the pressure gauge and water flow manometer do the same job. My question related to measuring the flow rate of condenser or chilled water pump. The sqaure root of pressure drops across the balancing valve multiplied with cv rate of balancing valve. Why do not depend gauges to know the pressure difference across the balancing valve?? Third party companies use the monomer for commissioning purpose. I thing manometer gives the accuracy. what is your comment. Thanks
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