Hytork Air Fail Safe Actuator

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Hytork Air Fail Safe Actuator
Posting date : Dec 03, 2014
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Free Member Scince Jul 30, 2013
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Leo Zhang
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85-
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Detailed Description
The Hytork Air Fail Safe Actuator is for larger valves with higher torque requirements, requiring reliable fail safe operation utilising a unique in-built air reservoir giving fail safe action without the torque losses inherent of spring designs. For torque requirement valves up to 28500 inch.lbs (3220 Nm.) The AFS (Air Fail Safe) actuator is designed to provide a high fail stroke torque in a double rack and pinion actuator that cannot be achieved using springs. All the safety and performance features of double rack and pinion actuators are maintained as is the Hytork XL reliability.The HYTORK AFS maintains the highest seen air supply pressure within the chamber modules, to be released upon control demand. This design also prevents closure "creeping" when air supply pressures drop, which occurs with all spring return designs. Torque output is constant in the powered stroke with only a small drop off on the fail stoke. The available torques are proportional to the air supply pressure. Spring changes for various air supply pressures need not be made.The AFS operates as a double acting actuator in both directions until there is a loss of supply pressure. When this loss occurs, the compressed air stored in the chambers powers the actuator to close the valve. This makes the AFS Series suitable for use in ON/OFF and MODULATING CONTROL situations while still providing the fail safe requirement. The AFS is supplied already furnished with an installed, direct mount solenoid valve. The coil type is selected to suit your site requirements. This saves on site piping and ensures the assembly has been fully tested. At the same time, we still can offer the items as below: Hytork XLW Series Water Operated Valve Actuator Hytork XL "Commando" Valve Actuator Hytork Excel (XL) Series of Valve Actuator

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