TM 55-1520-240-23-6
7-258
TEST PRESSURE REDUCING VALVE (AVIM)
(Continued)
7-258
PRESSURE SETTING TEST
8.
Connect hoses (5, 6, and 7) to INLET port (1),
OUTLET port (3), and RETURN port (4) of valve
(2).
9.
Close shutoff valves (8, 9, and 10).
10.
Apply 100 psi pressure to RETURN port (4).
11.
Open shutoff valve (10) and apply 3,000 psi
pressure to INLET port (1).
12.
Adjust shutoff valve (11) for flow 20 cc per
minute from OUTLET port (3).
13.
Check pressure gage (12). Pressure shall be
1450 psi. If reading is not 1450 psi, adjust end
cap (13) to obtain reading.
14.
Close shutoff valve (11).
PRESSURE REDUCING AND FLOW TEST
15.
Adjust valve (9) for flow of 3.5 gpm on flowmeter
(14).
16.
Check pressure gage (12). Pressure gage shall
read 1230 psi or more. If pressure reading is not
1230 psi or more, adjust end cap (13) to obtain
reading.
17.
If end cap (13) is adjusted, repeat steps 9 thru
14. All pressure readings must be obtained at
one setting of end cap.
18.
Reduce pressure at return port (4) to 0 psi.
19.
Close valve (10) to reduce pressure at INLET
port (1) to 0 psi.
RELIEF CRACKING PRESSURE TEST
20.
Close shutoff valves (9 and 11).
21.
Open shutoff valve (8) slowly. Apply pressure to
outlet port (3) until cracking flow (rise in pressure)
at gage (15) is observed.
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