Butterfly Valve, Gate Valve, Check Valve manufacturer / supplier in China, offering Ductile Iron Bi-Directional Knife Gate Valve Rubber Seat Gear Operated, DN1200 Pn10 China Sluice Knife Gate Valve Ductile Iron Bidirectional Knife Gate Valve Factory Rubber Seat Gear Operated Water Wafer Lug Knife Gate Valves, Lug Type Resilient Seat Manual Operated Uni-Directional Knife Gate Valve and so on.