ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
REVERSE OSMOSIS SYSTEM
Reject Backflow Check Valve V-411 Replacement:
Parts (TM 10-4610-309-24P):
Reject Backflow Check Valve V-411
1-1/2 in. Grooved Coupling Gasket
Equipment Condition:
TWPS in Standby Shutdown Without Draining Down
Army: TWPS main breaker off
Marine Corps: TWPS disconnected from power source
Replace Reject Backflow Check Valve V-411 as follows (see Figure 16):
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
removing or installing Reject Backflow Check Valve V-411. Failure to observe this
warning can result in injury or damage to equipment.
1. Remove the grooved couplings from both ends of Reject Backflow Check Valve V-411. Slide the
gaskets back over the pipe ends.
2. Remove Reject Backflow Check Valve V-411.
3. Inspect the 1-1/2 in. diameter grooved coupling gaskets for damage or deterioration and replace if
needed.
4. Position the new Reject Backflow Check Valve V-411 in the reject line so that the arrow on the
side of the valve points downstream (to the right) and the hinge post is vertical.
5. Secure the ends of the Reject Backflow Check Valve V-411 to the reject line using the two
grooved couplings.
GASKET
HINGE POST
GROOVED COUPLING
CHECK VALVE V-411
Figure 16. Reject Backflow Check Valve V-411 Replacement.
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