An inflatable seated butterfly valve designed for dry bulk solids or liquid slurry applications is available from Posi-flate. The valve is ideally suited for abrasive materials such as sand, feldspar, fly ash and several other dry, granular materials, which reduce valve life.
The inflatable seat design provides a better seal by utilising 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 utilised to verify a perfect seal.
Two series are available, a one-piece housing with separate shaft and disc, and a split housing design with integral disc and shaft. Standard sizes range from 2” (50mm) to 30” (750mm). The valves are available in a wide variety of construction materials.