The Flowserve Limitorque QX, non-intrusive electric actuator is designed for a wide range of environmental applications in power, oil & gas, and water industries. The QX design builds on more than 20 years of proven MX technology to provide all the user-preferred features in a quarter-turn smart actuator package.


  • Power

  • Oil & Gas

  • Chemical

  • Water

  • General Industry


  • Greater process control with non-contacting absolute encoders that provide accurate position sensing

  • B.I.S.T., built-in self-test which never needs batteries to retain position data, even in the event of main power loss

  • Extreme environment performance made possible by non-intrusive design, 100% solid-state controls, and reliable digital communication control system

  • Versatility provided by flexible control configurations, setup and diagnostics in 11 languages, and advanced brush-less DC motor that supports most global voltages, AC or DC

  • 100% repeatable and redundant absolute encoder for position sensing

  • Electronic torque switch

  • 3-phase, 1-phase, and DC motors