Tom, the valve is doing what it's supposed to do, namely keeping too much water (pressure/ volume) from going to the Polaris. Apparently you now have more water being diected to that line - this could be from shutting down a water feature, closing a set of returns, having a closed or obstructed return or you may have done something to increase the flow across the system - cleaned the filter, fixed a leak, unclogged the impeller or pump basket or removed an obstruction in a suction line, bypassed the solar or upgraded the pump. Some of these are unlikely but have you done anything like what I've suggested?
I'd love to hear more about this when you figure out what happened. Good Luck!
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