NIBCO Circuit Balancing Valve 1710 - Manual (Page 2)

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This valve is a combined regulating and flow measurement device and must be installed with
five diameters of straight pipe of the same diameter as the valve without intrusion upstream of
the valve. Three diameters of straight pipe are required on the valve outlet.
The valve must be installed with the direction arrow on the body coincident with the direction of
flow in the pipeline.
Care is needed during installation to provide free access to enable the valve to be fully
operated, regulated and set in the required position. Care should be taken regarding the
orientation of the test points to give sufficient room for the manometer probe connection.
NOTE: If vent/drain plugs are provided, careful consideration is necessary during
installation to ensure they may be utilized effectively.
OPERATION
When used for the balancing of water distribution systems, valves should always be in the fully
open positions at the commencement of any commissioning or flushing exercise.
Regulation is accomplished by rotating the handwheel clockwise. The disk position corresponds
with the decimal indicator viewed through the display window. The closed position has a
decimal indicator reading 0-0.
VALVE SETTING
When the regulated position is achieved, the double regulating feature is set as follows:
1. Remove the access screw; do not remove the handwheel.
2. Regulate the inner stem clockwise (using a thin blade screwdriver) until a stop is felt.
The regulated memory position is now set.
3. Refit the access screw.