D500240X012
Posi-Seal
R
Type A31A High Performance
Butterfly Valve 3 through 12-Inch
Contents
Introduction
1
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Scope of Manual
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Specifications
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Description
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjusting the Actuator Travel Stops or Travel
3
. . . .
Valve Orientation
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preparing for Installation
4
. . . . . . . . . . . . . . . . . . . . . .
Installing Wafer-Style Valves
7
. . . . . . . . . . . . . . . . . . .
Installing Single-Flange Valves
8
. . . . . . . . . . . . . . . . .
Maintenance
9
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Replacing Packing
9
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Removing the Valve from the Pipeline
10
. . . . . . . . .
Removing/Installing the Seal Ring
11
. . . . . . . . . . . .
PTFE Seal Installation
11
. . . . . . . . . . . . . . . . . . . . .
NOVEX Seal and Phoenix III
Fire-Tested Seal Installation
12
. . . . . . . . . . . . . . . .
Cryogenic Seal Installation
13
. . . . . . . . . . . . . . . . .
Anti-Blowout Protection, Packing,
Valve Shaft(s), Disk, and Bearing
Maintenance
14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal
14
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Installing a One-Piece Shaft
16
. . . . . . . . . . . . . . . .
Installing a Two-Piece Shaft
16
. . . . . . . . . . . . . . . .
Installing the Gasket Retainer
17
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Parts Ordering
18
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Parts Reference
18
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Introduction
Scope of Manual
This instruction manual provides installation, mainte-
nance, and parts ordering information for the
POSI-SEAL Type A31A high-performance butterfly
Figure 1. Typical Type A31A Valve
W5812-1/IL
W5811-1/IL
valves. Figure 1 shows typical Type A31A valves. For
information regarding actuators and accessories, refer
to separate instruction manuals.
Only personnel qualified through training or experience
should install, operate, and maintain this valve. If you
have any questions concerning these instructions,
contact your Fisher Controls sales representative or
sales office before proceeding.
Description
The Type A31A high-performance butterfly valve fea-
tures a keyed drive shaft. The keyed shaft combines
with a variety of handlevers, handwheels, pneumatic
piston or spring-and-diaphragm actuators to make the
Type A31A a reliable, high-performance, butterfly
valve for a variety of applications in the various pro-
cess industries.
Instruction Manual
Form 5456
November 1998
Type A31A
