NIBCO Rubber-Seated Butterfly Valves - Manual (Page 2)

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I. SHIPMENT & STORAGE
NIBCO butterfly valves are individually boxed thru the 12" size. The 14" through 60"
butterfly valves are shipped individually with the faces covered using cardboard or
plywood to protect the flange sealing surfaces.
The disc is shipped in the nearly closed position to protect the sealing edge and
prevents the liner from taking a temporary set. The stem bushings and disc edge have
been coated with a factory-applied lubricant to prolong storage and service life.
Valves may be shipped or stored in any position. Storage should be limited to 10 years
indoors with a temperature range of 40º F to 90º F.
II. BUTTERFLY VALVE INSTALLATION GUIDELINES
NIBCO butterfly valves are bi-directional and may be installed with flow in either
direction.
Flanged, lug and wafer style valves are designed and suitable for installation between
ANSI Class 125 and/or 150 flanges. Cast iron flat-face, steel raised-face, both slip-on
and weld-neck, and bronze or plastic flanges may be used (See Table 1 below).
Generally raised-face flanges should not be used with cast iron lug style valves (NIBCO
N2002 and LC2000 series valves). Because of the unique seat design, NIBCO (2” – 48”)
butterfly valves do not require the use of flange gaskets and can be used for dead end
service without a downstream flange. Grooved style valves connect to metallic pipe of
IPS per AWWA C606.
The valve can be installed in any horizontal or vertical position. If a choice of stem
positions exists, the valve should be installed with the stem in the horizontal position; this
will minimize seat wear by distributing the stem and disc weight evenly. Also, if the
media is abrasive, the horizontal stem position is highly preferred.
These valves have been designed so that the disc, in the open position, will clear the
inside diameter of the schedule 40 and 80 steel pipe. Care should be taken when
installing a butterfly valve adjacent to lined pipe, as-cast fittings, or schedule 80 plastic
pipe. In some cases the disc in the opened position will interfere with the adjacent
component.
Butterfly valves should be installed a minimum of six (6) pipe diameters from other line
components. This is not always practical but it is important to design in as much distance
as possible. Interference may occur when valves are installed directly to the outlet flange
of a swing check, silent check, or reducing flange. Check valve and butterfly valve
combinations are very popular; normally a short spool piece is required between the
valves.
When using a valve with gear operator attached, it may be desirable to have the
handwheel positioned to allow easy access, or for use of an optional adjustable sprocket
rim (chain wheel) for remote operation. Before valve installation, please review Gear
Operator Installation and Handwheel Positioning section on page 3 of this booklet.
These instructions illustrate how to orient the gear operator handwheel position in