China Double Flanged Butterfly Valves seat synthetic rubber. When you close the disc's outer sealing surface squeezed synthetic rubber seat, so the seat is elastically deformed to form an elastic force as a seal than the pressure to ensure the valve seal. Well-known domestic manufacturers have the right to Shanghai Valve Equipment Co., Ltd. and Hunan new hydropower equipment. His company is the Ministry of Machinery Industry, Ministry of Chemical Industry, China National Chemical Equipment Corporation sentinel production management companies. Its products in the industry have a price advantage and technological advantages. Flange butterfly valve structure using PTFE, synthetic rubber composite seat, which is characterized in that the resilient synthetic rubber valve still provide and utilize low coefficient of friction of PTFE, easy to wear, easy to aging and other characteristics, so that butterfly's life can be improved. Product link: http: //www.landee.cn/double-flanged-butterfly-valves.html