Description :

Sun Yeh explosion-proof electric spring return fail-safe actuators, in addition to normal function (floating control, two-position control, modulating control) are designed to provide fail-safe positioning of valves and dampers upon loss of voltage supply. A mechanical spring set is utilized to position the controlled device to either the fully OPEN or fully CLOSED position, without any external power source. For two-position type actuator, a mechanical BUFFER is employed at the end of the spring stroke, in order to reduce the dynamic effects of the spring return system. A clutch-less and lever-less manual override is optional for standard units to provide full-time manual positioning of the controlled device.

The SE series explosion-proof spring return fail-safe actuator is structured as flame-proof and combustible dust-proof. The directive and standards marking is II2GD Ex db IIB T4 Gb, Ex tb IIIC T130°C Db. where it is classified as Zone 1 or Zone 2, containing Group IIA and Group IIB gases, Zone 21 or Zone 22, containing the combustible dust atmosphere or a mixture of explosive gas atmospheres and combustible dust atmospheres. Temperature group T1 to T4.

Specification :

• Available supply voltages: 24VAC, 24VDC, 110VAC, 120VAC, 220VAC, 240VAC, 220V / 3PH, 240V / 3PH, 380V / 3PH, 440V / 3PH.
• Dry powder coated aluminum alloy housings.
• Standard 50% duty cycle (In accordance with IEC standard).
• Continuous mechanical position indicator.
• 2 limit switches for operation, fail clockwise spring return and On / Off control are provided as standard.
• Relative humidity: 30 to 95%
• Ambient temperature: -30°C to +70°C (-22°F ~ +158°F)

Features :

● Enclosure conforms to IP68 (7 m / 72 hrs) with explosion protection.
● Controls: On / Off, floating (optional), modulating (optional).
● Clutch-less manual override (optional).
● ISO 5211 mounting flange.
● Built-in motor thermal protection.

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  Explosion-proof Quarter-turn Electric Valve Actuator