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TM 10-4930-241-13
4-22. BALL VALVE ASSEMBLY (4-INCH) REPAIR - cont.
c.
Inspection. Refer to figure 4-9.
(1)
Inspect ball (23) for deep scratches, dents, corrosion and signs of excessive wear.
(2)
Inspect bolts (15) and pipe ends (16 and 19) for stretched, stripped or damaged threads.
d.
Repair. Replace damaged or defective components.
e.
Assembly. Refer to figure 4-9.
(1)
Install two stop screws (35) on body (36) as marked during disassembly.
(2)
Install thrust bearing (33) and centering washer (32) on stein (34).
(3)
Install stem (34) and attached parts in body (36).
(4)
While holding stem (34) in place, slide centering washer (31), stem seals (30) and follower (29) over stem
and into body (36).
(5)
Position stop (28) on top of stem (34) as marked during disassembly. Install retaining nut (27).
(6)
Slide extension (25) into wrench block (26), then position wrench block on end of stem (34),
(7)
Aline bolt hole in extension (25) with hole in wrench block (26) and install bolt (24).
(8)
Turn extension (25) so that it is in closed position.
(9)
Install ball (23) in body (36). Slot in top of ball must mesh with flats on bottom of stem (34).
(10)
Install seal retainer (21), seat (22), and body seal (20) in body (36).
(11)
Position pipe end (19) on body (36).
(12)
Install seat (18) and body seal (17) on body (36).
(13)
Position pipe end (16) on body (36).
(14)
Install bolts (15) and nuts (14). Tighten nuts evenly in a cross pattern.
(15)
Apply thread sealant to male threads of female coupling half (5) and male coupling half (13).
4-33
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