With effective closure time in mind, there are many approaches to quickly close valves without causing a large surge event. 1. Determine where a valve starts reducing flow and reach that point as early in the closure as possible. Since flow should not be reduced through this initial part of the closure, … See more While lengthening a valve closure time should theoretically mitigate a surge event, it is not always a direct relationship to slow flow. Remember, a valve closure’s pressure increase is … See more Valve closures are impacted by two major factors: the valve’s inherent characteristics unique to how the valve is constructed and the valve’s installed characteristics—how a valve interacts with a system. A valve’s inherent … See more WebTable 1: Effective closure time and resulting peak pressure for a variety of valve types closing over 30 seconds. Effective closure time is initiated by a 5% reduction in flow. …
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