High Performance Butterfly Valves
Fisher® High Performance Butterfly Valves feature an eccentrically mounted disc and are known for their wide application range and shutoff capability. They are available for a variety of control and isolation service from cryogenic to high temp and pressure classes to ASME CL2500 and sizes from NPS 2 to 72.
POSI-SEAL™ High Performance Butterfly Valves are designed for isolation on/off service as well as low tier control. The POSI-SEAL valves feature keyed, double D or square valve shafts. The POSI-SEAL valves are available in sizes NPS 2 to 72, pressure classes up to CL2500. Shutoff is provided by a variety of seals which include metal, PTFE and fire-tested and cryogenic.
Fisher 8510 wafer valve has a splined shaft for throttling control. These valves feature an eccentrically mounted disk and a PTFE stainless steel seal ring.
Fisher 8510B  is a multi-class rated flangeless valve for throttling control. 8510B is available with a splined shaft or a double D shaft.
Fisher 8532 high-performance butterfly valve has a splined shaft for throttling control. With a variety of seals, it can be used in most industry applications.
Fisher 8560 high-performance butterfly valves have a splined shaft for throttling control. With a variety of seals, it can be used in most industry applications.
Fisher 8580 rotary valves offer excellent throttling performance. An approximately linear flow characteristic provides precise throttling control.
Fisher 8590 rotary valves offer excellent throttling performance with a spline shaft and a linear flow characteristic. Square and keyed shaft options are also available for use in on-off service.
Control-Disk rotary valves allow you to control closer to the target set point which results in a reduction in process variability.
POSI-SEAL A11 butterfly valves feature a keyed or square-end shaft for on-off applications. Available in flangeless or a single-flange style.
POSI-SEAL A31A butterfly valves feature a keyed shaft for on-off service.  Available in either a flangeless or a single-flange.
POSI-SEAL A31D double-flange butterfly valves feature either a splined drive shaft or a keyed drive shaft for either throttling or on-off service.
POSI-SEAL A41 high-performance butterfly valves feature a double D shaft for on-off service. A41 is part of the POSI-SEAL Package
POSI-SEAL A81 rotary valve with FieldQ rack-and-pinion actuator offers automated on-off, quarter-turn performance.