TM 5-4220-227-14
(7)
Remove button spring (24), spring (25), button spring (26), ring retainer (27), ring retainer (28), washer (29),
preformed packing (30), ring backup (31) from balance dome (23).
(8)
Remove preformed packing (32) from balance dome (23).
(9)
Remove bolt (33) and nut (34) from balance dome (23).
(10)
Clean all components using nonionic detergent cleaner and rinse with clean distilled water.
(11)
Inspect all items and replace all items that are bent, cracked, worn, or otherwise damaged.
(12)
Install bolt (33) and nut (34) into balance dome (23).
(13)
Lubricate all preformed packings.
(14)
Install preformed packing (32) into balance dome (23).
(15)
Install ring backup (31), preformed packing (30), washer (29), ring retainer (28), ring retainer (27), button spring
(26), spring (25), and button spring (24) into balance dome (23).
(16)
Install balance dome (23) on regulator body (5) and secure with six bolts (22).
(17)
Install valve seat (21), seat retainer (20), balance piston (19), and preformed packing (18) into regulator body (5).
Torque seat retainer to 95-100 in. lbs.
(18)
Install center nut diaphragm (17) into regulator body (5).
(19)
Install backup diaphragm (16), valve stem (15), preformed packing (14), shaft force (13), washer (12), valve
stem cap (11), spring (10), diaphragm (9), backup diaphragm (8), preformed packing (7) and center seal
diaphragm (6) into center nut diaphragm (17). Torque valve stem cap to 45-50 in. lbs. Torque center seal
diaphragm to 80-85 in. lbs.
(20)
Install dome (4) onto regulator body (5) and secure with six screws (3). Torque screws to 170-180 in lbs.
(21)
Install cover (2) and secure with four screws (1).
FOLLOW-ON MAINTENANCE
Install back pressure regulator (para. 5-32)
6-93
