Wafer Butterfly Valve
The wafer style butterfly valve is designed to maintain a seal against bi-directional pressure differential to prevent any backflow in systems designed for unidirectional flow. It accomplishes this with a tightly fitting seal; i.e., gasket, o-ring, precision machined, and a flat valve face on the upstream and downstream sides of the valve.
A wafer butterfly valve's function is to retain a seal to protect against dual-directional pressure differential in the flow of fluid. In other words, the wafer version of butterfly valves was designed to hold a tight seal, safeguarding against bi-directional pressure differential in order to avoid any backflow in systems that have been manufactured for uni-directional flow.
Body materials ：carbon steel, stainless steel, Alloy Steel, Duplex Steel.
special material (duplex, inconel)
Body Material: WCB, CF8, CF8M, CF3, CF3M, CAST IRON ,A105 ,904L ,etc.
Valve seat materials ：inconel, others on request
Seal materials graphite / stainless steel, inconel, stainless steel, PTFE
Size range(s)：NPS 2 - 48 (DN50 - 1200)
Pressure rating：ASME Classes 150 - 600
Disc Sealing: PTFE, Graphite Laminated
Operation: Lever, Gear, Electric, Pneumatic, Hydraulic
Standards:ASTM, ANSI,AWWA, JIS,BS, GOST, DIN 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/API6D/EN12266-1