TM 10-4610-243-13
4-24.
BUTTERFLY VALVE ASSEMBLY REPAIR - cont.
(3)
Remove eight nuts (4), lockwashers (5), flat washers ( 6 and 11) and screws (10).
(4)
Remove male coupling (7) and gasket (8) from butterfly valve (14).
(5)
Remove female coupling (12) and gasket (13) from butterfly valve (14).
(6)
Remove gasket (9) from female coupling (12).
Butterfly valve disassembly. Refer to figure 4-17.
(7)
Remove cotter pin (1) and pin (2) from handle (3). Lift handle and attached spring (4) from stem (8).
(8)
Remove two socket head screws (5) and stop plate (6) from body (19).
(9)
Remove top seal (7) from bottom of stop plate (6).
(10)
Pull to extract top stem (8) and attached parts from body (19).
(11)
Remove seal (9),o-ring (10), top bearing (12) and o-ring (11) from top stem (8).
(12)
Using punch, drive out spring pin (13) from body (19) and bottom stem (14).
(13)
Pull bottom stem (14) and attached parts from body (19).
(14)
Remove bottom bearing (15) and o-ring (16) from bottoms stem (14).
(15)
Push disc (17) from body (19).
(16)
Remove sleeve (18) from body (19).
b.
Cleaning.
(1)
Wash all components with clean water and detergent.
(2)
Rinse components in clean water and dry with wiping rag.
c.
Inspection.
(1)
Inspect male coupling (7, figure 4-16), female coupling (12) and cap (3) for cracks and corrosion.
(2)
Inspect body (19, figure 4-17), handle (3), disc (17) and stop plate (6) for cracks and corrosion.
(3)
Inspect top stem (8) and bottom stem (14) for cracks, deep scratches and corrosion.
d.
Repair. Replace damaged parts and all sealing components.
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