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Fisher
r
POSI‐SEAL
t
A81 Rotary Valve
Contents
Introduction 1...................................
Scope of Manual 1............................
Specifications 2...............................
Description 4.................................
Installation 4....................................
Maintenance 8..................................
Packing Maintenance 9........................
Replacing the Seal Ring Assembly 12..............
Replacing the Disk, Shafts, or Bearings 13..........
Actuator Mounting 18.........................
Parts Ordering 18
................................
Parts Kits 19...................................
Parts List 20...................................
Figure 1. Fisher A81 Valve with FieldQ™ Actuator
W9479
Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and parts information for the Fisher POSI‐SEAL A81 valve,
DN50 through DN300 or NPS 2 through NPS 12 (figure 1). Refer to separate instruction manuals for information
covering the power on‐off actuator and accessories.
Do not install, operate, or maintain an A81 valve without being fully trained and qualified in valve, actuator, and
accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to
carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If you
have any questions about these instructions, contact your Emerson Process Management sales office before
proceeding.
Instruction Manual
D103302X012
A81 Valve
January 2011
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