Sell Knife Gate ValveNPS: DN50-1200mm PN: 0.6-1.6Mpa Actuator: Manual, , gear wheel, pneumatic, electric, hydraulic, chain wheel Material: Body/disc: Cast iron, carbon steel, stainless steel Ring: Rubber, PTFE, SS, alloy steel Standard: Design&manufacturer: JB/T 8691, MSS SP-81 FACE-TO-FACE:...