TM 10-4610-237-12
4.16 GATE VALVE ASSEMBLY (2-Inch ) REPAIR - Continued.
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 valve body (13) for cracks and stripped or damaged threads.
(2)
Inspect disc (12) for cuts or scratches across sealing surfaces.
(3)
Inspect bonnet (10) for cracks and stripped threads.
(4)
Inspect stem (11) for stripped, galled or damaged threads.
(5)
Inspect female coupling (2) for cracks, broken lock arms and damaged threads.
(6)
Inspect male coupling (3) for cracks and damaged threads.
d.
Repair. Replace al defective parts. Do not reuse packing (8) or gasket (1). If disc (12) or valve body (13) is
damaged, replace entire valve.
e.
Assembly. Refer to Figure 4-7.
(1)
Screw stem (11) into bottom of bonnet (10).
(2)
Install new packing (8) and packing gland (7) over stem (11) and into bonnet (10).
(3)
Screw packing nut (6) onto bonnet (10) only finger tight.
(4)
Slide disc (12) onto end of stem (11).
(5)
Lower bonnet (10) and attached parts onto valve body (13). Make sure disc (12) fits in valve body seat
(6)
Install bonnet ring (9) on valve body (13). Tighten packing nut (6).
(7)
Install handwheel (5) and handwheel nut (4) on stem (11).
NOTE
Ensure gasket is fully seated in groove of coupling.
(8)
Install gasket (2A) in female coupling (2).
NOTE
Ensure that anti-seize tape is applied in the same direction as the threads.
(9)
Apply anti-seize tape to threads of female coupling (2). Using pipe wrench, screw coupling into valve body
(13).
(10)
Secure plug (1) to female coupling (2) using ring (1 A).
Change 1
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