In recent years electric valve actuators have grown in importance in modern power plants. Now they are recognised as major contributors to efficiency, economy and safety as well as facilitating the quick start-ups demanded by today's working practices and the emission reductions dictated by environmental legislation. Electric actuators may be required for an extensive range of duties encompassing isolation, regulation, modulation and failsafe operation of valves and dampers. This article looks at the selection and specification of the actuator and control system for each duty.
展开▼
