TM 5-4310-387-145-22.First Stage Valve Head and Valve Assembly (Cont).(8)Install line (2) and tighten two connector nuts (1).FOLLOW-ON MAINTENANCE(1)Install inlet filter and adapter assembly (para. 4-17).(2)Install storage tray (para. 4-15).b.Repair. (figure 5-30)(1)Remove valve head and valve assembly (para. a.).WARNINGCleanliness is imperative in maintaining and handling diving air system components. All toolsand parts must be kept free of oil, grease, rust, or other contamination in accordance withChapter 4, Section VI of this manual. Foreign substances within an assembly could result inequipment failure and possible injury or death to personnel.Ensure that all air lines and components removed or openings into the air system that providesbreathing air are covered with a plastic bag and secured with a rubber band or taped shut. Smallcomponents should be stored in a plastic bag and sealed. Failure to do so will cause air systemto become contaminated and could result in injury or death to the diver.(2)Remove bolt (1), upper valve body (2), preformed packing (3), two plates (4), rings (5), two plates (6), andrings (7) from lower valve body (8). Discard preformed packing (3).(3)Clean all items with TSP ultrasonic cleaner. Ensure all carbon and dirt deposits are removed. Dry allcomponents thoroughly.(4)Inspect valve head (9) and replace if cracked.(5)Inspect upper (2) and lower (8) valve bodies and replace if cracked, worn, or otherwise damaged.(6)Inspect plates (4) and (6) and replace if scored, excessively worn, bent, or otherwise damaged.(7)Inspect rings (5) and (7) and replace if scored, excessively worn, bent, or otherwise damaged.(8)Install two rings (7), plates (6), rings (5), and plates (4). Ensure concave plates oppose one another.(9)Install new preformed packing (3), upper valve body (2) and bolt (1). Torque bolt to 20 Ib-ft (27 Nm).(10)Install valve head and valve assembly (para. a.).5-64
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