ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
0042 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
OPERATOR MAINTENANCE PROCEDURES
AIR SYSTEM
Pressure Regulating Valve PRV-901 and PRV-902 Adjustment:
Equipment Condition:
TWPS operating
Adjust Pressure Regulating Valve PRV-901 or PRV-902 as follows (see Figure 6):
WARNING
Moving parts. The compressor may operate during this procedure. Keep hands,
loose clothing and other loose personal effects away from the compressor fan and
fan belt. Failure to observe this warning may result in serious injury.
1. Unscrew and remove the plastic adjusting screw cap from the valve body.
2. Loosen the lock nut.
NOTE
Turning the adjusting screw clockwise increases the regulated pressure. Turning
the screw counter-clockwise reduces the regulated pressure.
3. To adjust the regulated pressure at PRV-901, crack low pressure vent valve V-910 open just
enough to provide a minimal air flow, observe Pressure Gauge PI-902 and turn the pressure
adjusting screw in the desired direction to obtain a reading of 100 psig. Then close valve V-910.
4. To adjust the regulated pressure at PRV-902, crack low pressure vent valve V-915 open just
enough to provide a minimal air flow, observe Pressure Gauge PI-903, and turn the pressure
adjusting screw in the desired direction to obtain a reading of 15 psig. Then close valve V-915.
5. Hold the pressure adjusting screw in place and tighten the lock nut.
6. Reinstall the cap on the body of the pressure regulating valve.
PRESSURE REGULATING VALVE PRV-902
PRESSURE GAUGE PI-903
LOW PRESSURE
LOCK NUT
VENT VALVE V-915
PRESSURE
REGULATING
VALVE PRV-901
SCREW CAP
PRESSURE ADJUSTING SCREW
LOW PRESSURE VENT VALVE V-910
PRESSURE GAUGE PI-902
Figure 6. Pressure Regulating Valve PRV-901 or PRV-902 Adjustment.
0042 00-8
