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A-520 Series
Midland A-520 Series User Manual
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A-520/A-522/A-522A
, Rev. 3.0
Issue Date:
A
pril
01
,
2021
Supersedes:
A
-5
20/522,
R
ev.
2
.
2
Manual content is subject to ch
ange.
Visit
www.midlandmfg.c
om
for latest manual revision and revi
sion history.
A-520/A-522/A-522A Series
4" Bottom Outlet Ball Valve
Installation,
O
peratio
n
&
M
aint
enance
(IOM)
Manual
2
Table of Contents
Default Chapter
2
Table of Contents
2
1 Regulations and Safety Requirements
3
Regulations
3
Safety Warnings and Precautions
3
2 Introduction
4
Component Identification and Parts Listings
4
Steam-Jacket Configurations
10
3 Valve Installation
12
Installation Procedure and Required Tools
12
Leak Inspection
14
Valve Operation Notes and Precautions
14
4 Valve Qualification
15
Valve Disassembly and Required Tools
15
Component Inspection
18
Special Inspection Considerations
19
Valve Assembly and Testing Requirements
20
Valve Assembly and Testing Procedure
20
5 Routine Maintenance
27
Leak Checking in the Field
27
5
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Midland A-520 Series Specifications
General
Brand
Midland
Model
A-520 Series
Category
Control Unit
Language
English
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