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Mechanical actuators
Susin quarter-turn manual worm gear actuators for ball, butterfly and plug valves and dampers. 15 sizes from 125 to 32,000 Nm, each as standard or, from the MAW-300, with a single or double stage reduction: 30 models in all.
Sizes
Fifteen sizes, with the ISO 5211 flange on the left. Every gearing of a size has the same torque; open a size to compare its gearings.
Gearing and handwheel effort
From the MAW-300 up, each size also comes with a single (1S) or double (2S) stage helical reduction. More mechanical advantage means less force on the rim but more turns of the handwheel.
FAQ
Take the valve’s maximum operating torque and pick the smallest MAW whose output torque covers it, then check the ISO 5211 flange (standard or option) and the stem fits the drive bush.
All gearings of a size have the same torque. A reduction stage raises the mechanical advantage, so the rim pull falls, but the handwheel takes more turns. Use the rim effort check above; Susin’s standard limit is 360 N.
Quarter-turn valves: ball, butterfly and plug valves and dampers, in general industry, chemical, power, HVAC and waterworks. For gate and globe valves, which need many turns, use a multi-turn bevel gear such as the MAB.
Yes. Stop bolts set both end positions, with ±5° of adjustment.
Yes. An electric actuator mounts on the MOV flange to ISO 5210, and limit switches can be fitted on site without machining.
Standard is −20 to +85 °C. A low temperature version covers −45 to +120 °C.
Compare all 30 MAW models, or send us the valve torque, flange and stem and we’ll pick the size and gearing.
