TM 10-4320-303-13
4.12 STORAGE ASSEMBLY MAINTENANCE .
4.12.1 4 Inch Gate Valve Assembly Maintenance.
This task covers:
4.12.1.1 Removal
4.12.1.4 Repair
4.12.1.2 Disassembly
4.12.1.5 Assembly
4.12.1.3 Inspection
4.12.1.6 Installation
INITIAL SETUP
Tools
Equipment Conditions (Continued)
Tool Kit, General Mechanic's,
Quick-Disconnect Coupling Half removed,
Automotive, Section III, Item 1,
refer to paragraph 2.8.5.2.
Appendix B
Flange Adapter removed, refer to paragraph
Material/Parts
2.8.5.2.
Gasket (TM 10-4320-303-23P)
General Safety Instructions
Packing (TM 10-4320-303-23P)
Do not work on equipment without following
Equipment Conditions
standard shop safety precautions.
Pumping station shutdown, refer to
applicable technical manual
4.12.1.1 Removal. Placing the 4 inch gate valve assembly (Figure 4-13, 1) in the equipment conditions
specified above will remove the 4 inch gate valve assembly (1) from the storage assembly.
4.12.1.2 Disassembly.
a. Remove nut (2) and handwheel (3).
b. Remove packing nut (4).
c. Remove packing gland (5), packing (6), and spring (7). Discard packing (6).
d. Remove eight screws (8) and lock washers (9). Discard lock washers (9).
e. Remove bonnet (10) and gasket (11) from valve body (12). Discard gasket (11).
f. Unscrew valve stem (13) and remove from bonnet (10).
g. Remove disc assembly (14) from valve stem (13).
h. Remove two screws (15).
i. Separate two discs (15 and 16) from pull nut (17).
4.12.1.3 Inspection.
a. Inspect handwheel (3), bonnet (9), valve body (11), bonnet stem (12), disc stem (13), discs (14 and
15) and two seat rings (16) for corrosion, cracks, holes, bends or damage.
b. Inspect nut (2), packing nut (4), packing gland (5), eight screws (7), and lock washers (8) for corrosion
or damage.
4.12.1.4 Repair. Repair consists of replacing defective or damaged components.
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