TM 5-4310-275-14
(4) Position tube fitting gaskets (5) in
ends closed, square and ground. Length of spring
grooves of inlet and outlet fittings (3 and 4).
with a load of 86 pounds (11.8938 kgm) plus or
Screw fittings into appropriate ports of valve
minus 10 pounds (1.3830 kgm) should be 0.687
body (13) and tighten to a torque of 45 pound-
inch (1.74498 cm).
inches (.5394 kgm).
( 5 ) Discard all damaged, worn and
(5) Place spring (8), flanked by two spring
questionable parts.
plates (7), into valve body (13). Screw valve cap
e. Reassembly.
(6) into valve body until top surface of cap is
(1) During reassembly, apply a light film of
approximately flush with upper edge of valve
pneumatic system grease, Specification MIL-G-
body.
4343, to all gaskets, packings and male threads.
f.
Test and Adjustment.
(2) Install backup ring (12, fig. 6-5) and
(1) Install the back pressure valve into the
packing (11 ) in groove of piston (9), Install second
test setup illustrated in Figure 6-6.
packing (11) in groove of piston seat (10).
(3) Install piston seat (10) and piston (9) in
valve body (13).
TS014394
pressure as specified the inlet pressure shall not
(2) Open the shut-off valve fully. Open the
exceed 2450 psig (172.2350 kg per sq cm) as in-
pressure regulator to gradually increase inlet
dicated at gage No. 1.
pressure until the flowmeter indicates a flow of
(4) Fully open the shut-off valve. Starting
2.0 scfm, to test for full flow pressure. With the
the
pressure,
open
zero
with
inlet
flow as specified, the inlet pressure, gage No. 1,
pressure regulator to gradually increase inlet
shall be 2550 to 2700 psig (182.7800 to 193.3250
pressure to 2000 psig (154.6600 kg per sq cm).
kg per sq cm).
With the inlet pressure as specified leakage
(3) To test for full flow with back pressure,
through the back pressure valve shall not exceed
adjust the pressure regulator and the shut-off
5.0 cc/min., as indicated by the flowmeter.
valve until the outlet pressure, gage No. 2, is 2400
(5) With the shut-off valve fully open, adjust
psig (168.7200 kg per sq cm) and the flowmeter
the pressure regulator for inlet pressure of 2750
indicates a flow of 2.0 scfm. With the outlet
