Sun Yeh Mechanical Spring Return Failsafe Actuators
A global brand of quality electric actuators from 50Nm to 260Nm
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S Series of quarter turn Failsafe electric actuator series
Sun Yeh offer the S series mechanical spring return electric actuator. Rather than offering the standard / typical battery spring return system, Sun Yeh have opted to offer the mechanical spring return actuator which can be normally open or normally closed. The S series is also available as modulating failsafe and also has ATEX approval.
In additional to the normal
function, these actuators are designed to provide fail-safe positioning of
valves and dampers upon loss of supply voltage. 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. A mechanical BUFFER employed at the
end of the spring stroke for two-position control units to reduce the dynamic
effects of the spring return system.
A clutchless, leverless manual override
design provides full-time manual positioning of the controlled device. The
design has already won the new patent in Taiwan, U.S.A., Japan and China
For the first time we are now pricing the full range of Sun Yeh S Series failsafe electric actuators online for purchase. Make your selection from the models shown below. See Accessories tab within product page for pricing on additional features such as ATEX approval and modulating controller.
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Please click on the product code for discounts, datasheets and more information:
Stock: 
= Available for next day delivery
= Available on 2-3 day delivery
= Factory lead time typically 7-10 days from your order.
General Note:
Please place your order by selecting the product listed above, this will show any discounts available whilst also showing you additional information including technical specifications and datasheets. From this screen you can add to basket also. Note that some products will be box quantities, this should be clearly shown on screen. If there is no box quantities stated, then all items are individually listed and priced. If the item you are interested is not showing as 'In Stock', please do contact us to check the best availability or allow us to offer an alternative/ like for like product. Products showing as '2-3 Days' might actually be available next day, please check with us before leaving the site. Goods showing as factory lead time or '7-10 Days' are typically from our European stocks and can often be made available on a shorter lead time for urgent requirements.
The Valve Actuation Specialists
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