Page 14 of 28
Manual content is subject to change.
Visit midlandmfg.com for latest IOM revision and revision history.
Leak Inspection
Test all newly installed valves to conform to car-owner specifications. No leaks should be present.
WARNING:
Valve Leakage.
Improper flange-tongue seating in the valve groove, loose bolts and damaged
gaskets may result in leaks at the valve-mounting joint.
Inspect for leaks. Follow your company’s leak-testing procedure.
Valve Operation Notes and Precautions
NOTICE: Valve Operation.
Operation and use of the valve must conform with all applicable TC, AAR, DOT
(Parts 173.31, 174.68, etc.) regulations, other governmental bodies and the operating instructions of your
company.
Rotate shaft to operate valve open and close.
Ensure the valve is fully open, and close by the indicator fully engaging the pin stops.
A-520/A-522/A-522A
, Rev. 3.0
