ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
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TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
CHEMICAL INJECTION SYSTEM
COUPLING NUT
DISCHARGE TUBING
CLAMP RING
FOUR-FUNCTION
VALVE
PUMP HEAD
RETURN TUBING
FLAT WASHER
DISCHARGE CARTRIDGE VALVE
O-RING
Figure 8. Chemical Injection Pump Four-Function Valve Replacement.
2. Install the new four-function valve as follows (see Figure 8):
a. Insert the o-ring all the way down into the opening at the top of the pump head.
b. Set the discharge cartridge valve into the opening at the top of the pump head with the
flat end of the cartridge up.
c. Insert the flat washer into the bottom of the new four-function valve.
d. Apply anti-seize tape to the bottom threads only of the four-function valve.
e. Screw in the new four-function valve until it contacts the O-ring.
f. Add an additional 1/8 1/4 turn to prevent leaks.
g. Slide the new coupling nut over the discharge tube so that the nut threads are facing
toward the new four-function valve.
h. Install the clamp ring about inch onto the end of the tubing.
i. Thread the coupling nut onto the four-function valve and tighten hand-tight.
NOTE
To ensure priming, the return tubing must not be submerged in the solution.
j.
Connect the return tubing to the side of the new four-function valve.
k.
Place the foot valve back into the chemical solution bucket.
l.
Make sure that the suction tubing is completely vertical and two inches from the bottom of
chemical solution bucket.
m. Start up the TWPS from Standby Shutdown and prime the pump as described in the
Chemical Injection Pump Replacement procedure earlier in this WP.
n. Operate the pump and check for leaks.
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