Single Acting Pneumatic Actuator , 3 Position Pneumatic Rotary Actuator 0° 90° & 45°

3-position (90° rotation) 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 controlling a sequence of air supplies to the actuator is required as described below:
when ordering 3-position pneumatic actuators, add “3p” 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 achieved 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.

Features

Consistently operates in challenging environments, hostile environments, and when power is challenged
Modular design improves efficiency reduces wear extends life
Patented Tension-Lok™ device positively locks the spring module to allow its safe removal and installation, eliminating accidental release of the spring force
PED 97/23/EC compliant to meet the stringent requirements of pressure mounting vessels
Meets both IP66 and IP67M specifications for submergence and high pressure water deluge test and offers superior water ingress and corrosion protection
Offers multiple configurations, with a modular design that enables safe field maintenance and reduced inventory costs
Interchangeable power and spring modules for quick reversal of the fail-safe mode
Suitable for use in demanding applications requiring SIL environment