ARMY TM 10-4610-309-14
MARINE CORPS TM 10802A-14/1
0055 00
TACTICAL WATER PURIFICATION SYSTEM (TWPS)
UNIT MAINTENANCE PROCEDURES
AIR SYSTEM, REDUCED PRESSURE
Replace Solenoid Valve XV-903 as follows:
1. Make sure the air system has been bled down. Refer to ENTIRE AIR SYSTEM BLEED DOWN.
2. Remove the Air System Section 3 assembly from the TWPS. Refer to REPLACE and Air
System Section 3 Assembly.
3. Remove Solenoid Valve XV-903 from the Air System Section 3 assembly as follows (see Figure
6):
a. Disconnect the reducer bushing on Solenoid Valve XV-903 from the cross tee.
b. Disconnect the reducer bushing, the two 3/8-in. close nipples, and the 3/8-in., 90-degree
elbow from Solenoid Valve XV-903.
1/2" TO 3/8" REDUCER BUSHING
3/8" CLOSE NIPPLE
SOLENOID VALVE XV-903
3/8" CLOSE NIPPLE
3/8" 90-DEGREE ELBOW
Figure 6. Solenoid Valve XV-903.
4. Place old Solenoid Valve XV-903 on a clean workbench and perform the following:
a. Clean all disassembled parts.
b. Apply antiseizing tape to both ends of the two close nipples and the external threads of
the reducer bushing.
5. Install the new Solenoid Valve XV-903 in the Air System Section 3 assembly as follows:
a. Thread the two 3/8" close nipples onto the solenoid valve hand tight.
b. Thread the 1/2" to 3/8" reducer bushing into the cross tee and tighten.
c. Thread the close nipple on the input side of the valve into the reducer bushing but do not
over-tighten. Refer to Figure 6 for correct positioning of the valve.
d. Thread the 3/8" elbow to the close nipple on the other end of the solenoid valve but do
not over-tighten. Refer to Figure 6 for correct positioning of the elbow.
6. Install the Air System Section 3 assembly onto the TWPS. Refer to REPLACE and Air System
Section 3 Assembly.
7. Check the new Solenoid Valve XV-903 and attached piping for leaks.
055 00-10
