AUMA SQ 07.2 Part-Turn Electric Actuator

Overview

AUMA SQ 07.2 doubles the torque capacity of the entry frame while keeping nearly everything else about the drive identical. Its tripping torque is adjustable from 100 Nm to 300 Nm, and it uses the same F05/F07 valve flange, the same 160 mm handwheel and the same operating time choices as the SQ 05.2. That combination is useful to anyone designing a valve package, because a project can specify one mounting envelope and decide late in the engineering stage whether the valve needs the 150 Nm class or the 300 Nm class.

Seven Star LLC supplies the AUMA SQ 07.2 across Oman and the GCC on request, with lead time confirmed at quotation. For tenders in Muscat, Sohar and Salalah we review the published valve torque curve, confirm that the breakaway value sits inside the 100 to 300 Nm band, and advise on controls so that the delivered actuator needs no rework at site.

Choosing the Torque Class

Picking between frame sizes is mainly a question of valve torque. A butterfly valve in a water line may need little torque in mid-travel but a much higher value at the seat, and the actuator must be sized to the higher figure. The AUMA SQ 07.2 raises the minimum tripping setting to 100 Nm and the ceiling to 300 Nm, so it is the choice when a valve manufacturer quotes seating torques above what the smaller frame can safely deliver. Torque switching is set separately for OPEN and CLOSE, which allows a gentle opening setting and a firmer closing setting.

The drive train is a three-phase squirrel-cage motor and a worm gear with limit switching by counter gear. Rated motor power is higher than in the smaller frame, between 0.01 kW and 0.12 kW across the selectable speeds, because the fastest 4 s ratio must move a heavier valve. The same eight operating times from 4 s to 63 s are available, and AUMA also documents a DC motor version for this size with 11 s to 21 s operating times and a run torque of 105 Nm for plants powered from batteries.

Engineering Design of the AUMA SQ 07.2

Mechanically, the AUMA SQ 07.2 is a close relative of the 05.2. Valve attachment is EN ISO 5211 F05/F07 with an F10 option, shaft capacity is 25.4 mm cylindrical, 22 mm square and 22 mm two-flat, and the handwheel is 160 mm in diameter with 11 or 16 turns per 90 degrees. The practical result is that a SQ 07.2 can replace a SQ 05.2 on the same valve without redrilling the flange when the original torque estimate proves too optimistic, a retrofit that engineers often value after commissioning reveals higher friction.

Weight is listed at about 21 kg, or 27 kg with base and lever, the same as the smaller frame, and about 23 kg and 29 kg for the 1-phase AC version. Standard enclosure protection is IP68 under AUMA’s definition of up to 8 m head of water for 96 hours, and the standard KS coating suits high salinity. The ambient range is -30 °C to +70 °C, with options from -60 °C to +120 °C in defined bands for special sites.

Key Features

The AUMA SQ 07.2 brings extra torque headroom without enlarging the housing, which is its main selling point.

• Tripping torque from 100 Nm to 300 Nm covers valves that exceed the entry frame yet do not justify the next housing size.
• The F05/F07 flange with F10 option matches the SQ 05.2, so the same mounting envelope serves two torque classes.
• Eight operating times from 4 s to 63 s at 50 Hz can be matched to the process or to surge protection needs.
• Motor power of up to 0.12 kW at the fastest speed provides the output reserve for heavier closing movements.
• Separate OPEN and CLOSE torque switching allows different protection levels for each direction.
• A 160 mm handwheel and mechanical position indicator keep the valve controllable during power failures.
• A DC motor version of this size is documented by AUMA for sites without an AC supply.
• Compatible with AM and AC actuator controls, including fieldbus options, for later automation upgrades.

Selection Guidance for the AUMA SQ 07.2

Before ordering the AUMA SQ 07.2, collect three numbers from the valve manufacturer: the breakaway torque with the line at maximum differential pressure, the running torque in mid-travel, and the seating torque at full closure. The highest of these, plus the margin your project standard requires, should land inside 100 Nm to 300 Nm. If the figure sits below 100 Nm, the tripping window of this frame is too high and the SQ 05.2 is the better match, because setting the torque switches near the bottom of a range gives coarse protection of the valve stem.

Then decide the closing time. Slow strokes protect pipelines, fast strokes protect processes. Because the operating time is built into the gearing, it cannot be changed in the field, so record it on the purchase specification and keep it with the valve data book.

Industrial Applications

Typical homes for the AUMA SQ 07.2 are butterfly valves on cooling water headers, ball valves on fuel gas and chemical lines, and isolation valves on pump skids where the seating torque is in the low hundreds of newton metres. In desalination and water transmission pipelines, the actuator is frequently specified on bypass and drain valves, where a controlled opening speed matters more than raw output. District cooling plants and large commercial buildings use the same size for chiller isolation duty.

Seven Star LLC supplies the SQ 07.2 as the trusted supplier for AUMA, serving EPC contractors, utilities and industrial plants from Muscat to Salalah. Smaller and larger alternatives are available in the series.

Customers comparing torque classes often look at the AUMA SQ 05.2 as well.

The full range is described on the AUMA SQ part-turn actuator range page, an explosion-proof sibling is covered by the AUMA SQEx explosion-proof part-turn actuator, and control options are described under the AUMA MATIC AM/AC integral actuator controls.

Technical Specifications

The following values are taken from AUMA’s published data for the AUMA SQ 07.2 with a 3-phase AC motor, open-close duty.

Request a Quote for AUMA SQ 07.2

To request a quotation for the AUMA SQ 07.2, share the valve torque data, the supply voltage and the desired operating time with Seven Star LLC. We will answer with a formal offer, delivery options and lead time, and the technical data sheet for review. In Oman and the GCC, we also support commissioning questions and spare part enquiries through our instrumentation division. Ask for the AUMA SQ 07.2 data sheet and a formal AUMA SQ 07.2 quotation today.