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
CAUTION
Be sure the return tubing is connected to the four-function valve and runs back to
the chemical solution bucket.
The RO tank must be drained prior to removing Injection Check Valve V-623.
Failure to observe this caution could result in filtrate spilling out of the RO tank
onto the unit and working area.
1. Depressurize the chemical injection pump discharge tubing as described in the Chemical
Injection Pump Replacement procedure earlier in this WP.
2. When replacing Antiscalant Injection Check Valve V-623, open RO Feed Tank Main Drain Valve
V-412 and drain the RO tank (see Figure 5 for valve V-412 location).
3. When replacing Calcium Hypochlorite Injection Check Valve V-633, open Product Utility Valve V-
511 and drain the product line (see Figure 5 for valve V-511 location).
4. Remove the old injection check valve assembly as follows (see Figure 6):
a. Unscrew the coupling nut from the injection check valve housing and disconnect the
discharge tubing from the injection check valve housing.
b. Remove and discard the clamp ring and coupling nut from the discharge tubing.
c. Place a bucket or suitable container under the injection check valve assembly.
d. Unscrew the injection check valve body from the process pipe.
e. Discard the injection check valve assembly including the coupling nut, clamp ring, valve
housing, flat washer injection seat, check valve ball, spring, O-ring, injection check valve
body and flapper valve.
INJECTION CHECK
PROCESS PIPE
VALVE BODY
VALVE HOUSING
COUPLING NUT
INJECTION SEAT
SPRING
CHECK
FLAPPER VALVE
DISCHARGE TUBE
FLAT WASHER
O-RING
VALVE BALL
CLAMP RING
Figure 6. Injection Check Valve Assembly Replacement.
CAUTION
Do not use pliers or pipe wrench on coupling nuts or fittings.
5. Install the new injection check valve assembly as follows (see Figure 6):
a. Apply antiseize tape only to the pipe threads of the injection check valve body that
threads into the process pipe.
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