The Posi-flate inflatable seated butterfly valve is ideally suited for abrasive materials such as sand, feldspar, fly ash and most other dry, granular materials which reduce valve life. 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. Because the Posi-flate disc only makes casual contact with the seat during opening and closing, torque requirements are substantially lower. This ease of movement also allows the disc to come to a perfect 90-degree position every time. Additionally, the smooth profile of the disc helps material flow easier and reduces build-up. For unique fail-safe monitoring, a pressure switch can be utilized to verify a perfect seal. Standard sizes range from 2” (50mm) to 30” (750mm). The valves are available in a wide variety of construction materials including stainless steel and aluminum.