If you have pumping stations-either upstream or downstream of the pressure reducing valves-that generate rapid variation of flow and pressure, the valves may momentarily work out of specification.If you have applications within the network where there are rapid changes in flow (for example, closure of hydrants or main line isolation valves), short burst pressures may be generated which are above the normal accuracy of the pressure reducing valves.If control valves are not maintained within the designed service intervals the accuracy of regulation can reduce, causing variable downstream pressure.There are several key reasons why the regulated downstream pressure may vary: In a water supply pressure reducing station, the control valves regulating pressures to the network are generally accurate regardless of flow rate and inlet pressure range. Why do we need a downstream pressure relief valve? In this piece, you’ll learn why pressure relief valves are useful, find recommendations for a range of models depending on your application and objectives, and learn how to choose the correct size for a relief valve.
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