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TM 10-4930-241-13
4-17. GATE VALVE (4-INCH) REPAIR(TYPICAL).
NOTE
The following procedure applies to all gate valves in the AFSSP.
This task covers:
a.
Disassembly
b.
Cleaning
c.
Inspection
d.
Repair
e.
Assembly
INITIAL SETUP:
Tools:
Wiping Rag
(Item 2, App E)
General Mech. Tool Kit (Item 1, App B)
Packing Ring
(Item 18, App I)
Equipment Condition:
Gasket
(Item 19, App I)
4-inch gate valve removed (para 2-21)
Lockwasher
(Item 20, App I)
Material/Parts:
Cleaning Solvent
(Item 1, App E)
NOTE
Ensure that all parts identified as mandatory replacement parts are discarded and replaced with new
components.
a.
Disassembly. Refer to figure 4-6.
(1)
Remove nut (1) and handwheel (2) from stem (12).
(2)
Remove packing nut (3), gland spring (4), packing gland (5) and packing (6) from top of
bonnet (10).
(3)
Remove nuts (7), lockwashers (8), and cap screws (9) from valve body (17) and bonnet (10).
NOTE
If needed, tap bonnet with mallet to loosen sealing surfaces.
(4)
Remove bonnet (10), gasket (11), and attached parts from valve body (17).
(5)
Remove two allen screws (13) and separate discs (14 and 15) from disc riser (16).
(6)
Remove disc riser (16) from stem (12).
(7)
Unscrew stem (12) from bottom of bonnet (10).
b.
Cleaning.
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 hands immediately after
exposure. Do not use near open flame or excessive heat. Use only in areas with good ventilation.
Using wiping rags and cleaning solvent, remove dirt and contaminants from all components.
4-21
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