The CQ range provides an innovative fully-concentric and balanced actuator design for quarter-turn valves. The design features a helical mechanism that transforms linear piston motion into quarter-turn valve stem rotation. CQ actuators provide a much higher torque output for a given footprint than scotch yoke designs typically utilised to operate many quarter-turn valve types. It is therefore ideally suited for installation in confined spaces. Further, Rotork’s unique helical pin design provides higher efficiency than a helical gear mechanism utilised by other valve actuator manufacturers.

As standard, the CQ torque output profile, like that of a scotch yoke actuator, is engineered to parallel the torque demand profile typically found with popular quarter-turn valve types. The CQ design however is unique in that the torque profile can be custom engineered and manufactured to meet specific, non-standard valve torque requirements.

In our experience, the CQ standard range of sizes is suitable for applications that require a pneumatically powered actuator with torque demand less than 150,000 Nm. However, we also engineer CQ actuators with greater output and/or hydraulic power. Please apply to Rotork for these applications.

  • Pneumatic actuator in double-acting and spring-return configurations
  • Fail-close/fail-open
  • For on/off
  • Torque output up to 150,000 Nm (110,634 lbf.ft.)- higher torques are available on request
  • Certified to IP 66M/67M
  • Certified to ATEX 2014/34/EU
  • Certified in accordance with PED 2014/68/EU
  • Certified suitable for use at SIL3 as a single device with IEC 61508



See CQ literature page for further details.