Rotork Australia GP and GH ranges of scotch yoke actuators

The GP and GH ranges of scotch yoke pneumatic and hydraulic actuators are designed to operate ball, butterfly and plug valves requiring a rotary, quarter-turn movement for either on/off or modulating duty.

Spring-return units can be assembled to provide failsafe operation in either direction. The spring-return module is inherently safe since it can only be removed from the centre body after all spring forces have been released. Centre bodies incorporate a pressure relief valve.

Both ranges can be supplied with either symmetrical or canted torque arms. The classic symmetric yoke delivers peak torque at both ends of stroke. The canted yoke is a Rotork design innovation that delivers peak torque at only one end of stroke. Use of canted arms can often reduce actuator size, weight and cost for valves with appropriate torque demand characteristics.