Emerson Fisher POSI-SEAL A81 - User Manual

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Fisher
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POSI‐SEAL
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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

Emerson Fisher POSI-SEAL A81 Specifications

General

Model	POSI-SEAL A81
Manufacturer	Emerson Fisher
Body Material	Carbon Steel, Stainless Steel, Alloy Steel
Type	Control Valve
Valve Type	Butterfly Valve
Seat Material	PTFE
Size Range	2 to 24 inches
Pressure Class	ASME Class 150, 300, 600
Temperature Range	-50°F to 500°F
Shutoff Class	Class VI
Material	Carbon Steel
Connection Type	Flanged

Summary

Introduction

Scope of Manual

Details installation, maintenance, and parts information for the A81 valve.

Description

Installation

Maintenance

Packing Maintenance

Procedures for maintaining valve packing to prevent leakage.

Replacing the Seal Ring Assembly

Procedure for replacing the valve seal ring assembly to stop downstream leakage.

Replacing the Disk, Shafts, or Bearings

Steps for replacing valve disk, shafts, or bearings.

Actuator Mounting

Instructions for mounting and adjusting the actuator on the valve body.

Parts Ordering

Guidance on how to order replacement parts for the valve.

Parts Kits

Information on retrofit and repair kits for ENVIRO-SEAL packing.

Parts List

List of all components with their respective part numbers.