proximately 6 inches in diameter. The pres-
(2) above. The third adapter is used
sure gage is vented by the bleeder valve.
with the quick-disconnect coupling
half to connect the 6-foot long valve
d. Additional Fittings Required To Complete
and hose assembly to the M9 tank
the M5 Test Set.
group high pressure sphere assembly.
(1) Preformed packings. Preformed pack-
(6) Plug assembly. One high pressure
ings made of synthetic rubber are used
plug assembly (8) replaces the check
to make leakproof seals between two
valve safety disk plug assembly when
m a t i n g surfaces.
O n e preformed
performing volumetric pressure tests
packing ((5), fig. 3) is used with the
on the M9 tank group high pressure
t e s t i n g gage adapter described in
sphere assembly.
p a r a g r a p h (2) (a) below. Another
preformed packing (6) is used with
(7) Tube reducer. One tube reducer (9)
another testing gage adapter and a
contains threads on both ends. One
filling plug assembly described in
end c o n t a i n s 7 / l 6 - 2 0 U N F - 3 A
p a r a g r a p h s (2) (b) and (3) below.
threads and screws into the high pres-
Additional preformed packings are
sure air hose. The other end contains
used with the pump assembly (para
-13 UNC-2A threads and screws
into the 6-foot rubber hose assembly
valve when testing the M9 high pres-
(2) Testing gage adapters. T WO testing
sure sphere assembly with the air
gage adapters are used during testing
hose attached.
the flame thrower fuel tanks.
(8) Check valve body. One check valve
(a) One testing gage adapter (1) is
b o d y (10) is threaded with -13
about 2 inches in diameter and is
UNC-2A threads on one end and -
used to test the fuel tank of the M9
20 UNF-2A threads on the other end.
tank group and associated hose and
The check valve body does not have a
gun group.
check valve (ball and spring) and re-
(b) The remaining testing gage adap-
places the check valve on the M2A1
ter (2) is about 1 inches in diam-
pressure tank during testing.
eter and is used to test the fuel tank
(9) Diffussion pipe plugs. Two diffusion
of the M2A1 tank group and asso-
pipe plugs (11) and (14) are used to
ciated hose and gun group.
seal off the open end of the diffusion
(3) Filling plug assembly. The filling plug
pipes on the M2A1 tank group and the
assembly (8) is used to plug the open-
M9 tank group respectively. Each of
ing in the top of the M3 agent tank
these plugs is metal stamped for posi-
after the pipe-and-cap assembly has
tive identification.
been removed.
(10) Coupling half quick disconnect. O n e
(4) Tank adapter. One tank adapter (4)
coupling half quick-disconnect (12) is
replaces the filling plug in the 1-
used with the M9-7 high pressure
gallon tank. A length of rubber
suphere. One end has a -18 NPT
tubing ((4), fig. 1) is positioned on a
threaded female connection for re-
tube assembly and connects onto the
ceiving one straight pipe-to-tube adap-
open end of the tank adapter.
ter. The other end is fitted with the
(5) Straight pipe-to-tube adapters. Three
quick-disconnect onto the high-pres-
straight pipe-to-tube adapters ((7),
sure sphere assembly.
fig. 3) have both ends threaded One
end has -13 UNC-2A threads and
(11) Plug (rubber hose). A plug (13) is
t h e opposite end has -18 NPT
used to plug the end of the 6-foot long
t h r e a d s . Two straight pipe-to-tube
rubber hose assembly valve when de-
adapters screw into the openings in
termining the temporary expansion of
the testing gage adapters described in
the rubber hose.
AGO 8359A
7
