TM 5-4220-227-14
6-22. Back Pressure Regulators.
This task covers:
Repair
INITIAL SETUP:
Tools
Materials/Parts (Cont)
General Mechanic's Tool Kit
Bands, Rubber (Item 4, Appendix E)
(NSN 5180-00-177-7033)
Bags, Plastic (Item 3, Appendix E)
Wrench, Torque (NSN 5120-00-227-2540)
Cloth, Lint Free (Item 6, Appendix E)
Detergent, Nonionic (Item8, Appendix E)
Materials/Parts
Distilled Water (Item 9, Appendix E)
Valve Kit, Standard
Equipment Condition
Valve Kit, Soft Goods
Grease, Halocarbon (Item 13, Appendix E)
Back pressure regulator removed (para. 5-32).
Repair. (figure 6-40)
WARNING
To prevent the spread of disease, serious injury and/or death, oxygen breathing systems must be
maintained hygienically clean and free from dust, dirt, and all hydrocarbon contamination. Refer to
oxygen system prework procedures para. 4-10 to avoid violating this warning.
NOTE
There are two back pressure regulators. Replacement of each regulator is the same.
(1)
Remove four screws (1) and remove cover (2).
(2)
Remove six screws (3) securing dome (4) to regulator body (5), and remove dome (4).
(3)
Remove center seal diaphragm (6), preformed packing (7), back-up diaphragm (8), diaphragm (9), spring (10),
valve stem cap (11), washer (12), shaft force (13), preformed packing (14), valve stem (15), back-up diaphragm
(16) from the center nut diaphragm (17).
(4)
Remove center nut diaphragm (17) from regulator body (5).
(5)
Remove preformed packing (18), balance piston (19), seat retainer (20), and valve seat (21) from
regulator body (5).
(6)
Remove six screws (22) that secures balance dome (23) to regulator body (5) and remove balance dome.
6-90
