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
3. Install the new foot valve assembly as follows (see Figure 7):
a. Make sure that the ceramic weight is inserted over the suction tubing.
b. Slide the new coupling nut onto the suction tubing so that the nut threads are facing
toward the end of the tubing.
c. Install the clamp ring about 1/4 inch onto the end of the tubing.
d. Insert the end of the suction tube over the cone-shaped end of the valve housing.
e. Thread the coupling nut onto the foot valve housing and tighten hand-tight.
f. Place the new foot valve in the chemical solution bucket.
g. Make sure that the suction tubing is completely vertical and two inches from the bottom of
the chemical solution bucket.
4. Start up the TWPS from Standby Shutdown and prime the pump as described in the Chemical
Injection Pump Replacement procedure earlier in this WP.
5. Operate the chemical injection pump and check for leaks.
REPAIR
Chemical Injection Pump Repair / Four-Function Valve (V-612, V-622 and V-632):
Parts (TM 10-4610-309-24P):
Four-function valve
Material:
Antiseizing tape (WP 0079, Table 1, item 30, 31)
Five gallon bucket
Equipment Condition:
TWPS electric power "ON"
Replace the four-function valve on a chemical injection pump as follows:
1. Remove the chemical injection pump four-function valve as follows (see Figure 8):
a. Depressurize the chemical injection pump discharge tubing as described in the Chemical
Injection Pump Replacement procedure earlier in this WP.
b. Remove the foot valve from the chemical solution bucket and place it in the empty five-
gallon bucket to drain the suction line.
c. Remove the return tubing from the side of the four-function valve.
d. Remove the discharge tubing from the top of the four-function valve.
e. Remove the old four-function valve from the top of the pump head.
f. Remove the clamp ring and coupling nut from the discharge tubing.
g. Retain the flat washer (clear washer inside the bottom of the four-function valve), the
discharge cartridge valve, and the O-ring.
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