TM 10-4610-234-13
4.24
GATE VALVE ASSEMBLY (4-INCH) MAINTENANCE.
This task consists of:
a. Removal
e. Repair
b. Disassembly
f. Assembly
c. Cleaning
g. Installation
d. Inspection
INITIAL SET-UP:
Tools:
Tool Kit, General Mechanics, Automotive (Appendix B, Sec. III, item 1)
Mallet (Appendix B, Sec. III, Item 2)
Vice (Appendix B, Sec. III, Item 2)
Materials/Parts Required:
Detergent, General Purpose (Item 1, Appendix D)
Rag, Wiping (Item 2, Appendix D)
Gasket, Flange (2) - X-3702C
Ring, Packing (3) - 235RF-05082P
Gasket, Body - 235RF-05092G
Gasket, Coupling - MS27030-9
NOTE
The following procedures describe a 4-inch gate valve with one male and
one female coupling installed. Repair of other 4-inch gate valves is similar.
a. Removal. Disconnect gate valve from water system (refer to para 2.10 to disconnect couplings).
b. Disassembly.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
Remove eight nuts (23), lockwashers (21), washers (19), and bolts (18).
Separate flanged coupling (17) and gasket (16) from valve body (15).
Remove eight nuts (20), lockwashers (22), washers (24), and bolts (25).
Separate flanged coupling (27) and gasket (28) from valve body (15).
Remove gasket (26) from flanged coupling (27).
Remove nut (1) and handwheel (2) from stem (10).
Remove packing nut (3), gland spring (4), packing ring (5) and packing gland (6).
Remove eight nuts (29), lockwashers (30), and bolts (7).
Remove bonnet (8), gasket (9), and attached parts from valve body (15).
NOTE
If needed, tap bonnet (8) with mallet to loosen sealing surfaces.
(10) Remove two screws (13) and separate discs (12 and 14) from disc riser (11).
(11) Remove disc riser (11) from stem (10).
(12) Unscrew stem (10) from bonnet (8) and remove stem.
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