In oil and gas, petrochemical processing, and gas compressor stations, a sudden power failure requires immediate emergency response.
Standard electric actuators typically stop in position upon loss of power. However, in critical applications, leaving a valve open or closed can cause system overpressure, pipeline leakage, or equipment damage. These systems demand an automatic return to a pre-determined safe position (Fail-Open or Fail-Closed) without relying on back-up electrical power.
Spring return electric actuators address this safety requirement. They store mechanical energy in internal springs during standard operation. When power cuts out, this mechanical energy automatically drives the valve to its designated safe position, functioning as a reliable emergency shutdown (ESD) mechanism.
Key Criteria for Selecting a Fail-Safe Actuator:
Fail Position Configuration: Definition of Fail-Open or Fail-Closed based on process safety.
Valve Mechanical Data: Matching actuator output to valve type, torque requirements, and rotation angle.
Compliance & Certifications: Hazardous area classifications (ATEX/CNEX) and SIL safety ratings.
Operational Control: Utilizing manual override for local positioning during commissioning and site maintenance.
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