Published in Symposium on the Design Performance and Applications of Valves, 83-WA/FE-16, December 23, 1983, pages 1-6. Copyright 1983 American Society of Mechanical Engineers (ASME). Publisher website: http://store.asme.org.
NOTE: At the time of publication, the author William W. Durgin was not yet affiliated with Cal Poly.
In some nuclear reactor containment isolation applications, butterfly valves with pneumatic actuators are used to close pipelines in the event of containment pressure transients resulting from postulated accidents. A model is developed which predicts the closure time history of such valve/actuator systems under prescribed transients. Examples are presented which show the importance of the valve and actuator characteristics. It was found that actuation delays of sufficient magnitude could allow the dynamic torque to exceed the available actuator torque, thus preventing valve closure.