AUMA SQ Part-Turn Actuator (Ball / Butterfly Valves)

Overview: The Standard for Quarter-Turn Valve Automation

The AUMA SQ Part-Turn Actuator is an electric quarter-turn actuator engineered for the automation of butterfly valves and ball valves, transmitting torque to the valve for less than one full revolution as defined by ISO 22153. Unlike multi-turn actuators, part-turn units like the SQ do not need to withstand operational thrust, allowing a more compact, purpose-built design optimized for the rotational swing angles – typically 75° to 105° – that quarter-turn valves require.

As an authorized supplier of AUMA valve actuators, Seven Star LLC sources and supplies the SQ part-turn actuator to refineries, water treatment facilities, and process industries across Oman and the wider GCC. Because SQ actuators serve as the workhorse automation solution for ball and butterfly valves across countless applications, Seven Star LLC helps engineering and procurement teams specify the correct size and configuration for their valve automation project.

Working Principle: Precision Quarter-Turn Actuation

The SQ actuator drives a valve stem through its rotational swing angle using an electric motor coupled through a gear train, with internal end stops allowing precise, repeatable approaching of the fully open and fully closed positions during both motorized and handwheel manual operation. This internal end-stop design is a deliberate engineering choice for part-turn service: because butterfly and ball valves rotate through a defined arc rather than traveling linearly along a threaded stem, the actuator’s own mechanical limits – rather than the valve’s seating torque alone – can define accurate end-of-travel positioning.

SQ actuators are rated for open-close duty and positioning duty (ISO 22153 Classes A and B), corresponding to short-time duty S2-15 min, making them suited to on/off isolation service and occasional intermediate positioning rather than continuous modulating control – the modulating-duty counterpart within the same platform is the SQR range. A mechanical position indicator provides local visual confirmation of valve position at the actuator itself, independent of any remote signaling.

Engineering Design of the SQ Actuator

The SQ actuator is built to IP68 protection standard with output flange dimensions conforming to ISO 5211, ensuring straightforward mechanical compatibility with butterfly and ball valves manufactured to the same international standard. Three-phase and single-phase AC motor options are available, with the actuator covering a torque range of approximately 50 to 2,500 Nm and rotation angles from 75° to 105° to accommodate the range of quarter-turn valve designs in common industrial use.

A handwheel is fitted as standard for manual operation, supporting commissioning, maintenance, and emergency positioning without requiring electrical power. High enclosure protection and high-quality corrosion protection support reliable operation across wide ambient temperature ranges, from -30°C to +70°C as standard, and the SQ can be combined with a range of AUMA actuator controls – from simple OPEN-CLOSE control through micro-controlled versions with operating data logging or fieldbus interface – to match project control architecture requirements.

Key Features

The AUMA SQ Part-Turn Actuator delivers dependable, ISO-compatible quarter-turn valve automation. Key characteristics include:

• ISO 5211 output flange for direct mechanical compatibility with standard butterfly and ball valves.
• Torque range from approximately 50 Nm to 2,500 Nm across the model range.
• Rotation angle from 75° to 105° to suit common quarter-turn valve designs.
• IP68 protection class with high-quality corrosion protection.
• Handwheel for manual operation and mechanical position indicator for local visual confirmation.
• Compatible with a range of AUMA actuator controls, from simple OPEN-CLOSE to fieldbus-integrated versions.
• Operating time range from approximately 4 to 100 seconds for a 90° travel.

Industrial Applications

The SQ actuator is deployed across water and wastewater treatment plants, refineries, power generation facilities, and general process industries wherever butterfly or ball valves require reliable open-close or positioning automation. Its ISO 5211 compatibility and broad torque range make it a versatile specification choice across pipeline isolation duty, HVAC and utility systems, and process valve automation projects of varying scale.

Seven Star LLC supports water authorities, refinery engineering teams, and EPC contractors across Oman, Muscat, Sohar, and the broader GCC region with sourcing of AUMA SQ part-turn actuators, helping projects standardize on a proven, widely serviceable valve automation platform.

Technical Specifications

The table below summarizes the core specifications of the AUMA SQ Part-Turn Actuator as supplied by Seven Star LLC.

Call To Action

Seven Star LLC supplies the AUMA SQ part-turn actuator with full manufacturer documentation and regional technical support. Contact our instrumentation and valve automation division for a formal RFQ, to confirm the correct actuator size for your ball or butterfly valve, or to obtain the complete technical datasheet for project specification. Seven Star LLC ensures every unit shipped across Oman and the GCC is genuine, correctly configured, and backed by local engineering support.