TM 10 4320-317-13
4-16. MAINTENANCE OF 4-INCH GATE VALVE - (Cont)
(2)
Remove handwheel (2).
(3)
Turn packing nut (3) CWW and remove.
(4)
Remove packing gland spring (4) and packing gland (5).
(5)
Remove packing (6).
(6)
Remove bolts (7), nuts (8), and lockwashers (9).
(7)
Remove bonnet (10) and gasket (11) from valve body (16).
(8)
Remove valve stem (12) from valve bonnet (10).
(9)
Remove pull-nut (13) and discs (14 and 15) from valve body (16).
(10) Remove setscrews (17), and discs (14 and 15) from pull- ut (13).
n
b.
INSPECT.
(1)
Inspect parts for pitting and defects. Replace defective parts.
(2)
Inspect discs and seat rings in body for pitting. Replace both items if either are pitted.
c.
REPAIR.
Repair is accomplished by replacement of parts.
d.
ASSEMBLE.
(1) Clean gasket and mating surfaces.
(2)
Position discs (14 and 15) onto pull-nut (13).
(3)
Install setscrews (17) in discs (14 and 15).
(4)
Install assembled discs (14 and 15) into valve body (16) making sure guides on discs are in gro ves in
o
valve body.
(5)
Install valve stem (12) into pull-nut (13).
(6)
Screw valve stem (12) into valve bonnet (10).
(7)
Align and install gasket (11) and valve bonnet (10) onto valve body (16).
(8)
Install bolts (7), lockwashers (9), and nuts (8).
(9)
Install packing (6).
(10)
Install packing gland (5).
(11) Install gland spring (4).
(12) Install packing nut (3).
(13) Install handwheel (2) and handwheel nut (1) onto bonnet stem (12).
(14) Check handwheel (2) for smooth operation.
4-18
