ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
FEED FLOW CONTROL PANEL
Pressure Regulating Valve PRV-904 Replacement:
Parts:
Pressure Regulating Valve PRV-904 (TM 10-4610-309-24P)
Material:
Antiseizing tape (WP 0079, Table 1, item 30, 31)
Equipment Condition:
TWPS in Standby Shutdown Without Draining Down
Army TWPS: Generator off and TWPS main breaker off
Marine Corps TWPS: TWPS disconnected from power source
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-904 as follows:
1. Remove Pressure Regulating Valve PRV-904 from the feed flow control panel assembly as
follows (see Figure 3):
a. Bleed the air system. Refer to AIR SYSTEM BLEED DOWN PROCEDURES.
b. Disconnect the upper and lower tubes from the regulating valve.
c. Unscrew the lock nut that holds the adjusting knob in place; remove and retain the knob.
d. Remove the two bolts, lock washers, and flat washers that hold the pressure-regulating
valve to the panel assembly and remove the pressure-regulating valve.
e. Remove the two tubing adapters from the regulating valve and clean the threads.
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