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AUMA launches explosion-proof variable speed actuators

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Electric actuator manufacturer AUMA has launched explosion-proof variable speed valve actuators for use in potentially hazardous environment. The new SAVEx actuators for open-close duty and SARVEx multi-turn actuators for modulating duty, combined with intelligent ACVEx actuator controls, provide full control of the motor speed at any time.

In oil and gas applications, variable speed offers significant advantages for challenging valve control tasks, since it allows the optimum operating speed to be selected for each change of valve position. High positioning accuracy and optimised setpoint control considerably increase the effectiveness of pressure control valves in gas pipelines, for example. On multiport valves, variable speed actuators aid rapid and accurate switch-over between ports.

Mechanical stresses on valve, actuator and pipeline are minimized by reducing the operating speed close to the end positions, allowing the moving element of the valve to make gentle contact with the seat. Pressure surges and cavitation effects in the pipeline can be avoided by using speed profiles.

When working in modulating duty, the actuator speed can be set to reduce progressively as the valve position approaches the setpoint, giving a significant increase in positioning accuracy.

Actuator speed can also be controlled by an external signal – either 4–20 mA analog or 0–100 % digital – to take full advantage of additional control variables or algorithms. A further option is speed synchronisation between two actuators.

AUMA’s new explosion-proof SAVEx and SARVEx actuators complement the weatherproof SAV and SARV type range. They are available in six sizes covering torques up to 1,000 Nm. Speed ranges include 6–60 rpm, 12–108 rpm and 24–116 rpm.

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Actuator

Airpower actuators for high temperatures

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Nowadays actuators, either pneumatic or electric, are being used for widespread industrial applications anywhere from food, paper, automobile, or paint etc. But what most people are not aware of is the use of actuators for things that we use also on a day-to-day basis such as road tunnels, railway tunnels and metro networks.

In an emergency situation such a fire inside rail or road tunnels, or even underground passenger platforms, actuator- operated dampers in the ventilation system can act to clear smoke from the structure as well as to suppress spreading of the fire. Most actuators that operate these dampers are required to be “failsafe”. They are equipped with mechanical springs that open (or close) the damper upon sudden loss of power. These spring return actuators automating dampers must also be able to work under extreme temperatures However, these actuators require a more specific design since they need to withstand outstanding situations. Combined with dampers actuators are being used for ventilation and smoke extraction systems, which is crucial for such highly dangerous situations like a tunnel fire. To ensure the continuous operation, even in highly critical conditions, airpower single acting type pneumatic actuators are equipped with material, springs, and special O-rings that ensure the continuous operation when tunnel is under fire for 2-2.5 hours at temperatures up to 250°C. 

For this purpose, airpower actuators are being tested in annealing furnaces at the ambient temperature of 250°C for 2.5 hours. Enduring such critical temperatures require special O-rings, springs, special grease, which are part of the design of airpower pneumatic actuators. Target is to switch several times after being removed from the furnace. Venting is being prevented through throttle valves. 

Result of such test is fully satisfactory as the actuator functions 100% despite the high temperatures of 250°C and the long duration of 2.5 hours. Immediately after the heat test the actuator is subject to a one cycle functional test. The springs are fully functional, and the spring cover is intact. Thus, providing extra safety for critical applications such as ventilation and smoke exhaustion where dampers are being used in tunnels, metro networks or railway tunnels. 

Pneumatic Actuator Specification
Temperature range
Normal operation (no fire): -10°C to +85°C
Tunnel application (under fire for 2 hours minimum): -20°C to 250°C 

For further information please contact Mr. Murat Erol at m.erol@airpower-gmbh.com

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As cunning as a fox: AUMA’s new smart actuators

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What do a fox and an electric valve actuator have in common? A lot, if the actuator in question is AUMA’s brand-new PROFOX. Like its namesake, PROFOX is not only cunning and adaptable but also extremely hardy.

AUMA’s more than 50 years of experience developing and manufacturing electric actuators has yielded a high-performance actuator series with exciting new features and an excellent cost-benefit ratio. Aimed at applications requiring fast and precise positioning, utmost flexibility and future-proof interfaces, the smart and compact PROFOX series is suitable for all industry sectors, including water treatment, combined heat and power plants, process industries, and shipbuilding.

Cunning

Built-in intelligence makes PROFOX equally suited to both simple open-close duty and challenging modulating applications. Motor speed is adjustable, ensuring fast and precise positioning without overrun. Soft start and soft stop functionality increases valve lifetime. Operating costs are low, thanks to high mechanical efficiency and low standby consumption. Innovative diagnostics ensure long-term availability and future-proof PROFOX actuators for IIoT applications.

Adaptable

AUMA PROFOX actuators work with gate, butterfly, ball and globe valves. There are multi-turn versions for torques of 10 – 100 Nm and part-turn versions delivering 32 – 600 Nm. A linear actuator will follow soon. Modular design ensures flexible configuration, rapid delivery and consistent operation. Host system integration is equally flexible; PROFOX actuators support the most common communication protocols and are well prepared for future evolutions. Compact design allows PROFOX actuators to fit tight spaces.

Hardy

The PROFOX series is engineered and built in Germany – and designed to last, even under the toughest process conditions. High-quality metal housing with IP67 protection (IP68 optional) and AUMA’s unique corrosion protection, which meets the highest C5-M/C5-I requirements of EN ISO 12944-6, ensure that PROFOX actuators have a long life at temperatures from –30 °C to +70 °C.

PROFOX actuators are simple and easy to use. Installation and commissioning are fast and convenient, using either the integral pushbuttons or an intuitive app. The FOX-EYE indicator light and a position indicator on the housing clearly show the actuator status at any time, even from a distance.

“The new PROFOX actuator series is set to lead the market thanks to its unique combination of features,” says AUMA product manager Christoph Edelmann. “It offers unprecedented intelligence, precision, efficiency and flexibility at a very attractive price.”

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AUMA Service offers Live Video Support

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AUMA Service has reacted to the coronavirus crisis by adding Live Video Support to its service portfolio.

“AUMA actuators are often installed in critical infrastructure,” says Thomas Knecht, Director Global Service at AUMA. “So it is very important that, even in times of crisis, AUMA Service can continue to help our customers quickly and directly to ensure failure-free operation of their plants.”

“We have occasionally used video assistance in the past, and it has proved to be very successful. Many questions or problems can be solved remotely via video, without a service technician having to go on site. To protect both our customers’ and our staff’s health and to help impede further spread of the virus we are now offering this service worldwide.”

If customers have questions about the AUMA actuators in their plant, an experienced AUMA service expert can use a videoconferencing service to connect with them on their smartphone or tablet. Via video, the service expert can then get a good idea of the situation, assist the customer with troubleshooting, and take any necessary action such as ordering spare parts.

This service is available worldwide, through our comprehensive global AUMA service network.

How to request Live Video Support

You can request this new service simply by contacting your local service office or sending an email to service@auma.com.

For fast processing of your request, please include your contact details, the actuator serial number and a short fault description.

You can also request Live Video Support via the AUMA Cloud. In this case you can attach important device data directly to the service request, allowing our service experts to get to work even faster. The video will provide you with detailed instructions.

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