| Pneumatic Actuator
 
Double Acting Actuator (DA) ISO 5211
Principle of Operation
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 the operation, air from the outer chambers is exhausted through Port 'B'. Clockwise output operation is achieved by reverse of the above and inserting pressure into Port 'B
Single Acting Spring Return
Principle of Operation
Pressure applied to Port 'A', will cause the inner chamber to be pressurised, forcing the pistons outward to compress the springs.
The pinion is rotated counter counteil clockwise. Upon release of pressure through port "A" the springs will exert pressure to close the pistons and rotate the pinion clockwise rapidly.
This action will often be use to close a 90° turn valve in shutdown mode.
SPECIFICATIONS
Pressure range
2 bar (29 psig) to 8 bar (116 psig) double acting
3 bar (44 psig) to 8 bar (116 psig) spring return
max.working pressure 10 bar (145 psig).
Media : filtered dry-or lubricated air. For non corrosive gas water or light hydraulic oil please check with the technical department.
Temperature range : STD -20ºC (-4ºF) a + 80ºC (175ºF)
+20ºC (+68ºF) a +150ºC (302ºF)
on request -50ºC(-58ºF) a +100ºC (21ºF).
Rotation : counterclockwise when Port 'A' is pressurized; clockwise when PORT'B' is pressurized and for spring return actuators.
Stroks : 90º with standard adjustment +3º or -3º.
Lubrication : all moving parts are factory lubricated for cycle life of the actuator.
Constructions : suitable for indoor and outdoor installation.
Connections : bottom drilling to match valve is in accordance with ISO 5211/DIN 3337 Interface for solenoid valve, shaft top end and top drilling to assemble accessories are in accordance with VDI/VDE 3845, NAMUR.
Inspection : each unit is hydraulically tested and certified and guaranteed for a minimum of 500.000 moves.
 Double Acting  Single Acting Spring Return
 with Pneumatic Positioner  with Disengageable Manual Overide
 with NAMUR micro switches which are contained in IP 65 waterproof box
 with NAMUR solenoid valve
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