Explosion-proof Spring Return Fail-Safe Electric Actuators / SE Series

Product Overview

Sun Yeh explosion-proof spring return fail-safe quarter-turn electric actuators, in addition to normal function (two-position control, floating control, and 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 a two-position type actuator, a mechanical BUFFER is employed at the end of the spring stroke to reduce the dynamic effects of the spring return system. Our explosion-proof electric actuators can choose the clutch-less and lever-less manual override for standard units to provide full-time manual positioning of the controlled device.

The SE series explosion-proof electric actuator is structured as flame-proof and combustible dust-proof. The directive and standards marking is II 2GD 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 groups T1 to T4.