A couple of observations:
Using a relief valve to regulate pressure is a bad idea. Relief valves
generally are designed to open at a set pressure, but not necessarily to
close at that pressure. They They are emergency devices, intended to
operate only if the driver over speeds. To regulate pressure, use a
pressure regulating valve.
Feeding the discharge from a relief valve back into the pump suction
won't accomplish what is intended. It's sort of like trying to pick
yourself up by your bootstraps. What will happen if you run the pump
with no flow is that the relief valve will open,water will circulate and
reach equilibrium at a pressure higher than the relief valve setting.
Yt's thought by many that it is better to put the PRV on the discharge
side of the pump because, if there is a problem, the higher pressure
will be more likely to clear it. There really isn't a good reason to put
a PRV on the suction side.
Joe
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