Fail-safe actuators are often used on crucial damper and valve applications that require protection from excessive temperatures. Back in the days when pneumatics ruled commercial HVAC controls, fail-safe protection was easy because pneumatic actuators are inherently fail-safe. When electric actuators began replacing pneumatics, however, things got more complicated. Capacitor-driven actuators now have many advantages over older spring-return electric actuators…
Post time: Jun-04-2017