Use these butterfly valves in severe-service applications
Series 585 and 586 inflatable seated butterfly valves (photo) are designed for the most severe of applications. The new heavy-duty seat has been designed for high operating pressures and temperatures. Standard valve sizes range from 2 to 24 in. (50 to 600 mm) and fit both ANSI and metric flanges. A full line of actuators, limit switches and controls are available to suit individual applications. Housing material options include: cast iron, stainless steel, aluminum, nickel-plated cast iron, epoxy-coated cast iron and nylon-coated cast iron. As the valve rotates into the closed position, the disc makes only casual contact with the seat, reducing friction, wear and torque requirements. After the valve is closed, the seat inflates against the disc, providing more sealing surface and an even pressure distribution against the disc. Before the valve opens, the seat is first deflated. The disc is then free to rotate to the open position. Booth 1008 — Posi-Flate, St. Paul, Minn.