This feature is a comprehensive guide to selecting an actuator. The complete guide will be featured as a bi-monthly article in Valve World throughout 2015. In this third article I will continue discussing the comparisons of pneumatic and electric actuators. Another satety accessory widely specified in the process industries on valve actuators is the spring-return (fail-safe) option. Upon power or signal failure a spring-return actuator drives the valve to a pre-determined safe position. This is a practical and inexpensive option with pneumatic actuators and is an important reason for the wide use of pneumatic actuators throughout the industry.
展开▼
