TM 9-2330-294-14
(2) Close vent valve. Install pipe plug in
exhaust port. No leakage is permissible. Again check
exhaust port of auxiliary air supply valve.
for leakage at valve handle stem; leakage should not
exceed 1-inch diameter bubble in 3 seconds.
(39 Turn auxiliary air supply valve handle to
"off" position (parallel to .valve body). Open hand
(7) Turn auxiliary air supply valve to "off"
position. Pressure at control port shall read 0 psi.
control valve and adjust pressure regulator testing
(8) Repeat (4) above.
valve until supply pressure gage reads 100 psi.
(4) Using suitable solutions, check for air
(9) Close hand control valve. Open vent valve
leakage at exhaust port. Air leakage shall not exceed
and reduce supply pressure to 0 psi. Remove
auxiliary air supply valve from testing device.
a 1-inch diameter bubble in 3 seconds.
h. Low-pressure Warning Switch (MS27152-1)
(5) Using a suitable solution, check for air
leakage at handle stem. No leakage permissible.
(1) Using suitable air lines, fitting and electrical
(6) Turn auxiliary air supply valve handle to
wiring, connect the low-pressure warning switch to a
"on" position (right angles to valve body). Pressure
at control port shall equal supply pressure. Using a
suitable solution check for air Ieakage at the
Figure E-5. Bench testing the low-pressure warning swItch.
(8) Slowly decrease inlet pressure until am-
(2) Close vent valve.
meter reads 1 ampere. Pressure at inlet port shall
equal 606 psi at the point where the ammeter
(4) Close switch S-1 and adjust power supply
jumps from 0- to 1-ampere reading.
for 24 vdc.
(9) Open switch S-1 and reduce inlet pressure to
(5) Adjust pot R1 until ammeter reads 5 am-
peres. Voltmeter No. 2 shall not exceed a reading
0 psi. Remove low-pressure warning switch from
greater than 150 millivolts.
testing device.
(6) Adjust pot R1 until ammeter reads I am-
pere.
(1) Using suitable air lines and fittings, connect
the manual shutoff valve assembly to a testing
(7) Open hand valve and adjust pressure
regulaor valve for an inlet pressure of 75 psi.
Ammeter reading drops to 0 ampere.
pressure gage.
E-5