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Mechanical actuators
Susin declutchable worm gears that fit between a pneumatic actuator and a quarter-turn valve, so an operator can turn the valve by hand when the air fails or during commissioning and maintenance. 15 sizes from 60 to 28,000 Nm: 29 models with the reduction versions.
Sizes
Fifteen sizes, with the valve ISO 5211 flange on the left; the actuator flange is in each note. Every gearing of a size has the same torque.
Gearing and handwheel effort
From the ITG-400 up, each size also comes with a single (1S) or double (2S) stage helical reduction. More mechanical advantage means less force on the rim in manual, but more turns of the handwheel.
FAQ
With the lever in Auto the gearbox connects to the pneumatic actuator. Pull the locking unit holder, turn the lever to Manual and check the gears are fully engaged with the worm; the handwheel now turns the valve. Put the lever back to Auto for pneumatic operation.
Take the valve torque and pick the smallest ITG whose output torque covers it. Then match the valve flange and the actuator flange (ISO 5211, standard or option) and the drive to the valve stem.
Yes. Susin designed the ITG for both double-acting and spring-return pneumatic actuators.
All gearings of a size have the same torque. A reduction stage lowers the rim pull but adds handwheel turns. Use the rim effort check above; Susin’s standard limit is 360 N.
The MAW is a manual worm gear on its own. The ITG sits under an actuator and only engages when you switch it to Manual, so the valve stays automated.
Standard is −20 to +85 °C. A low temperature version covers −45 to +120 °C.
Compare all 29 ITG models, or send us the valve torque and the valve and actuator flanges and we’ll pick the size and gearing.
