Fisher High Performance Butterfly Valve A31D

The Fisher A31D double-flange high-performance butterfly valve provides outstanding performance under extreme pressure and temperature conditions. The A31D valve is available with face-to-face dimensions conforming to ISO 5752 Butterfly Valve Short (CL150) or Long (CL300) Series (for other face-to-face dimension requirements, consult your Emerson Process Management sales office). A splined shaft combines with a variety of Fisher spring-and-diaphragm or pneumatic piston actuators. A keyed drive shaft combines with a variety of handlevers, handwheels, or pneumatic double-acting or spring-return piston actuators. These combinations make the A31D valve a reliable, high-performance butterfly valve for both throttling and on-off applications in the process industries. The A31D valve can be supplied with one of several dynamic seals (figure 1) that can be used in a variety of demanding applications. With the appropriate seal selection and materials of construction, the pressure-assisted seal provides excellent shutoff against the full ASME class pressure range.