See inflatable-seated butterfly valves in operation
Posi-flate
This company manufactures a complete line of inflatable-seated butterfly valves (photo) for handling a wide variety of dry bulk-granular solids, liquids and gases. Standard sizes are from 2 to 30 in. (5 to 750 mm), and fit both ANSI and metric flanges. They are offered in a wide variety of construction materials, including stainless steel, ductile iron and aluminum. Standard finishes include urethane coating, nylon powder coating, epoxy coating, highly polished stainless-steel discs and bodies, plus almost any custom paint type and color. Various finishes are also available, from custom coatings to highly polished surfaces. The inflatable-seat design provides a better seal by utilizing air pressure to expand the seat against the disc, providing more sealing area and an even pressure distribution against the disc every time. The seat automatically compensates for wear when it inflates against the disc, extending valve life considerably. At the stand, the company will be exhibiting a heavy-duty inflatable seated butterfly valve operating next to a typical resilient-seated valve to demonstrate how quickly a resilient-seated valve can wear, in comparison to the air-operated valve. Hall 2, Stand 326 — Posi-flate, Milton Keynes, U.K.