4.1 Installation position
Outdoor usage
When using actuators in environments with high temperature
fluctuations or high humidity, we suggest a heating resistor to be
fitted to prevent the build-up of condensation within the enclosure.
Figure 2: Installation position
5. Function
The electric quarter-turn actuators series PSQx03 are designed to operate valves with 90° motion. The PSQ actuators
are provided with a mechanical interface according to ISO 5211 for valve mounting. The motor torque is transmitted
via a spur gear onto the sun wheel of a „Wolfrom“-gear. The rotating output wheel of the „Wolfrom“-gear holds a
removable drive bush to connect the actuator with the valve stem. Two adjustable position switches are limiting the
electrical motion in both directions by interrupting the motor current or control circuit when reaching the adjusted
position.
The 90° motion is mechanically adjustable by +/- 5° by means of two stop screws. Torque switches are installed for
each direction (at PSQ103 and bigger).
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