Mounted With Pneumatic or Electric Actuators

With Complete Installation of Actuators with S/S Mounting Bracket with Extension Shaft (Stem) with Double Acting Pneumatic Actuator with Spring Return Pneumatic Actuator with Electric Actuator (3 Phase, 240V) Worm-Gear Operation

	Double Acting Actuator (DA): Counter-clockwise output operation is achieved by inserting pressure into Port 'A', to force the pistons apart thus rotating the actuator pinion counter clockwise. During its operation, air from the outer chamber is exhausted through Port 'B'. Clockwise output operation is achieved by reverse of the above and inserting pressure into Port 'B'.
Data Required for Actuator Sizing: 1. Valve torque min. 25% Safety recommended 2. Double acting or Spring-return operation 3. Minimum available operating pressure Selection of Double Acting Actuators (DA): Determine the requirement valve torque, this should include 25% safety margin and the minimum.   Operating pressure available. Refer to the pressure/torque table and select the minimum pressure   column applicable. Follow this column down until a value not less than that required is found. Next read across to the   left hand column and read the model number to be ordered. Example: valve torque 80Nm plus 25% =100Nm, Minimum operating pressure 5 bar. By reading   down the 5-bar column afigure. Below 119Nm is 123Nm the model number therefore shown in the   left hand column is AP4DA. Remarks: the chosen torque valve, which fixes the type of actuator, has never to be lower than the requested torque of the valve.
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	Spring Return Actuators (SR): Pressure applied to Port 'A' will cause the inner chambers to be pressurized, forcing the pistons outward to compress the springs. The pinion is rotated counter-clockwise. Upon release of pressure through Port 'A' the springs will exert pressure to closed the pistons and rotate the pinion clockwise rapidly. This action will often be used to close a 90 deg. turn valve in shutdown mode.
Determine the required valve torque (this shoudl include 25% safety margin), and the minimum operating pressure available. Select from the "Spring Stroke/"0 deg." table a value that is not less than the required valve torque (including safety margin). Next refer to the pressure table and select under your min. pressure and "0 deg." torque column a figure not les than that required. (including Safety Margin) Example: Valve torque 60 Nm plus 25% = 75Nm. Checking the "Spring Stroke/"0 deg." column, it will be noted the nearest value is 108 Nm. By following the line across to the vertical 5 bar "0 deg." torque column , a figure of 109 Nm is shown therefore, the suitable actuator is AP5SR5. In a normal valve shut- down situation the actuator would operate the valve to break out a less than 108 Nm. If "0 deg." torque at operating pressure is at operating pressure is too low, continue down the column until an acceptable value is found, compare with the corresponding "Spring Stroke/"0 deg." column to ensure that this also is adequate. This model may be used.
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