Title: When to choose electric vs pneumatic actuators

Automated valves need actuators to operate. Since their technologies are so different, determining whether to choose a pneumatic or electric actuator for a process system may seem confusing. Electric rotary actuators are known for their high levels of precision, control, and energy efficiency. Typically, they are used for on/off and modulating control with fail in last place upon loss of power. Pneumatic rotary actuators are initially less expensive, have less moving parts, and hence are easier to maintain. Pneumatic actuators are commonly used when spring return failsafe conditions are required. For fail-safe applications, pneumatic actuators are less expensive than electric actuators, which require battery back-up for fail-safe functionality. Each technology has its inherent advantages and disadvantages and the criteria below should be considered to ensure the best actuator for the application.

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