Series 485, 486, 487, 488
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Inflatable Seated Butterfly Valves SERIES 485 486 487 488 ANSI and Metric Flange Compatible

Less friction, low torque, less wear, longer life. Posi-flate’s unique butterfly valve design uses air pressure to expand the seat against the disc, providing even pressure distribution for a bubble-tight seal, every time. Because the seat makes only casual contact with the disc during valve opening and closing, there is minimal disc impingement. This is in contrast to conventional butterfly valves where disc impingement leads to shaving of the seat, decreasing the overall performance and valve life. Substantially less torque is required to open and close the Posi-flate butterfly valve,...

reliable performance A. ACTUATOR MOUNTING FLANGE: Flange is designed for direct actuator mounting. B. RETAINING RING: Retaining ring simplifies bearing and seal removal and ensures positive bearing C. BEARINGS: Multiple bearings substantially reduce operating friction and torque requirements, contact, thus preventing shaft D. SHAFT SEALS: O-ring shaft seals insure positive sealing under the most adverse conditions. SHAFT: Corrosion resistant strength steel shaft is easily SEAT O-RING SEAL: O-ring provides long lasting positive seal of seat inflation pressure. MATERIAL SEAL: Land seal...

Available Materials of Construction: Housing: Cast iron, stainless steel, aluminum, nickel-plated cast iron, epoxy coated cast iron, nylon coated cast iron Resilient Seat: EPDM, Buna-N, silicone, FDA white Buna-N, FDA white EPDM, FDA white Disc: Cast iron, 316 stainless steel (satin or polished), molded nylon. PTFE, nickel and nylon coating Bearings: Polymer, bronze Disc Screws: Carbon steel, stainless steel Shaft: Zinc-plated carbon steel, Shaft Seal: Buna-N, Housing Gasket: Buna-N Retaining Ring: Carbon steel, stainless steel Housing Bolts: Carbon steel, stainless steel All specifications...