TM 5-4220-227-146-22. Back Pressure Regulators.This task covers: RepairINITIAL SETUP:ToolsMaterials/Parts (Cont)General Mechanic's Tool KitBands, 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/PartsDistilled Water (Item 9, Appendix E)Valve Kit, StandardEquipment ConditionValve Kit, Soft GoodsGrease, Halocarbon (Item 13, Appendix E)Back pressure regulator removed (para. 5-32).Repair. (figure 6-40)WARNINGTo prevent the spread of disease, serious injury and/or death, oxygen breathing systems must bemaintained hygienically clean and free from dust, dirt, and all hydrocarbon contamination. Refer tooxygen system prework procedures para. 4-10 to avoid violating this warning.NOTEThere 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) fromregulator body (5).(6)Remove six screws (22) that secures balance dome (23) to regulator body (5) and remove balance dome.6-90
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
