<P> A cooling or heating water distribution system is in balance when the flow in the whole system (through the component terminal lines, distributing lines and main distributing lines) corresponds to the flow rates that were specified for the design of the system . If the correct balancing of the system is not established, this will result in unequal distribution of the flow so that there will be a surplus effect in some of the terminals, whereas the effect will be inadequate in others . As a consequence, the required heating / cooling will not be ensured in all parts of the installation . Practically, it is not possible to achieve a completely balanced system by manipulation of the piping or alteration of the pipe dimensions only . Only a correct set of balancing valves can ensure the correct distribution of the flow in the system . </P> <P> An automatic balancing valve uses the latest flow technology to ensure that the design flow rate is achieved at all times irrespective of any pressure changes within the system . </P> <P> In a variable primary chilled water system, the Design flow rate is determined by the water flow velocity in the tube of the coils . </P> <Ul> <Li> At Typical Conditions, 6 - 7 FPS </Li> <Li> Maximum 12 FPS </Li> <Li> Minimum 1.5 FPS (Based On A Reynolds #Of 7500) </Li> <Li> Minimum flow is typically 50% or less of the design flow . </Li> </Ul>

Difference between balancing valve and double regulating valve