Part-turn gearboxes can be applied wherever a 90° swivel movement is required for the operation of an obturator. 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.
GQB gearboxes are suitable for applications requiring a simple, cost-efficient gearbox. GQB are exclusively designed for open-close duty and positioning mode. The swing angle is limited to a maximum of 90°.
GHE part-turn gearboxes are used for manual operation of part-turn valves on ships.
If due to a lack of space, valves such as butterfly valves can only be operated via a lever arrangement.
OPEN-CLOSE or modulating duty
Class A: OPEN-CLOSE duty. The actuator is required to drive the valve through its entire travel from the fully open position to the fully closed position or vice versa.
Class B: Inching/positioning or positioning duty. The actuator is required to occasionally drive the valve to any position (fully open, intermediate and fully closed).
Class C:Modulation or modulating duty. The actuator is required to frequently drive the valve to any position between fully open and fully closed.