NIBCO Circuit Balancing Valve F737 5-to-8-inch User Manual
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NIBCO Technical Services • Phone: 1.888.446.4224 • Fax: 1.888.336.4224
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The valve is handwheel operated with clockwise rotation to close and counter clockwise to
open.
Valve Position
Valve position is confirmed from the linear scale (red detail on white background) viewed
through the aperture which also provides the datum reference. See Figure 1 overleaf.
The rotary decimal scale on the handwheel hub is used to determine accurate valve position
between adjacent main divisions (e.g. position 2 and position 3 on the linear scale).
See Figure 2 overleaf.
Double Regulating Device
F737 valves are shipped with the double regulating device (memory stop) fully retracted to allow
unrestricted valve opening and closing.
The double regulating (memory stop) device is located beneath the red cap in the center of the
handwheel which is easily removed by hand.
After the valve position has been finally established and recorded during commissioning, the
double regulating stop can be set. See Figure 3 overleaf.
Locate a screwdriver in the slot on the double regulating stop and rotate counterclockwise until
a positive stop is felt. No further effort is required.
Replace the key and red cap.
For any technical enquiries please call NIBCO Technical Services.