Fisher butterfly A11

​POSI-SEAL™ A11 is a high-performance butterfly valve featuring a keyed or square-end shaft for various on-off applications. A11 is available in NPS 3 through 24, CL600 (both keyed and square-end shafts), and NPS 30 through 48, CL150/150, CL150 and CL300. This valve is available in either a flangeless (wafer) style, or a single-flange (lugged style).

(a) Valve body sizes ANSI: NPS 3", 4", 6", 8", 10", 12", 14", 16", 18", 20", 24", 30", 36", 42", 48" inch
(b) Pressure Classes ANSI: CL150, 300, 600, 900, 1500 lbs
(c) Shaft Versatility
(d) Excellent Shutoff Integrity
(e) 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).
(f) Sour Service Capability
(g) High-Temperature/Cryogenic Capabilities— Optional valve constructions allow this valve to meet both high-temperature and cryogenic applications.
(h) Easy Installation
(i) Reliable Flange Gasketing Surface
(j) True Bidirectional Shutoff Performance
(k) Ease of Maintenance


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