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Electrothermic actuators designed for reliability
Published: October 2004
The design of a new series of electrothermic actuators for the automatic on/off control of valves on radiators, fan-coil units and manifolds is based on an analysis of the failure mode of similar products. 22C actuators consist of only a few components, and they are made using modern techniques to produce an overall robust design and reliable performance. They are available from Watts Martin Orgee. A wax thermostatic element is activated by a thermistor with a positive temperature coefficient responding to a signal sent by a room thermostat or timing thermostat. The reinforced resin of the base provides a strong structure for the valve fitting area, and self lubrication of the mobile support creates minimal friction. There are four versions of these actuators: normally closed; normally open, standard 2-wire; and 4-wire with auxiliary contact for additional commands. They are all available for 230 and 24 V operation. A transparent window on the cover enables the status of the actuator to be visually checked. www.martinorgee.co.uk Related articles: 
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