API hard seal butterfly valve Temperature Range:-40~570 Applicable medium: water, steam,gas, oil acid,alkali etc. Main parts:body,disc,stem,seal ring, packing Drive: Manual, worm wheel drive,electric,pneumatic,hydraulic. Connection dimension: ANSI B16.5A-92 MSS SP-44-91 API609-83 Face to face dimension: ANSI B16.10-86 API 609-91 MSS SP-68-97 Pressure test: API 598-94 MSS SP-61-92 ANSI B16 37-80 We manufacture butterfly valves series, such as Metallic soft seal butterfly valve, Metallic hard sealing butterfly valve, Multiple layers metallic hard sealing butterfly valve, etc. We manufacture ball valves series, gate valves series,globe valves series,check valve series,filter valves series,butterfliy valves series, diaphragm valves series, plug valves series, safety valves series, reducing valves series, trap valves series, conv forged steel valves, cryogein valves, power-station valves. For more detailed information,please have a view of our website: