Opportunity for check valves to slam frequently occurs at pump shutdown. What causes the slam?Ī check valve relies on gravity and/or reverse flow to close completely. ![]() They do get a lot of attention, however, when they slam. They don’t require power to function, and they don’t require a whole lot of attention or maintenance. They use forward flow to open the valve, then automatically close when flow stops, preventing reverse flow from making its way back through the valve.
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