D500194X012
Introduction
1
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Scope of Manual
1
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Description 1
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Specifications Table
2
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Installation
3
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Valve Orientation
4
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Before Installing the Valve
6
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Adjusting the Actuator Travel Stops or Travel
7
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Installing the Valve
7
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Packing Adjustment and Shaft Bonding
8
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Maintenance
9
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Removing and Replacing the Actuator
9
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Packing Maintenance
9
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Removing the Valve
10
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Seal Maintenance
11
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PTFE Seals
11
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NOVEX
R
, Phoenix
R
III and/or
Phoenix III Fire-Tested Seals
FireTested Seal Installation
12
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Anti-Blowout Design, Packing, Valve Shaft,
Disk, and Bearing Maintenance
13
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Installing the Two-Piece Shaft
14
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Gasket Retainer
15
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Parts Ordering
15
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Parts Reference
16
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Scope of Manual
This instruction manual includes installation, mainte-
nance, and parts ordering information for Size 14-
through 24-inch, POSI-SEAL
R
Model A31A High-Per-
formance Butterfly Valve (see figure 1). Refer to sep-
Figure 1. Typical Model A31A Valves
W5812-1/IL
W5811-1/IL
arate instruction manuals for information covering the
actuator and accessories.
Only personnel qualified through training or experience
should install, operate, and maintain this control valve.
If you have any questions concerning these instruc-
tions, contact your Fisher Controls sales representa-
tive or sales office before proceeding.
Description
The valve is available in either a flangeless wafer body
or a single-flange (lugged) body design, with a variety
of seals and internal components. The pressure-as-
sisted seal provides tight shutoff against the full ANSI
class pressure range for the specific type. The keyed
shaft combines with a variety of handlevers, hand
wheels, pneumatic piston or spring-and-diaphragm
actuators. Maximum inlet pressure/temperature rat-
ings are consistent with ANSI Class 150 and 300.
Instruction Manual
Form 5291
March 1998
Model A31A
