Valve actuators gain failsafe options

Edited by the Engineeringtalk editorial team May 17, 2005

Market-leading Rotork IQT intelligent direct drive actuators for quarter-turn valves are now available with failsafe options, enabling valve operation during mains power failure.

Market-leading Rotork IQT intelligent direct drive actuators for quarter-turn valves are now available with failsafe options, enabling valve operation during mains power failure.

Two types of IQTFS failsafe actuators are available.

For hazardous and nonhazardous locations the Type 1 external failsafe version is designed to be connected to an external 24V DC independent power source.

On loss of mains power the actuator automatically switches over to the failsafe supply and can be controlled locally or by a hardwired remote circuit.

In nonhazardous locations only, the Type 2 battery failsafe version is equipped with an integral 24V DC battery pack, which is kept charged by the mains power under normal circumstances.

The actuator can be configured to automatically use the battery supply to open or close the valve, or stay put awaiting a local or remote command, if mains power fails.

IQTFS actuators continue to embody all the features and virtues of the standard versions, including permanent double-sealing, infra-red "nonintrusive" commissioning, onboard data logger, rationalised "system on a chip" intelligence, comprehensive control flexibility and operation by three phase, single phase or DC supplies.

Full details can be found in Rotork publication E116E.