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Thanks for both replies, but I should have made it clear that I am aware of what the bypass valve is for, and I am perfectly able to read the correct setting from the curves supplied for a normal pump. It seems to me, though, that a differential bypass valve and the Smart Pump (model 25/6-30 for...

I wonder if somebody could advise as to the right pressure setting for a spring loaded bypass valve when used with a Wilo Smart Pump. It seems easy enough with a fixed bypass - simply shut off everything and adjust for the minimum flow rate, which is .25l/sec. With no fixed pressure curves for...