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Requirement of relief valve

Question asked by m-arunkumar on Jan 9, 2019
Latest reply on Jan 10, 2019 by sourabhchowdhuri

1. Why does NFPA 20 mandates relief valve for centrifugal pumps if it is driven by electrical driver with VFD.

2. Why the relief valves are not necessary in case of normal electrically driven pumps.