TM 1-4220-250-12&P
4.8.3 Replace LRU-18/U Oral Inflation Valves.
This task covers:
a. Replace
INITIAL SET UP
Material/Parts
Tools/Equipment
Tester, Spring
Oral Inflation Valve
Disposable Brush
(D2)
Adhesive
(D1)
Cotton Swabs
(D26)
Isopropyl Alcohol
(D12)
Scale
1.
Replacement of Oral Inflation Valve. To replace the oral inflation valve, proceed as follows:
NOTE
Replacement oral inflation valves can be obtained only through salvage of non-
repairable inflatable survival equipment.
a.
Carefully cut through metal clamp, securing oral inflation valve to oral inflation tube and removing the metal
band and oral inflation valve.
b.
If the oral inflation tube was damaged during removal of valve, trim off damaged section.
c.
Clean both surfaces to be cemented with alcohol (D12) and cotton swabs (D26). Allow areas to dry.
d.
Using a small disposable brush (D2), carefully apply a small amount of adhesive (D1) to the surfaces of the
tube and the valve, which are to be cemented together.
e.
Immediately place oral inflation valve into oral inflation tube. Oral inflation valve should be inserted up to
valve shoulder. Inspect for proper application/cement.
f.
Tightly wrap the cemented portion of the oral inflation tube with cord or wire and allow to cure for 24 hours.
After cure period remove cord or wire.
g.
(Oral tube without brass clamp) Apply a 40 to 50 inch lb. pull to oral valve to ensure security of attachment
h.
Wrap wire around oral valve assembly. Attach scale to other end of wire and obtain a 40-50 inch lb. pull.
Ensure during test that the oral tube is held to prevent tube from separating from raft.
i.
Inspect for separation of oral valve from tubing.
j.
Perform life raft leakage test in accordance with paragraph 4.7.2.
END OF TASK
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