3-POSITION 4th GENERATION ACTUATORS (90° Rotation) - Air Torque - #1

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Head office and Works: AIR TORQUE S.P.A. Via Palazzo 24061 Albano S.A. (BG) Italy Tel.: +39 035 582277 - Fax: +39 035 580164 E-mail: info@airtorque.it Internet: www.airtorque.it 3-POSITION 4th GENERATION ACTUATORS (90° Rotation) AIR TORQUE 3 position pneumatic actuators provide an operation of 0°- 45°- 90°. The intermediate position is achieved by an external mechanical stop of movement on the 2 auxiliary pistons (for spring return actuators it may be only one auxiliary piston). This intermediate stop position is adjustable from 0° to 90°, for example 5°, 20°, 30° 50°, 75° etc. The intermediate position is easily achieved by adjusting the external nuts located outside the two end-caps. Both type, double acting and spring return, are available. Field of application: For dosing, for exact filling and for any kind of services where on 90° rotation an intermediate stop position is desired. In order to control the operation of AIR TORQUE 3-position pneumatic actuators a system of solenoid valves contolling a sequence of air supplies to the actuator is required as described below: When ordering 3-Position pneumatic actuators, add “3P” ( Ex. 3P AT 300 D A F07 17 ) to the normal actuator code and specify the desired stop position including the intermediate e.g. 0° - 45° - 90°. Position 1 (Intermediate Position): This position is achivied when air is supplied simultaneously to ports 2 and D whit exhaust air at ports 4 and C. In fact the air supplied at ports D forces the auxiliary pistons to the center and the rods serve as mechanical stops for the internal pistons stopping in the desired intermediate position. Position 2 (Fully Open Position): This position is achieved when air supplied to port 2 and port C (Air to port C may also be avoided) with exhaust air at port 4. In this condition air to port 2 permits air to the internal pistons to continue the opening stroke. Position 3 (Fully closed Position): This position is achieved when air is supplied to port 4 with exhaust air at port 2.