AUMA LE Linear Thrust Actuator (Sliding-Stem)

Overview: Converting Rotary Drive into Linear Thrust

The AUMA LE Linear Thrust Actuator is a linear thrust unit that, combined with an AUMA SA multi-turn actuator, forms a complete electric linear actuator for automating sliding-stem valves such as globe valves and gate valves. According to ISO 22153, a linear actuator is defined as an actuator which transmits thrust to the valve for a defined linear stroke – a fundamentally different mechanical task from the rotational output of multi-turn or part-turn actuators, which the LE unit is specifically engineered to provide.

As an authorized supplier of AUMA valve actuators, Seven Star LLC sources and supplies the LE linear thrust actuator combination to refineries, power plants, and process industries across Oman and the wider GCC. Because globe valve automation requires precise linear positioning rather than rotational drive, Seven Star LLC helps engineering teams specify the correct SA/LE combination for their sliding-stem valve application.

Working Principle: Rotary-to-Linear Thrust Conversion

The LE linear thrust unit mounts between an AUMA SA multi-turn actuator and the valve stem, converting the SA actuator’s rotational output into the linear thrust and stroke motion that globe and gate valves require to open and close. Internally, the unit’s mechanism translates the multi-turn actuator’s rotary motion into precise axial displacement, delivering thrust forces ranging from 4 kN up to 217 kN and strokes of up to 500 mm depending on the selected combination size, at linear speeds from 20 to 360 mm/min.

Because the linear thrust unit is paired with a separately selected SA actuator, the overall linear actuator inherits the SA range’s duty rating options: SA units for open-close and positioning duty (Classes A and B, short-time duty S2-15 min, with S2-30 min available for longer running), or SAR units for modulating duty (Class C, S4-25%, with S4-50% and S5-25% special versions). This modularity allows a single linear thrust unit platform to serve both simple on-off isolation valves and continuously modulating control valves.

Engineering Design of the LE Linear Thrust Unit

The LE unit is engineered for direct combination with the SA multi-turn actuator family, and where a lever arrangement must be operated instead of a straight sliding stem, the LE unit can alternatively be mounted onto a base to accommodate that mechanical configuration. This flexibility allows the same core linear thrust technology to serve both straightforward globe valve automation and more complex lever-actuated valve geometries.

The combined SA/LE actuator supports the full range of AUMA actuator controls, from simple OPEN-CLOSE control through micro-controlled versions with operating data logging or fieldbus interface, giving specifiers the same control architecture flexibility available across AUMA’s broader actuator portfolio.

Key Features

The AUMA LE Linear Thrust Actuator delivers precise linear positioning for sliding-stem valve automation. Key characteristics include:

• Thrust range from 4 kN to 217 kN across the combination size range.
• Strokes up to 500 mm to accommodate a wide range of globe and gate valve travel requirements.
• Linear speeds from 20 to 360 mm/min.
• Compatible with SA (open-close/positioning) or SAR (modulating) multi-turn actuators.
• Can be mounted on a base for lever-arrangement applications instead of direct sliding-stem drive.
• Compatible with the full range of AUMA actuator controls, from simple OPEN-CLOSE to fieldbus-integrated versions.

Industrial Applications

The LE linear thrust actuator combination is deployed wherever globe valves, gate valves, or lever-actuated valves require precise linear automation, including refinery process units, power plant feedwater and steam systems, and industrial process lines where sliding-stem valve technology is specified for its throttling and shut-off characteristics. Its wide thrust and stroke range make it suitable for both small control valves and large main isolation valves.

Seven Star LLC supports refinery engineering teams, power plant maintenance departments, and EPC contractors across Oman, Muscat, Sohar, and the broader GCC region with sourcing of AUMA LE linear thrust actuators, helping projects automate sliding-stem valves reliably.

Technical Specifications

The table below summarizes the core specifications of the AUMA LE Linear Thrust Actuator combination as supplied by Seven Star LLC.

Call To Action

Seven Star LLC supplies the AUMA LE linear thrust actuator combination with full manufacturer documentation and regional technical support. Contact our instrumentation and valve automation division for a formal RFQ, to confirm the correct thrust and stroke combination for your globe or gate valve, or to obtain the complete technical datasheet. Seven Star LLC ensures every unit shipped across Oman and the GCC is genuine, correctly configured, and backed by local engineering support.