5
Figure 1: Installation dimensions PSQ-E100 and PSQ-E150
4.1 Installation position
Figure 2: 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.
5. Function
The electric quarter-turn actuators Series PSQ 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. Optionally, torque switches can be installed for each
direction. The handwheel does allow comfortable manual operation in case of power failure or for
commissioning. The handwheel is idle when the motor is operating the actuator, but engaged in any
position without clutching or declutching.
