Specifications 180 Spring Return Actuator
90 Fail Safety Position
Air Fail Operation
180° Spring Return Actuator 4thG With 90° Fail Safety Position The 180° spring return actuator 4th Generation with 90° fail safety position is used for 0°-90°-180° operations where in case of air failure the actuator has to return to the 90° position.At both ends of the actuator a spring set is mounted and the compression on both sides of the springs is caused by the rotation from the 90° position.The fail-safe operation is achieved by the extension of the compressed springs that bring the actuator from 0° to 180° position to 90° position.The external travel stop is available as a standard in fully open position (180°) and in fully close position (0°),and it is easily and precisely adjustable of +/- 4° in both directions.
In order to control the operation of AIR TORQUE 180° with 90° Fail Safety Position a system of solenoid valves contrilling a sequence od air aupplied to the actuator is required as described besides: The actuator may be controlled by two 3/2 way solenoid valve by one 5/3 way solenoid valve.
From 90° to 180° When compressed air is suppkied at the Port 2,air forces the pistons apart and compresses the springs from their inside ends to the side.A counter-clockwise rotation is obtained.
From 90° to 0° When compressed air is supplied at the Port 4,air forces the pistons together and compresses the springs from their outside ends to the center.A clockwise rotation is obtained.
Air fail oprtations From 180° position: on loss of air pressure (air or electric failure) at Port 2 allows the springs to force the pistons together (until 90° position) with the exhaust air exiting at Port 2,a clockwise rotation is achieved. From 0° position: on loss of air pressure (air or electric failure) at Port 4 allows the springs to force the pistons toward the actuator (until 90° position) with the exhaust air exiting at Port 4,a counter-clockwise rotation is achieved.
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