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 TM 5-4120-393-14
5-20. Expansion Valve (Liquid Quench) (cont)
REMOVAL
1.
Discharge the refrigerant system. See para 5-9.
2.
Unwrap insulation from suction line so that sensing bulb (2) is ex posed. Loosen screw and nut in clamp. Pull bulb out
of clamp.
3.
Using a wrench, remove the two screws (3), flat washers (5), lock washers (4), and spacers (6) that attach the flange
body (11) to its mounting bracket.
4.
Remove remaining valve comp onents (8,9,10) except for body flange (11).
NOTE
If valve body flange (11) is not damaged, do not remove (debraze) it from the
system.
5.
If valve body flange (11) is to be removed, purge the system with nitrogen and debraze the two tubes. See para 5-10
and 5-11.
INSTALLATION
1.
If valve body flange (11) was removed, purge the system with nitrogen and braze the two tubing joints. See para 5-10
and 5-11.
2.
Place screws (3), lock washers (4), flat washers (5), and spacers (6) through bracket and valve body flange (11).
3.
Be sure that valve components (8, 9, and 10) are properly assembled and aligned, and secure power assembly (7) to
body flange (11).
4.
Place the sensing bulb (2) in its original position. Be sure the sensing bulb is mak ing good metal to metal contact with
the suction line.
5.
Reinstall and tape in place tubing insulation that was removed from suction line tubing. If it was damaged, replace
with tubing insulation item 17, Appendix E.
6.
Replace the dehydrator. See para 5-16.
7.
Leak test all newly connected joints and those in the repair area. See para 5-12.
8.
NOTE
FOLLOW ON MAINTENANCE:
1. Install junction box number two. See para 4-46.
2. Install lower front panel. See para 4-24.
3. Connect power.
5-49
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