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TM 10-4320-342-24
3-17. BALL VALVE (200/600 GPM PUMP) REPAIR - continued.
(2)
Cleaning and Inspection.
WARNING
Dry cleaning solvent, P-D-680, TYPE III, is potentially dangerous to personnel and
equipment. Eye and skin protection is required. Avoid repeated and prolonged
skin contact. Wash immediately after exposure. Do not use near open flame or
excessive heat. Use only in areas with good ventilation.
(a)
Using wiping rags and cleaning solvent, remove dirt and contaminants from all components.
(b)
Inspect threaded parts for stretched, stripped, damaged or corroded threads.
(c)
Inspect valve body for cracks, damage and corroded sealing surfaces.
(d)
Inspect plates for deformation and damaged threads.
(e)
Inspect insert for cracks and excessive corrosion.
(f)
Inspect ball for corrosion, scratches, gouges, chips and other surface damage that could result in leaks.
(3)
Repair.
Replace damaged or defective components and all mandatory replacement parts.
(4)
Assembly. Refer to Figure 3-8.
(a)
Apply a thin coat of lubricant to seats (14 and 15), seals (13, 16 and 18) and ball (12) to aid assembly.
(b)
Position valve body (6) on bench with large opening facing up.
(c)
Install seat (15) in valve body (6) with flat surface of seat facing down.
(d)
Press lower seal (18) into stem bore in valve body (6).
(e)
Install stem (17) up through stem bore in valve body (6).
CAUTION
To prevent premature failure of bail valve, upper stem seals must be installed
correctly. Bottom seal of the seal set must be installed first with flat surface down.
Remaining seals must be stacked as shown.
(f)
While holding valve stem (17) in place, install upper seal (16) over valve stem (17) and into valve body (6).
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