AUMA SQR 07.2 Modulating Part-Turn Actuator

Overview

AUMA SQR 07.2 takes the modulating design of the SQR 05.2 and doubles its torque capacity without changing the footprint. The tripping torque is adjustable from 150 Nm to 300 Nm, and the permissible modulating torque is 150 Nm at S4 – 25 % duty. For a control valve whose torque demand during travel approaches the upper end of what a 75 Nm modulating limit allows, this is the frame to specify.

Seven Star LLC, official trusted supplier and regional supplier for AUMA, supplies the AUMA SQR 07.2 to industrial, utility and building-services projects across Oman and the GCC. Our engineers compare the control valve torque curve with the modulating rating before recommending this size, because under-sizing a modulating actuator shortens its service life.

Reading the Modulating Torque Data

Two numbers define the modulating capability of the AUMA SQR 07.2. At S4 – 25 % the modulating torque is limited to 150 Nm, and with the optional S4 – 50 % duty class the figure falls to 110 Nm and the maximum tripping torque is limited to 220 Nm. The minimum tripping setting is 150 Nm. Because the modulating rating is half the maximum tripping torque, the valve should be sized so that its running torque stays well below the modulating limit and only the seating torque approaches the tripping value.

The same six operating times as the SQR 05.2 are available at 50 Hz: 8, 11, 16, 22, 32 and 63 seconds. Pulse duration for movement in the same direction is 50 ms, and the minimum pulse on reversal rises from 160 ms at the fastest ratio through 200, 265, 350 and 480 ms at the slower ratios. Up to 1,500 starts per hour are permitted, which supports flow and pressure loops with frequent correction. The 63 s ratio is available at S4 – 25 % only.

Engineering Design of the AUMA SQR 07.2

Mechanically the AUMA SQR 07.2 shares the F05/F07 flange, F10 option, 25.4 mm cylindrical, 22 mm square and 22 mm two-flat shaft capacity and the 160 mm handwheel of its smaller sibling. The handwheel needs 11 or 16 turns for 90 degrees, and a mechanical position indicator shows valve position without power. An SQR 07.2 can therefore be fitted to a valve bracket originally drawn for a 05.2 if a retrofit demands more torque.

The weight is about 21 kg, or 27 kg with base and lever, and the 1-phase AC version is listed at roughly 23 kg and 29 kg. IP68 enclosure protection and KS corrosion protection are standard. Position feedback is delivered through AM or AC actuator controls, and the AC controls add data logging and non-intrusive settings through the magnetic limit and torque transmitter, which helps commissioning in hot outdoor locations.

Key Features

The AUMA SQR 07.2 offers more control torque while keeping the compact SQ .2 housing.

• A tripping torque of 150 Nm to 300 Nm with 150 Nm modulating torque at S4 – 25 % suits larger control valves than the 05.2.
• The S4 – 50 % option allows 110 Nm modulating torque and 220 Nm maximum tripping torque for heavier duty cycles.
• Up to 1,500 starts per hour and a 50 ms pulse duration enable fine positioning in closed loops.
• Reversal pulse durations from 160 ms to 480 ms across the main ratios keep direction changes controlled.
• Six operating times from 8 s to 63 s allow loop speed to be tuned.
• The same F05/F07 flange and 160 mm handwheel as the 05.2 simplify valve brackets and spares.
• IP68 and KS corrosion protection withstand outdoor and coastal exposure.
• Combines with AM or AC controls for analogue, Profibus, Modbus and other fieldbus control.

Selection Guidance for the AUMA SQR 07.2

When deciding between the SQR 05.2 and the AUMA SQR 07.2, compare the valve running torque with the modulating figures, not the tripping range. A control valve with a running torque of 100 Nm exceeds the 75 Nm modulating limit of the 05.2 but sits comfortably within the 150 Nm of this frame. Using the larger actuator in that case keeps the motor away from its thermal limit and extends the life of the gear train.

Also decide whether the S4 – 50 % option is needed. It reduces the modulating torque to 110 Nm but allows a heavier duty cycle, which makes sense for loops with an aggressive controller.

Industrial Applications

The AUMA SQR 07.2 suits control butterfly valves on cooling-water branches, ball valves on fuel and process gas regulation, and larger dampers in HVAC plants. In water treatment it positions valves on filter backwash and chemical dosing headers where flow must be adjusted frequently. Power station auxiliary systems use it on moderate-torque control valves that are cycled throughout the day.

In Oman and the GCC, Seven Star LLC supplies the SQR 07.2 to customers in Muscat, Sohar and Salalah, with local support.

Neighbouring modulating frames are the AUMA SQR 05.2.

For on-off duty see the AUMA SQ part-turn actuator range, for the explosion-proof alternative see the AUMA SQEx explosion-proof part-turn actuator, and for controls see the AUMA MATIC AM/AC integral actuator controls.

Technical Specifications

The values below are drawn from AUMA’s data for the AUMA SQR 07.2 with a 3-phase AC motor in modulating duty.

Request a Quote for AUMA SQR 07.2

For a quotation on the AUMA SQR 07.2, send Seven Star LLC the control valve data, the running and seating torque, the supply and the control signal type. We will return a formal offer with delivery information, and the technical data sheet is linked on this page. In Oman and the GCC, we supply the drives on request, with lead time confirmed at quotation. Contact our instrumentation division to start your AUMA SQR 07.2 enquiry.