TM 5-4220-227-14
5-35. Dump Valves (Cont).
WARNING
Leave 1 1/2 threads exposed on fitting when applying teflon tape. This will ensure that no
teflon tape will hang down inside the air system. Teflon tape should be wrapped in such a
manner that when the fitting is tightened the tape will not loosen. Failure to wrap teflon tape
correctly may result in contamination or blockage of the air system and subsequent possible
injury or death to the diver.
(4) Apply teflon tape on all pipe threads.
(5) Install silencer (9) on valve (7).
(6) Hold elbow fitting (8) and install valve (7) on elbow fitting (8).
(7) If removed, install spring (6), handle (5), stop plate (4), plate (3), and stem spring (2) on valve (7).
(8) Pressurize system and check corrections for leaks. Check valves for proper operation.
b. Repair. (figure 5-55)
(1) Remove dump valve (para. a. above).
(2) If not removed, remove nut (1), stem spring (2), plate (3), stop plate (4), handle (5), and spring (6).
(3) Remove nut (7), two stem springs (8), gland (9), packing support (10), top packing (11), and bottom packing (12).
(4)
Remove eight nuts (13), four stud bolts (14), and two flanges (15) from body (16).
(5)
Remove two preformed packings (17), seat spring (18), seats (19), support rings (20), and ball (21) from body
(16).
(6) Remove stem (22) and two stem bearings (23) from body (16).
(7) Clean all components using nonionic detergent cleaner and rinse with clean distilled water.
(8) Inspect all items and replace all items that are bent, cracked, worn, or otherwise damaged.
(9)
Install two stem bearings (23) on stem (22) and install stem into body (16).
(10)
Install ball (21), two support rings (20), seats (19), seat springs (18), and preformed packings (17) in body (16).
(11)
Install two flanges (15) on body (16) and secure with four stud bolts (14) and eight nuts (13).
(12)
Install bottom packing (12), top packing (11), packing support (10), gland (9), two stem springs (8), and nut (7).
(13)
Install spring (6), handle (5), stop plate (4), plate (3), stem spring (2), and nut (1).
(14)
Install dump valve (para. a. above).
5-120
