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QX Series

The Limitorque QX is the entry into the quarter-turn, non-intrusive, double-sealed, smart electronic actuator marketplace. The QX design builds on more than 15 years of proven MX technology to provide all the user-preferred features in a quarter-turn smart actuator package.




Sewage collection and treatment, tank farm transfer, water supply and distribution (water), boiler circulation, decoking, petroleum production and refining, filtration, nuclear service, gas production, heavy oil, oil sands and shale, molten salt transfer, desalination


Oil and gas, power generation, mining, water treatment, wastewater collection and treatment, water supply and distribution, nuclear power

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What sets the QX quarter-turn actuator apart is the combination of control and reliability integrated by advanced Limitorque technology. An innovative handwheel parallel to the LCD screen permits the actuator to be installed in areas with limited space. It also eases manual setup and operation routines. The LCD screen provides local actuator control as well as calibration and diagnostic information. This information includes motor voltage, identification, and hardware and software data.

The QX electronic actuator network options include Modbus® DDC, Foundation Fieldbus™ H1, PROFIBUS DP™ V1, PROFIBUS PA™, DeviceNet™, and HART®. Pioneered by the innovative absolute encoder first introduced on the MX, the QX actuator features an absolute encoder for positioning. This does not require troublesome batteries and is designed with B.I.S.T. (built-in self-test) capability for self-diagnosis.

The QX employs an advanced brushless DC (BLDC) motor. This motor eliminates sparks, reduces mechanical and electrical noise, and dissipates heat better than brushed DCV motors. BLDC motors are noted for endurance and accurate positioning. They also permit connection of a global range of voltages (single-phase and three-phase ACV and 24-48 DCV) without modification to the actuator.


  • LimiGard circuitry, which safeguards the actuator from spurious electromagnetic interference
  • 100% solid state controls
  • Torque sensing — Limitorque’s namesake feature

Call us today at (708) 388-3232

24-Hour Emergency Service

Our associates are available when you need them. We can respond by providing emergency parts, machining, or on-site technical expertise. We specialize in servicing actuators, that have malfunctioned electronically or mechanically, causing system shutdown or redirection. We aim to get you back in business as soon as possible.

Call our 24-hour line at (630) 989-3231