In hazardous areas containing flammable and explosive gases, such as petroleum and fine chemical plants, the continuity and safety of fluid networks are critical. If a sudden power outage occurs and quarter-turn valves cannot cut off or conduct fluid in time, it can easily lead to medium leakage or explosive accidents.
To build a robust backup safety defense for severe working conditions, industrial equipment selection must strictly evaluate the fail-safe return capability of the electric actuator.
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Internal Energy Storage: An excellent fail-safe return system must put all components inside the actuator body to keep the characteristic of compact structure and small dimension. Energy storage solutions typically utilize a super-capacitor or battery.
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Preset Safety Position: The system must be capable of automatically driving the valve to a preset safety position (full-close position, full-open position, or current position) when the external power supply is abnormally disconnected.
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Electromagnetic Interference Resistance: Due to the complex electromagnetic environment on-site, selection standards must include a strong surge protection circuit to resist 1kV lightning surge waveforms and a 4kV anti-EFT interface circuit, ensuring the actuator will not be burned when used outdoor and operates without interference.
As a professional electric actuator manufacturer, Dynamic Corporation Limited (DCL) provides highly integrated fail-safe return drive solutions for explosion-proof industrial environments.
The Dynamic (DCL) explosion-proof series actuators have obtained authoritative international certifications, including ATEX/IECEx (Ex db h IIC T4 Gb / Ex h tb IIIC T135°C Db) and CSA (Class I, Division 1, Groups C and D T5/T6). During normal external power supply, the internal control circuit charges the super-capacitor or battery to store energy. Upon power failure, it seamlessly switches to the internal power supply, providing a full stroke drive capability of $\ge4$ times. When the external power supply is restored, the actuator automatically exits the fail-safe return state and goes back to normal working mode, perfectly favoring the Modbus-RTU field bus.