Elkhart Brass 70133000 Electric Valves - Manual (Page 35)

35
IV VALVE ASSEMBLY & DISASSEMBLY
CAUTION: Do not attempt to remove an actuator from a valve that is under pressure. Doing so
may cause the actuator to swing violently. Isolate the valve by closing the valves that are just
upstream and then downstream (in that order) of the valve before attempting to remove the actuator
or close upstream valves and assure line is vented.
VALVE DISASSEMBLY
1. Turn the disc to the nearly closed position (ten degrees or less), loosen and remove all flange bolting.
Spread the flanges if necessary and remove the valve from the pipeline.
2. Turn the disc to where it is almost out of the seat. Remove the actuator if still mounted.
3. Remove body screws for the 990 valve (see Illustration 2, part 3) and separate the body halves.
4. Remove the upper and lower body halves from the seat (Illus. 2, part 4) and the stem shafts.
5. Remove the seat (Illus. 2, part 4) from the disc-stem (Illus. 2, part 2) by elongating the seat (oval
shape) in the direction of the stem shaft and remove the lower stem from the seat. The entire disc-stem
(Illus. 2, part 2) may then be removed from the seat (Illus. 2, part 4).
6. If needed, remove the upper bushing (Illus. 2, part 5) and inspect for damage. Replace if needed.
7. If needed, remove the stem packing (Illus. 2, part 6) after bushing removal and inspect for tears or
deterioration. Replace if removed from stem bore.