Data Sheet

A81 Valve
D103301X012
Product Bulletin
21.1:A81
July 2012
16
FieldQ Actuator Features
 Simple, modular construction– Makes operation
and maintenance easier. The basic actuator module
includes the pistons, rack and pinion gear, springs
(for spring-return actuators), h ousing, and position
indicator. Pneumatic operation is accomplished
with an ASCO 8551 solenoid valve. The solenoid is
activated by a 120 VAC 60 Hz or 110 VAC 50 Hz
signal. It is pad mounted and does not require a
bracket. The basic actuator features built-in visual
position indication, travel stops for both directions,
and a balanced pinion design.
 Three Point Suspension System–Three carbon-filled
PTFE guide bands provide a low friction bearing
surface for piston alignment and rack support.
Elimination of metal-to-metal contact between
pistons and cylinder wall reduces friction for
outstanding cycle life, smooth piston travel, and
maximum power.
 Balanced Piston Design–As part of the design, three
equally spaced bearing surfaces are cast into each
piston. The rack and pinion construction results in
even distribution of bearing loads, optimum gear
engagement, and reduced piston tilt. Equal spring
force applied to each piston enhances actuator life.
 Multiple Constructions–Conversion from double
acting to spring return, or vice versa, is simple and
safe, thus reducing spare part requirements.
Valve/actuator action is also field reversible.
 Dual Stop Adjustment– This adjustment is standard
on all E Series actuators. The P Series actuators are
supplied with a limit plate adjustment feature.
 Dual Piston Design–Air pressure applies a balanced
force across the common pinion gear.
Symmetrically balanced center mount construction
eliminates undue stress on the valve stem,
bearings, and disk.
For further information, refer to:
http://www.emersonprocess.com/valveautomation/
fieldq/index.html
Emerson Process Management
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore
www.Fisher.com
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they arenot
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
E 2008, 2012 Fisher Controls International LLC. All rights reserved.
Fisher, POSI-SEAL, FieldQ, and ENVIRO-SEAL are marks owned by one of the companies in the Emerson Process Management business unit of Emerson
Electric Co. Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are
the property of t heir respective owners.
Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance
of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.