Fisher butterfly A81

POSI-SEAL™ A81 rotary valve with FieldQ™  rack-and-pinion actuator offers automated on-off, quarter-turn performance. It is available in spring-return and double-acting piston designs.

(a) Valve body sizes ANSI: NPS 2", 3", 4", 6", 8", 10", 12" inch
     Valve body sizes DIN: DN50, DN80, DN100, DN150, DN200, DN250, DN300 mm
(b) Pressure Classes ANSI: CL150 and 300 lbs
     Pressure Classes DIN: PN10, PN16, PN25, PN40 bar
(c) Quarter-turn performance
(d) Global Standards
(e) PEEK/PTFE bearing as standard
(f) Improved shaft-disk pinning
(g) New Spring-Loaded Shaft
(h) Excellent Emissions Capabilities— The optional ENVIRO-SEAL™ packing systems, are designed with very smooth shaft surfaces and live-loading to provide improved sealing, guiding, and loading force transmission. The seal of the ENVIRO-SEAL system can control emissions to below 100 ppm (parts per million).
(i) Sour Service Capability
(j) Easy Installation
(k) Excellent Shutoff Regardless of Pressure Drop
(l) Long Seal Life
(m) Reliable Flange Gasketing Surface
(n) Integral Shaft-to-Valve Body Bonding
(o) Powder paint as standard
(p) High Temperature Capability— The valve will operate at elevated temperatures, with the appropriate trim components.
(q) Shaft Retention
(r) Travel Indication



Magnus Dahlén
Joachim Nyqvist
Joakim Karlsson
Jukka Haikala
Kim Larsen
Satu Mäkelä
Erik Rune