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5 Routine Maintenance
Leak Checking in the Field
Because of the ball valve's simplicity, the only maintenance procedure consists of checking the valve for leaks. If the
valve is leaking from its outlet port, rebuild or replace it. If minor leakage is detected only at the valve-stem packing,
remove the handle and increase the tightening torque on the locknut (item 13). If this fails to stop the leak, rebuild or
replace the ball valve.
WARNING: Do not exceed 150 ft-lbs of torque when tightening the locknut (item 13).
TIP: Use a 1-5/8" wrench to tighten the locknut (item 13).
Manual content is subject to change.
Visit midlandmfg.com for latest IOM revision and revision history.
A-520/A-522/A-522A, Rev. 3.0
Page 27 of 28
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