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Balancing valve


Definition


A Balancing valve is used to regulate and measure the rate of flow of water. The valve can positively isolate the flow and be set at an intermediate position to maintain the design flow rate. Pressure tapping points on either side of the seat provide the means for flow measurement.


Options


Extended Test Points


Pre-formed Insulation


NIBCO Setting Tool


Pre-Setting Label


Valve Design


The Fig. 1710 Balancing globe valve is a straight pattern design having the stem/disc arrangement vertical to the direction of flow compared to conventional oblique "Y" pattern globe valves. The full open position in straight pattern globe valves has higher differential pressure (pressure losses) than an oblique pattern valve. The flow capacity of the straight pattern valve in the full open position is typically 20% lower than the oblique type.


The higher pressure signals on the Fig 1710 balancing valve will assist with flow measurement at lower flow rates, extending the full open flow range by 20%. The characteristic at the 25% open position is due to the disc profile and is not affected by the body pattern.


The Fig. 1710 Balancing valve is a non-rising stem design incorporating a parabolic (plug) shaped disc. Each valve is fitted with 2 pressure test points, red strap indicating upstream (high pressure) and blue strap indicating downstream (low pressure) for differential pressure measurement. The handwheel assembly incorporates an indicator window, with a Black numeral for full turns and a Red numeral for tenths of turns. The main valve spindle incorporates an inner spindle for double regulation memory stop and valve position setting.


Operation


When used for balancing water distribution systems, valves should always be in the fully open position at the commencement of any commissioning or flushing exercises. Regulation is accomplished by rotating the handwheel clockwise. The disc position corresponds with the decimal indicator viewed through the handwheel window. Setting of double regulated position memory stop is described under Operating Instructions.


Installation


This valve is a combined regulating and flow measurement device and must be installed with five diameters of straight pipe of the same nominal diameter as the valve and without intrusions 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 the 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 manometer probe connection for flow measurement.


Note:-If vent/drain plugs are provided, careful consideration is necessary during installation to ensure that they may be utilized effectively.