TM 5-4310-275-14
(2) Adjust pressure regulator to apply an air
pressure of 3000 psig (210.9000 kg per sq cm) to
a. General. The back pressure valves are in-
outlet of check valve. Leakage, as indicated by air
stalled in the discharge outlet of the separator and
bubbles escaping from submerged leakage tube,
between the air line filter and the air pressure
shall not exceed three cubic centimeters per hour.
tank to maintain steady air pressure within the
(3) With check valve connected, reduce
pneumatic system.
applied air pressure to 5 psig (0.3515 kg per sq
b. Removal. Remove the back pressure valve
cm). Leakage shall not exceed three cubic cen-
timeters per minute.
c.Disassembly.
(4) Reverse test connections to check valve
(1) Remove inlet and outlet fittings (3 and 4,
so free flow arrow points away from air supply.
(5) Slowly open pressure regulator until air
body (13).
flow through check valve exceeds three cubic
(2) Unscrew valve cap (6) from top of valve
centimeters per minute. This shall occur when
body (13). Remove spring plates (7) and spring (8)
applied pressure is from 2 to 8 psig (0. 1406 to
from inside valve body.
0.5624 kg per sq cm).
(3) Remove piston (9) and piston seat (10)
g. Installation. Install the check valve.
from inside valve body (13). Remove O-ring
packings (11 ) and backup ring (12) from piston
and valve seat.
