Quote:
Originally Posted by widebody911
What I don't understand is why I get the hammer when the valve opens.
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The valve opening rate coupled with the system pressure is what determines water hammer, as I recall. If you can change the valve closure rate it will eliminate the hammer effect. This is why you see "no-slam" check valves used as pump control valves and other control valve modulated on closure rate so as to prevent system transients like this.