TM 5-4320-218-15
(2) Remove the nuts and lockwashers se-
(6) Remove the cotter pin (7), nut (2),
and shoulder screw (6), Remove the
curing the check valve to the dis-
charge elbow on the pump.
weight (3) from the weight arm (5),
(3) Remove the check valve and gaskets.
(7) Remove the plugs (9) from the check
b. Disassembly (fig. 34).
valve body (8).
(1) Remove the capscrew (1.9), washer
c. Cleaning and inspection.
(1) W a s h all parts with an approved
(18), and sleeve (17) and disconnect
the spring (20) from the lever ( 16).
cleaning solvent and dry thoroughly
(2) Remove the capscrews (19 and 22),
with compressed air or a clean cloth.
washers (18), and sleeve (17) and re-
(2) Inspect the shaft for wear and dam-
move the bracket (23) and the spring
age. Replace a defective shaft,
(20).
(3) I n s p e c t the check valve body for
(3) Unscrew the setscrew (21) and slide
cracks and breaks; replace if neces-
off the lever (16) from the shaft (14).
sary.
Remove the key (15).
(4) Inspect all mounting and assembly
(4) Remove the packing nut (12) and
screws and studs for stripped or dam-
packing (11) from the check valve
aged threads.
Replace
damaged
body (8).
screws or studs as necessary.
(5) Unscrew the setscrew (4) and slide
(5) Replace a broken or cracked spring.
the weight arm (5) on the shaft far
(6) Discard the gaskets; remove and use
enough to remove the key (13). Re-
new gaskets for reassembly and instal-
move the key (13) and pull out the
lation.
shaft (14) ; remove the weight arm
d. Reassembly and installation. Reassemble
(5) and valve weight (3) from the
and install the check valve following the in-
structions in b above in the reverse order.
check valve body (8).
Section XV. GATE VALVES
gate valve at the flanges. Remove the valve
and gasket.
The gate valve is a valve in which the line-
b. Disassembly (fig. 35).
closing element is a gate in the form of a disk
(1) Remove the nut (2) and lift off the
(10) which is raised out of the way by means
handwheel (3) from the bonnet stem
of a threaded stem (8) to permit flow, and
(8).
lowered by the same means to halt flow. The
(2) Remove the packing nut (4), gland
line-closing element is composed of two disks
spring (5), packing gland (6), and
separated by a split wedge. As the stem is
packing (7) from bonnet (1).
turned to close the valve, the disks descend un-
(3) Remove the bonnet screws (14) and
til they are directly opposite the port. Then
lift off the bonnet (1) and gasket
the action of the beveled surfaces between the
(12) from the valve body (13).
t w o disks forces the disks apart squarely
(4) Lift out the bonnet stem (8), disk
against their seats, thus eliminating sliding ac-
s t e m (9), and the two disks (10
tion on the valve seats, Gate valves are oper-
and 11) as a unit from the body (13).
ated at fully open or fully closed positions. If
the gate fails to close, it may be abraded by dirt
(5) Unscrew the disk stem (9) from the
and scale in the fuel to point where it will no
bonnet stem (8), and remove the disks
longer serve as a tight valve.
(10 and 11) from the disk stem.
c. Cleaning, inspection, and repair.
129. Gate Valve Maintenance and
(1) Wash all parts with an approved
Repair
cleaning solvent and dry thoroughly
a. Removal. To remove a gate valve, remove
with compressed air.
the nuts, bolts, and lockwashers securing the
