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4 Valve Qualification
Follow these instructions and guidelines for assessing the condition of a leaking ball valve prior to rebuilding it.
NOTICE: To ensure best practices and consistency of your qualification procedure, gaskets, O-rings, valve
seats and wire seals should always be replaced.
Valve Disassembly and Required Tools
SAE Wrench
1-5/8" Wrench
5/8" Allen Wrench
Other Tools, Supplies, and Equipment:
Thread Go/No-Go Gauge
Figure 4-1 Required Tools for Valve Disassembly
Set the valve to the closed position. This must be done to allow removal of
the valve ball.
Locate the valve on a bench (preferably on a pressure-test fixture) so it may
be bolted for safety and rigidity during hardware removal. Secure it with the
eight-bolt flange.
Remove the outlet cap assembly (if present).
Visit midlandmfg.com for latest IOM revision and revision history.
Component(s)/Description
Locknut (item 13)
Cap Screws (item 9)
Stem (item 2)
Manual content is subject to change.
Figure 4-2 Set to Closed Position
Secure Eight-Bolt Flange
Figure 4-3 Valve Inverted
A-520/A-522/A-522A, Rev. 3.0
Page 15 of 28
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