STK Actuators

90° rotary actuator – for ball valves and butterfly valves

The double-acting actuators of the STK range were developed for extreme operating conditions and are characterized by their long service life and flexibility. Increase your process reliability with hydraulic or electrical process monitoring, or use these actuators as the basis for our electro-hydraulic power packs.

  • Torque of up to 50,000 Nm
  • Maximum operating pressure of 150 bar
  • Rotary angle of 90 – 100° depending on manufactured size
  • With mechanical adjustable stops
  • Connecting dimensions according to DIN ISO 5211

Special Features

  • With mechanical, hydraulic or electronic position indication
  • With mechanical or hydraulic emergency operation equipment
  • With modular hydraulic control devices
  • Submerged upon request
  • Constant torque over the entire swivel angle
  • Compact and completely enclosed design
  • Space-saving direct mounting possible due to hollow shaft and flange connection
  • SIL 2 Functional safety according to IEC 61508


  • Small size – high torque
  • Lower servicing and maintenance costs
  • Small amount of oil
  • Low noise
  • Bronze housing, optional
ex 2


 – not available – 

Call us now at +49 2324/398-716 or send us an e-mail with your inquiry at