ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
0055 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
AIR SYSTEM, REDUCED PRESSURE
WARNING
The TWPS must be in Shutdown and the TQG and TWPS main breaker must be off
(Army) or the TWPS disconnected from its power source (Marine Corps) prior to
performing maintenance on the TWPS Air System. Failure to observe this warning
can result in injury to personnel and damage to equipment.
High pressure. The air system contains air pressure up to 1800 psig. The air
system must be bled prior to performing maintenance on components of the air
system. Failure to observe this warning can result in injury to personnel and
damage to equipment.
Replace Pressure Regulating Valve PRV-902 as follows:
1. Make sure the air system has been bled down. Refer to ENTIRE AIR SYSTEM BLEED DOWN.
2. Remove the Air System Section 3 assembly from the TWPS. Refer to REPLACE and Air
System Section 3 Assembly.
3. Remove Pressure-Regulating Valve PRV-902 from the Air System Section 3 assembly as follows
(see Figure 4):
a. Disconnect the pressure regulating valve from the assembly at the pipe union.
b. Disconnect the pressure regulating valve from the cross tee connection.
3/4" CLOSE NIPPLE
PRESSURE GAUGE PI-903
REDUCER BUSHING
CROSS TEE CONNECTION
1/2" CLOSE NIPPLE
PRESSURE REGULATING VALVE PRV-902
PIPE UNION HALF
Figure 4. Pressure Regulating Valve PRV-902.
4. Place the old pressure regulating valve on a clean workbench and perform the following:
a. Remove the 1/2-in. close nipple, the reducer bushing and pipe union half and 3/4-in. close
nipple from the ends of PRV-902.
b. Clean all parts.
055 00-7
