Concentric butterfly valves are generally used of a butterfly valve,the structure of rubber/PTFE seat has been designed as protecting body,and its usually apply to seatwater industry.
Design Standard: API 609, MSS SP-67, MSS SP-68, BS 5155
Face to Face: API 609, ASME B16.10, BS 5155, EN1092
End Connection: ASME B16.5, ASME B16.47
Inspection and Test: API 598
Size: 2" ~ 96" (DN50 ~ DN2400)
Rating: PN10,PN16, ANSI 150lb
Body Materials: Cast Iron, Ductile Iron,Cast steel,Stainless steel,Ni_Al_Bronze etc.
Operation: Lever, Gear, Electric, Pneumatic, Hydraulic
Wafer, wafer-lug, double flange ends
ISO top flange