TM 10-4320-345-13
4-21. GATE VALVE ASSEMBLY (4-INCH) REI'AI R - cont.
e.
Assembly.
Assemble gate valve. Refer to figure 4-12.
(1)
Screw stem (13) all the way into bottom of bonnet (11), then back out stem three full turns. Do
not allow stem to move from this position.
(2)
While holding stem (13) in place, screw disc riser (17) onto stem until bottom of riser is flush with
end of stem.
(3)
Position discs (15 and 16) on riser (17) and install two screws (14).
(4)
While preventing stem (13) from turning in bonnet (ll), turn discs (15 and 16) and riser (17) left
(counterclockwise) onto stem until top of discs contact flanged bottom of bonnet.
(5)
Position gasket (12) on valve body (18).
(6)
While holding stem (13) in position, lower bonnet (11) and discs (15 and 16) into valve body (18)
Do not rotate discs mole than 1/4 turn to aline discs with body.
(7)
Install eight flat washers (10), screws (9), lockwashers (8) and nuts (7) in valve body (18) and
bonnet (11).
(8)
Slide packing ring (6) over stem (13) and down into bonnet (11).
(9)
Slide packing gland (5) and gland spring (4) over stem (13).
.
(10)
Slide packing nut (3) over stem (13) and tighten onto top of bonnet (11).
(11)
Position handwheel (2) on stem (13) and secure with nut (1).
Install gate valve. Refer to figure 4-11.
NOTE
Install female coupling with locking arms positioned as shown.
(12)
Position gasket (15) and female coupling (14) on gate valve (16).
(13)
Install eight flat washers (13), screws (12), flat washers (11), lockwashers (10) and nuts (9).
NOTE
Ensure gasket is fully seated in groove of coupling.
(14)
Install gasket (8) in female coupling (14).
4-48
