Posi-flate
The Series 585/586 inflatable seated butterfly valves (photo) are designed for the most severe of applications. The heavy-duty seat has been designed for higher operating pressures and temperatures. Standard valve sizes range from 2 to 24 in. (50–600 mm) and fit both ANSI and metric flanges. The valve is ideally suited for abrasive materials, such as sand, feldspar, flyash and most other dry, granular materials. 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. The valves are available in a wide variety of construction materials, including stainless steel and aluminum. — Posi-flate, St. Paul, Minn.