TM 5-4310-275-14
WARNING
2).
Dry cleaning solvent, Fed. Spec. P-D-680
or P-S-661, used to clean parts is
potentially dangerous to personnel and
Valve, Repair
property. Avoid repeated and prolonged
a. General. High pressure air in the filter and
skin contact. Do not use near open flame
separator assembly causes moisture and oil vapor
or excessive heat. Flash point of solvent
to condense and settle to the bottom of the
is 100 F. (38 C.) -- 138 F. (59 C.).
assembly. These impurities are removed by
d. Cleaning and Inspection.
opening the dump valve, allowing the air pressure
(1) Wash all metal parts in dry cleaning
to force the condensate out of the unit.
solvent, Fed. Spec. P-D-680.
b. Removal. Remove the filter and separator
(2) Dry the parts thoroughly with clean, lint-
and dump valve as a unit (fig. 4-7).
free cloths.
c. Disassembly. The filter and separator
(3) Use filtered, compressed air to blow
assembly and dump valve should be disassembled
residue from all crevices, threads and passages.
only when obvious indications of malfunction or
(4) Inspect all parts for cracks, deformation,
damage are present (see Item 4, Table 5-1).
and stripped threads.
(1) Unscrew pneumatic dump valve (items 1
e. Reassembly. Reassemble the dehydrator in
through 6, fig. 6-8) from bottom of separator shell
reverse sequence of disassembly ((fig. 6-7).
(23).
f. Testing.
(2) To disassemble pneumatic dump valve,
(1) Seal port in outlet adapter with an ap-
unscrew adapter (1) from body (9), remove
propriate pressure plug.
packing (2) from adapter. Drop piston (3) and
(2) Connect source of clean, dry compressed
spring (5) from bore of body. Remove packing (4)
air or nitrogen at a pressure of 3000 spig
from groove in piston, Remove retainer (6), seat
(210.9000 kg per sq cm) to port in inlet cap.
(7) and packing (8).
(3) Slowly pressurize dehydrator housing to
(3) Unwrap tape and remove heater blanket
a maximum pressure of 3000 psig (210.9000 kg
(10) from around separator shell (23).
per sq cm).
(4) Remove pipe plug (13, fig. 6-8) from tank
(4) Brush a soap-water solution on all joints
cap (17). Unscrew disc ring retainers (14) and
and seams of dehydrator housing. Check for air
remove disc rings (15) and rupture discs (16) from
leaks as evidenced by air bubbles. Maximum
ports in cap.
allowable leakage is two cubic centimeters per
(5) Unscrew tank cap (17) from separator
hour.
shell (23 ). Slip gasket (18) from groove in cap.
(5) After completing leakage test, wipe all
(6) Remove screw and plug assembly (22)
soap- water solution from surface of dehydrator
and washer (21 ) and lift filter element (20) and
housing. Relieve air pressure, disconnect test
gasket (19) from cap (17).
equipment and remove pressure plug from outlet
(7) Do not remove thermostat switch (11)
adapter.
from recess in shell (23) unless a new switch is
(6) Remove outlet adapter cap and install
required. Switch is pressed into shell and will be
dehydrator cartridge.
unusable if removed.
