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Old 03-10-22, 07:29 PM   #20
JRMichler
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Join Date: Apr 2012
Location: Phillips, WI
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A simple check valve has a metal disk. The weight of that disk is probably enough to stop convection flow. I suggest just adding a check valve after the pump. I would not use a check valve with a spring because residential hydronic circulating pumps are low head pumps - they create very low pressure. The pressure needed to push the spring open will reduce flow, and could completely stop the flow.

And you are correct. A stopped centrifugal pump will not stop water flow. The water flows right through the pump.
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