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Dover Midland A-720 Series - User Manual
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Installation, Operation & Maintenance Manual
Part No.
: A-720/A-721/A-721-B/A-724, Rev
. 1.8
Issue Date:
Jan 3, 2022
Supersedes:
A-720/A-721/A-721-B/A-724, Rev
. 1.7
T
op-T
r
ansfer 2
"
Angle
V
alve
A-720,
A-721
and A-724
Series
Installation,
Operation
& Maintenance Manual
www
.midland.com
2
Table of Contents
Main Page
Table of Contents
2
Section 1 | Regulations and Safety Requirements
3
Regulations
3
Safety Warnings and Precautions
3
Section 2 | Introduction
4
Component Identification and Parts Listings
4
Section 3 | Valve Installation
8
Installation and Required Tools
8
Section 4 | Operating Procedure
10
Opening the Valve
10
Section 5 | Valve Qualification
11
Section 6 | Valve Disassembly
15
Section 7 | Valve Reassembly and Testing Procedures
19
Cleaning
19
Reassembly Procedure
19
Testing Procedure
25
Post-Test Procedures
25
Section 8 | Maintenance
26
Prior to Maintenance Tasks Performed
26
Leak Repair on a Mounted Valve
26
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Dover Midland A-720 Series Specifications
General
Brand
Dover
Model
Midland A-720 Series
Category
Control Unit
Language
English
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