Part-turn gearboxes

According to ISO 22109 and ISO 22153, a part-turn gearbox is a gearbox which transmits torque to the valve for less than one revolution and that can be manually operated by handwheel and/or automated with a multi-turn actuator.

Part-turn gearboxes can be applied wherever a 90° swivel movement is required for the operation of a closing element. GS part-turn gearboxes combined with SA multi-turn actuators act as part-turn actuators.

Consequently, nominal torques up to 675,000 Nm can be achieved. These combinations complement the SQ type range for part-turn valves. GS are suitable for open-close and modulating duty. Both swing angle > 90° as well as multi-turn applications are possible.

GHE part-turn gearboxes are used for manual operation of part-turn valves on ships.

Part-turn gearbox with base and lever offer consequently an ideal solution if valves like butterfly valves can only be operated using a lever arrangement, due to space constraints.