Concentric butterfly valve is generally used of a butterfly valve,the structure of rubber/PTFE seat has been designed as protecting body,and its usually apply to seawater, wastewater, ship-building industry etc.
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" ~ 24" (DN50 ~ DN600)
Rating: PN10,PN16, ANSI 150lb
Body Materials: cast iron, ductile iron, cast steel, stainless steel, Monel, al-bronze etc.
Seat: EPDM, NBR, PTFE
Operation: Lever, Gear, Electric, Pneumatic, Hydraulic
Wafer, wafer-lug, double flange ends
ISO top flange