenance, maintenance and transportation.