Fisher® POSI-SEAL A11 High-Performance Butterfly Valves0 pages

Product Bulletin

A11 Valve

21.1:A11
May 2013

D500203X012

Fisherr POSI-SEALt A11
High-Performance Butterfly Valve
The Fisher A11 High-Performance Butterfly Valve
maintains tight shutoff, and can be specified for a wide
range of pressure and temperature conditions,
including cryogenic applications.
The A11 valve is available in either a wafer or a
single-flange design (single-flange only for CL600, 900,
and 1500). A square or keyed shaft can combine with a
variety of handlevers, handwheels, or pneumatic
piston diaphragm actuators. A splined shaft can
combine with a variety of spring-and- diaphragm or
pneumatic piston actuators. These combinations help
make the A11 valve a reliable, high-performance
butterfly valve for both throttling and on-off
applications in the process industries.
The A11 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 helps provide excellent shutoff
against the full ASME class pressure range for the A11
valve.

W9570-1

Excellent Emissions Capabilities– The optional
ENVIRO-SEALt 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).

Sour Service Capability– Trim and bolting materials
are available for applications involving sour liquids
and gases. These constructions comply with NACE
MR0175-2002, MR0103, and MR0175 / ISO 15156.

Features

Shaft Versatility– This valve will meet your actuator
needs with a choice of square, keyed, or splined
shaft connections.

Excellent Shutoff Integrity–The pressure-assisted
seal design provides tight shutoff and permits the
use of smaller, less expensive actuators in
applications requiring full ASME B16.34 shutoff
capabilities.

High-Temperature/Cryogenic Capabilities–
Optional valve constructions allow this valve to
meet both high-temperature and cryogenic
applications (see table 7 for cryogenic and
high-temperature actuator configurations).

Easy Installation–The valve body self-centers on the
line flange bolts as a fast, accurate means of
centering the valve in the pipeline.

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