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TM 9-4120-389-14
5-23. LOW PRESSURE SERVICE VALVE
Preliminary procedure: Remove top cover (See para. 4-14).
a.
Inspection
(1)
Check that cap is in place and that threaded connection is not damaged. Replace cap if
missing or damaged.
(2)
Check for signs of leakage. Leak test per para. 5-6, if leak is suspected.
b.
Repair. The most logical cause of failure to service valve will be due to loose or damaged valve
stem. If leak is indicated, proceed as follows:
(1)
Tighten valve stem.
(2)
Leak check per para. 5-6.
(3)
If leak persists, discharge the system per para. 5-3.
(4)
Remove valve stem.
(5)
Install replacement stem.
(6)
Leak check the valve stem/body area per para. 5-6.
(7)
If leak persists, replace valve assembly.
Figure 5-20. Low Pressure Service Valve
5-61
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