Rotork CQ Range - Compact Helical Actuator

Brand: Rotork plc

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.

  • Up to 150,000 Nm (1,300,000
Operating Medium
  • Instrument air
  • Mineral oil
  • Sweet, clean and dry natural gas / nitrogen
Design Pressure
  • 12 barg for the pneumatic
Stroke Adjustment
  • 90° ± 5°
Temperature Range
  • Standard: -30° to 100° C (-22° to 212° F)
  • PED Compliant: -20° to 160° C (-4° to 320° F)
  • Low: -40° to 160° C (-40° to 320° F)
  • Extreme Low: -60° to 160° C (-76° to 320° F)
  • IP66M/IP68, PED, IECEx, EAC, suitable for SIL3 application
  • Actuators certified to ATEX 2014/34/EU



Operating Pressure

  • Up to 7 bar (175 psi)

Torque Output

  • Up to 150,000 Nm (1,300,000 Standard

Temperature Range

  • Extreme Low: -76° to 320° F (-60° to 160° C)
  • High: -4° to 320° F (-20° to 160° C)
  • Low: -40° to 320° F (-40° to 160° C)
  • Standard: -22° to 212° F (-30° to 100° C)

Environmental Protection

  • IP66
  • IP68

Approvals & Certifications

  • ATEX
  • EAU
  • PED

Approvals & Certifications

  • SIL3


  • Manual Override

Flange Material

  • End/Bottom Flange: Carbon Steel

Drive Shaft Material

  • Carbon Steel

Material of Construction

  • Cam Follower Bearing: Aluminum Bronze
  • Piston, Helical/Vertical Slot Cylinder & Pneumatic Cylinder: Carbon Steel
  • Spring: Spring Steel
  • Upper/Lower Stop Bolt & Tie Rod: Alloy Steel

Shaft Size

  • 10 to 120 mm

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.
  • Weatherproof housing suitable for harsh environments
  • Applications: SIL3, functional integrity, safety, limited space
  • Pneumatic, single and double-acting

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