TM 9-4120-378-14
5.17 EXPANSION VALVES. - continued
Remarks
Action
Location/Item
Quench
Expansion
Valve
Rernoval
a.
Soften mastic bulb in well if necessary, by warming
with a cloth soaked in hot water.
Withdraw the bulb (4) from the well. Take care to
b.
prevent damage to the capillary tube.
c.
Remove two screws (5), two spacers (6), two self
locking nuts (7), and two valve mounting brackets
(8).
See paragraphs 5.5 and 5.6.
d.
Debraze tubing from valve (9) at debrazing points.
e.
Remove quench valve (9).
Primary
Expansion
Valve
With dry nitrogen flowing through refrigeration sys-
Installation
a.
tem, braze valve to tubing.
Take care to avoid kinking capillary
tube.
b.
Coil excess tubing.
c.
Insert approximately 1.0 ounce (28.349 gins) of
thermal mastic bulb in well (1).
d.
Press sensing bulb (2) into well (1) and work back
and forth to distribute mastic thoroughly and until
capillary end is approximately 1.0 inch (2.54 cm)
beyond open end of well.
See paragraph 5.25.
Replace dehydrator.
e.
See paragraph 5.7.
f.
Leak test refrigeration system.
See paragraph 5.8.
Evacuate refrigeration system.
g.
See paragraph 5.9.
h.
Charge refrigeration system.
See paragraph 4.17.
i.
Install front and center top covers.
5-55
