Transcription of Edward Valves - Flowserve
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Edward Valves - Flowserve
Edward ValvesThe Rockwell Type A Stored Energy Actuator development and QualificationV-Rep 80-321 Numbers in brackets designate references listed at end of Rockwell Type A Stored Energy Actuator development and QualificationAbstractUntil about a dozen years ago, the operat-ing time for large (typically size 16-32),power-operated Valves in power plantswas usually measured in minutes. Thisposed few problems until safety con-siderations in nuclear plants changed therequired time frame from minutes toseconds. Basic ground rules also changedin that valve operation under emergencyconditions often had to be assured even ifall normal power supplies suddenly combination of requirements de-manded stored energy actuators that couldassure at least one half-cycle of operation(opening or closing a valve) withoutdependence on external power. In justover a decade, Valves and actuators forcritical services have traversed severalgenerations of development .
Edward Valves The Rockwell Type A Stored Energy Actuator – Development and Qualification V-Rep 80-3
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