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TM 10-4930-250-13&P
Thefaceplateanddustcapof AAFARSunisexcouplingsemploya U-ringtypesealwhichis designedto seatwith pressure.
The seal is slightly higher than the groove it sits in, so that the top protrudes above the surface. Pressurized fluid enters
beneath this protrusion and expands the seal against the bottom of the seal groove and against the corresponding seal in the
dust cap or other face plate. Special care must be taken during installation to ensure the seal is fully seated in the groove. If
it is not, pressurized fluid will be forced under the seal and the coupling will leak.
COUPLING
FACE SEAL
0
DUST CAP
FACE SEAL
Figure 3-1. Face Seal and Dust Cap Seal
a. Removal.
(1)
Remove seal by hand.
b. Installation.
(1)
Wipe seal groove clean.
(2)
Press seal in groove with a smoothing motion of fingertips. Note that when fully seated, the outer lip of the
seal protrudes slightly above the surface. Ensure the seal is not twisted or kinked.
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