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is closed between a stock recirc and one with the GHK installed... a stock recirc will be wide open for a considerable amount of time (any dP > 1 psi to be exact) whereas the GHK is opening/closing at dP of 12 psi. That's a big difference in the pressure acting on the valve at the closing event. I'm with Ash, it's occuring a the valve and I'm not concerned about it.
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