Model: D241X-1 Diameter Internal: 500-1000mm D241-0.6 Dinameter Internal: 1200mm Suitable for: water, petrol, Sewerage dircharge and treatment, power plant. Materials: Valve body:TH200(GB5675-85) Valve base:ZHMn58-2-2(GB1176-87) Disc: TH200(GB5675-85) Seal: Butadiene nitrile Valve Stem: 35( GB-699-88)2Cr13(GB1220-84) Filler: NBR(GB5577-85) If you are not satisfactory with these materials and standard, Please let us know you requirements and standard will adopt. Welcome to order from us and your inquiry shall be replied within two days at most.