The CQ range provides an innovative fully-concentric and balanced actuator design for quarter-turn valves. A unique helical pin mechanism transforms linear piston motion into quarter-turn valve stem rotation much more efficiently than helical gear mechanisms used by other manufacturers. CQ is available in pneumatic (CQP) and hydraulic (CQH) configurations and is ideally suited for installation in confined spaces. The CQ provides much higher torque output for a given footprint than scotch yoke designs typically used to operate quarter-turn valves.