NIBCO Rubber-Seated Butterfly Valves - Manual (Page 5)

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7b. Gear operators without adapter bushing:
 Align gear operator (3) bore with valve stem (5) and align with desired keyway.
Keyway selection will determine handwheel orientation position.
 Slide gear operator assembly onto valve stem (5) until seated with valve top flange.
8. Secure gear operator (3) to valve top flange (6) using supplied* fasteners (7 & 8).
9. Reinstall pointer cover plate onto gear operator removed in Step 3 above. Arrow should
be aligned to indicate SHUT position.
10. Install flag and secure with Allen Screw. (Fire Protection gear operators only).
11. Rotate handwheel from SHUT to Full OPEN positions several times to assure proper
orientation. See Stop Adjustment Procedure Section of this instruction booklet on page 5
if stop alignment adjustment is necessary.
12. Proceed with valve installation into piping system.
* A minimum of two fasteners is required, installed in opposite diagonal corners.
For Fire Protection gear operators, it is critical to use only the key supplied with gear
operator in order to conform to UL, FM and ULC specifications.
NOTE: Connection of gear operator to valve stem varies depending on gear
operator model, size and style. The adapter bushing and key may be different from
illustration shown.
IV. VALVE INSTALLATION PROCEDURE – FLANGE, LUG & WAFER STYLE ONLY
Always position the connecting pipe flanges accurately in the line, allowing sufficient
space between the flanges for the valve. Make sure the pipe flange faces are clean of
any foreign material such as scale, metal shavings or welding slag. Valves should be
installed with the disc in the closed position to prevent damage to sealing surfaces.
1. Carefully insert the valve between the pipe flanges. Do not apply any lubricants to
the seat faces as this may damage them.
2. Line up, center and secure the valve between flanges using desired bolts or studs as
listed in Table 4 on next page. Do not tighten bolts at this time.
3. Carefully open the valve to assure free unobstructed disc movement. Disc
interference may result when valves are installed in pipelines having smaller than
normal inside diameters, such as heavy wall pipe, plastic-lined pipe, as-cast flanges
or reducing flanges. Interference can also occur when connecting directly to a swing
check or silent check. Suitable corrective measures must be taken to remove these
obstructions, such as taper boring the pipe or installing a spacer or spool piece.
4. After proper operation is verified, tighten the bolts to the minimum recommended bolt
torques listed in Table 3 below using a cross-over pattern, also shown below in
Figure 3. NOTE: When installing valves NPS 14” and larger between two flanges, it
is recommended that the cartridge liner be evenly compressed from both side of the
mating flanges. NIBCO recommends a multi-stepped process utilizing the cross-over
pattern be used to draw the flanges against the liner from both side of the valve at
the same rate, ensuring the liner is compressed evenly. This method differs from the
practice used on smaller valves, wherein one flange side is completely tightened
before moving to the opposite side.