TM 9-2590-506-13&P
5-19. INTERNAL
VALVE
MAINTENANCE
INSTRUCTIONS (Continued)
g. Testing.
(1) Aline 1/4-inch index pin with 1/4inch hole
in internal valve and install test fixture
internal valve and secure with four
MS16995-8L socket head screws.
(2) Install 1/4-inch NPT pipe plug in pilot
assembly port and apply 60 psig air
pressure to inlet port of test fixture.
(3) Submerge unit in dry cleaning solvent
(4) Measure leakage using an inverted funnel
positioned as follows:
Measure
Maximum Allowable Leakage/
Leakage At
Time Allowed for Leakage
Shaft Seal
4 cc/15 seconds
Valve Piston
Assembly Seal
4 cc/15 seconds
Valve Cap/Valve
Body Seal
4 cc/15 seconds
Tubes
4 cc/15 seconds
h. Installation.
(1) Install male elbows (9) in internal valve
(5).
5-39