NIBCO Rubber-Seated Butterfly Valves - Manual (Page 11)

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VIII. MAINTENANCE AND REPAIR – LD/WD-2000/3000/5000 SERIES –
2” THRU 12” SIZE VALVES ONLY
Due to the many unique features in the NIBCO butterfly valve design, there is no regular
maintenance or lubrication required. These valves are field repairable with the stem,
disc, seat and body, collar bushing and O-ring seals available as individual components.
IX. REPAIR
Remove handle, gear operator or actuator from the cast-mounting pad. Unscrew the
collar bushing** and pull out the stem; this will allow the disc to be removed as well.
Replacement of the damaged component can be accomplished at this time. The body,
seat and bushings are provided from the factory as one assembly rather than three
separate components.
To reassemble, place the disc inside the seat in the open position. Align the stem hole
through the body and disc. Insert the stem into the body and disc, making sure to align
the geometric drive flats between the stem and disc.
Replace both stem and body O-ring seals on the collar bushing and insert over the stem.
Screw the bushing into the body until flush with top of mounting pad. Replace lever, gear
or actuator and check for function before reinstalling in line.
Refer to assembly drawing below for individual components.
** Never remove the collar bushing with the system under pressure.
MATERIAL LIST
ITEM DESCRIPTION
1 Lever Handle
2 Throttle Plate*
3 Disc
4
Wafer Body and Liner
5 Hex Bolt (3/8 x 2)
6 Collar Bushing
7 O-ring Body Seal
8 O-ring Stem Seal
9 Stem
10 Washer (3/8 x 2)
11 Nut (3/8-16 x 2)
* Shown with optional
Infinite-Position Kit.