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Hydraulic Valve Actuator

Available as double-acting or spring return in 12 drive sizes with torque up to 250,000 Nm at 210 bar. Rotation of 0-90º, 120º, or 180º+. Operating times from 0.5 to 200 seconds and fail-safe response as fast as 0.1 secs. Well suited for extreme operating conditions such as high vibrations or marine/offshore environments.

Silver painted Eckart HyRAV Flex hydraulic valve actuator. double acting and single acting hyrav valve actuator by eckart

Valve Actuator Specs

12 drive sizes. Torque up to 250,000 Nm. Quarter-turn actuation.

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What Makes Us Different?

Quarter-turn actuation

Specifically built for automating valves in industrial environments with rotation options of 0-90º, 120º, and 180º+

Helical Spline Rotary Actuator Mechanism

Use in extreme conditions

Good performance in applications with heavy vibrations or severe environments due to their compact helical spline design

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On-demand experts

Local, responsive engineers for your inquiries to ensure fast lead times, as well as post-sale support

Product Guide

Valve Actuator 101

Applications

Side view Blue painted Eckart HyRAV Flex hydraulic valve actuator installed.

Valve Actuator 101

What are valve actuators?

Valve actuators mount on valves and move valves to a desired position by utilizing liquid, electric or some other power source.

How are valve actuators used?

Although the most common and important use of a valve actuator is to open and close valves, current actuator designs go far beyond the basic open and close function. The valve actuator can be packaged together with position sensing equipment, torque sensing, motor protection, logic control and digital communication capacity all in a compact, protected enclosure.

Valve Actuator Benefits

12 drive size options
Torque up to 250,000 Nm at 210 bar
Slim, compact body with small dimensions
Smallest footprint to torque ratio in the Eckart product line
Virtually maintenance free, no lubrication required
High repeatability with very simple control of the flow rates
Extremely trip possible (e.g. 90° in 0.2 sec.)
Robust and durable in extreme applications, including vibration and environments

Product Guide

Valve Actuator 101

Applications

Applications and Solutions

Valve actuators are used across a wide range of industries for their quarter-turn actuation, including marine & offshore, mining, construction, and industrial.

Gate Actuation

Hydraulic valve actuators were originally designed for automating valves in demanding industrial applications. Today, this is still one of their most common use cases. This includes the actuation of heavy gates. Their quarter-turn design makes them especially suited for this movement, as well as their footprint to torque ratio. This allows them to fit into smaller space-constrained applications while still being able to open and close large metal gates and doors on industrial machinery.

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Frequently Asked Questions

The HyRAV SG is our standard model, while the HyRAV Flex is our customizable model.

If your application requirements fit within the specifications of the HyRAV SG, this valve actuator will be the right solution for you. This often includes standard industrial applications. If your application has specific requirements outside of these confines, however, the Flex model offers maximum performance and flexibility. Some customization options include high torque reserves, flexible interfaces, control boxes, valve blocks, and application-specific engineering for installation conditions, environments, or valve requirements.

The right choice between double-acting or single-acting spring return comes down to two application factors: the required fail-safe function and the switching frequency.

A double-acting actuator is recommended when your application includes high switching frequencies, precise positioning, or high torque in both directions, as hydraulic pressure is used both when the valve opens and closes, hence the term double-acting. This means the force is consistent, quick, and rigid throughout the entire range of motion. These are typically seen in industrial automation, control valves, and whenever the valve must maintain its position in the event of a pressure loss.

A single-acting actuator with spring return is recommended whenever safety is a concern. When a defined safety position (either fail-safe closed or fail-safe open) is required in the event of a failure, this model is the better option. The spring return allows the actuator to revert to its defined position without an external energy source. These are typically seen as emergency shut-off valves and in chemical processing plants and water treatment facilities.

The maximum operating pressure of the HyRAV valve actuator is 210 bar (3,045 psi). It is capable of torque up to 250,000 Nm (2,210,000 in-lbs) at this operating pressure.

Yes. The HyRAV valve actuators are suited for a wide variety of applications with extreme conditions. This includes explosive environments, submersible applications, temperatures from -25°C to +70°C (-13ºF to 158ºF), saltwater conditions, heavy vibrations, and more.

The HyRAV carries the following:

IP68 protection rating
ATEX certification for use in potentially explosive atmospheres
SIL2/3 certification for functional safety applications

The HyRAV valve actuator uses the EN ISO 5211 standard flange, so that the actuator can be used in standard configurations or in place of most manufacturers’ actuators without custom adapter plates.

The HyRAV double-acting cylinders are rated for over 100,000 operations.

The concentric design transmits torque coaxially to the valve stem, which means no radial loads. This reduces mechanical stress on the valve, helps minimize maintenance requirements, and supports a long service life.

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