knife gate valve BS;DIN F4,F5;AWWA C509/C515;ANSI with iso9001, CE and WRAS certificate high quality and reasonable price knife gate valve1.Face to Face: EN 558-1, MSS2.Flanged ends: DIN 2501, BS 4504, ANSI B16.103.Test & Inspection: DIN 32304.Operator: handwheel, nut, extension stem, gear operator5.DN:40-1000mmbody: ductile ironknife: SS304, SS316U seat: EPDM/NBRstem: 2Cr13, SS410, SS304stem nut ...