What is a helical spline hydraulic rotary actuator?

A helical spline actuator converts hydraulic pressure into limited-angle rotation via a steep helical spline pair (piston and output shaft). The design delivers high torque density in a compact, sealed housing and maintains constant overall length over the full rotation.

Which operating pressure ranges do Eckart rotary actuators cover?

Depending on the series, our hydraulic rotary actuators operate safely from 20 to 250 bar.

Which rotation angles are available?

Standard rotation angles are 90°, 180°, 270° and 360°. Special angles above 360° are possible, up to 1440° depending on the model and configuration.

What torque ranges are available?

Series-dependent torques reach up to 250,000 Nm. The final torque depends on pressure, displacement and configuration.

Do you provide valve actuators for industrial automation?

Yes. Our HyRAV® valve actuators are compact hydraulic solutions for industrial valve automation. ATEX and SIL2/3 options are available for HyRAV variants where applicable.

Which industries typically use Eckart actuators?

Applications include mining, tunnelling, construction and heavy-duty machinery, power generation and energy facilities, industrial automation, agriculture and vehicle applications, material handling, rail and transport, and general machinery where robustness and precision are essential.

We wish you a
Merry Christmas

The management and team of Eckart GmbH wish you a joyful and peaceful Christmas season.
Thank you for the pleasant collaboration and the trust you have placed in us.
We wish you health, happiness, and success in 2026.

Eckart GmbH

Leading in hydraulic rotary and valve actuators for more than 55 years

Innovative and durable rotary solutions for the highest industrial demands.

Eckart Hydraulics develops and manufactures compact, powerful and long-lasting hydraulic actuators based on the helical spline principle. Our rotary actuators operate reliably from 20 to 250 bar, offer rotation angles of up to 1440°, and deliver torques of up to 250000 Nm.

Our actuators are used worldwide – from mining, tunnelling and heavy-duty machinery to power generation and energy facilities, industrial automation, agricultural and vehicle applications, material handling, rail and transport, and demanding environments in general machinery engineering where maximum robustness and precision are essential.

ISO 9001 & ISO 14001 certified · Made in Germany since 1969

Rotary actuator SM4
compact, robust
and efficient.

The wear resistent hydraulic rotary actuators SM4 (250 bar) facilitate a rotary and rotational movement in an extremely small installation space. Based on the SM4 we realize special designs which are tuned to your exact needs. Our engineers find your solution.

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Valve actuator HyRAV^®
according to the "helical gear" principle

The compact and concentric fitting on the valve actuator HyRAV has proven to be effective in practice and the unit is both: space-saving and reliable. This series can be deployed in the most difficult conditions, from heavy vibrations to adverse ambient conditions, and offer a powerful and safe solution for valve control.

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