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TM 10-4930-240-13
4-19. PRESSURE REGULATING VALVE ASSEMBLY REPAIR - cont.
CAUTION
To prevent premature failure of diaphragm, nut must be tight. If nut is loose
on stem, diaphragm could pull loose and tear under pressure.
(4) Install diaphragm (9), diaphragm washer (8) and nut (7) on stem (14). Tighten nut until diaphragm
cannot be twisted on stem.
(5) Check compression of disc (11) between disc guide (13) and disc retainer (10). Disc should be
compressed very lightly. If disc Is deformed, install additional spacer washers (12) between disc
guide and disc retainer as required.
CAUTION
To prevent damage to stem or seat, lower stem straight into seat.
(6) Lower assembled diaphragm (4) into body (17) Make sure end of stem (14) mates correctly with seat
(15).
(7) Aline holes In diaphragm (9) with holes on body (17). If required, diaphragm may be stretched to fit
over holes.
(8) If removed, install spring cover (5) In valve cover (3).
(9) Install spring (6) on stem (14).
CAUTION
To prevent damage to spring cover or valve stem, valve cover must be
lowered straight onto stem without twisting or binding.
(10) While matching alinement marks made during disassembly, lower valve cover (3) over stem (14)
and onto body (17).
(11) Install eight bolts (2). Tighten bolts evenly in a cross pattern.
Assemble Strainer. Refer to figure 4-11.
(12) Apply anti-seize tape to male threads of plugs (1 and 7) and reducer (4).
(13) If removed, install plug (7) in reducer (4).
(14) Push strainer (6) up into body (8).
(15) Install packing (5) on reducer (4).
(16) Install reducer (4) on body (8).
(15) If removed, install plug (3) In body (8).
(17) Install packing (2) on plug (1).
(18) Install plug (1) on body (8).
4-34
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