TM 10-4320-317-13
4-15. MAINTENANCE OF BUTTERFLY VALVE - (Cont)
NOTE
This is a general procedure for butterfly valves throughout the system.
(1)
Remove locknut (1), bolt (2), and handle (3) from stem of handle assembly (4).
(2)
Remove capscrews (5), lockwashers (6), flat washers (7), and handle assembly (4) from flange on
valve neck (8).
(3)
Loosen nuts (9) that se ure upper and lower housings (11 and 12) together. Remove nuts (9) and bolts
c
(10).
(4)
Carefully separate upper and lower housings (11 and 12) from valve body (13).
(5)
Remove O-ring (14) from lower stem (15).
(6)
Remove O-ring (16) from upper housing (11).
b.
REPAIR.
Repair is accomplished by replacement of parts.
c.
ASSEMBLE.
(1)
Apply potable water gasket lubricant to lower stem (15) and O-rings (14 and 16).
(2)
Install shaft into upper housing (11).
(3)
Install O-ring (16) onto upper housing (11).
(4)
Install O-ring (14) over lower stem (15).
NOTE
Wider slot on upper housing fits into the inner groove of valve body.
(5)
Align upper and lower housings (11 and 12) and install valve body (13).
(6)
Install two bolts (10) and nuts (9).
(7)
Install handle assembly (4) onto flange of valve neck (8) with flat washers (7), lockwashers (6), and
capscrews (5).
(8)
Install handle (3) onto stem with bolt (2) and locknut (1).
4-16
