Actuators

Mechanical actuators

Gear operators for valves turned by hand: worm gears for quarter-turn valves up to 32,000 Nm, a declutchable override for actuated valves, and bevel gears for multi-turn gate and globe valves. No power or air needed.

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MAW

ITG

3series

Worm gear, declutchable override and bevel gear

32,000Nm

Highest output torque (MAW)

2,500kN

Highest thrust (MAB thrust base)

IP68

Submersible protection (MAB)

Gear finder

Not sure which gear?

Pick what the gear has to do and the torque your valve needs. We’ll point you to the series that fit.

1. What does it need to do?

2. Valve torque up to

Good options

MAW worm gear

125 – 32,000 Nm · Susin

ITG declutchable gear

60 – 28,000 Nm · Susin

Series

Every mechanical actuator we supply

Pick a series to see every size and model, with torque, ratio and a quote.

Quarter-turn

MAW worm gear

Manual worm gear operators for ball, butterfly and plug valves, with a handwheel and position indicator. ISO 5211 mounting.

125 – 32,000 NmView series

Quarter-turn override

ITG declutchable gear

Fits between an actuator and the valve: a declutch lever switches from automatic to handwheel operation. Works with pneumatic, hydraulic and electric actuators.

60 – 28,000 NmView series

Multi-turn

MAB bevel gear

Bevel gear operators for gate, globe and sluice valves, with thrust bases from 75 to 2,500 kN. IP68, ISO 5210 mounting.

250 – 18,000 NmView series

Torque ranges

How much torque does each series give?

Each bar shows the output torque range of a series, from 60 to 32,000 Nm on a log scale, including gear reduction attachments. Check each series’ model table for ratios and input torque.

101001k10k100k Nm

Brand

MAW worm gear

Handwheel · ISO 5211 · up to IP67M

125–32,000 Nm

ITG declutchable gear

Manual override · ISO 5211 / 5210

60–28,000 Nm

MAB bevel gear

Multi-turn · IP68 · 75–2,500 kN thrust

250–18,000 Nm

MAB thrust bases take 75 to 2,500 kN of axial load: see the MAB page.

Complete the package

Controls and other actuators

Add a limit switch box to report the valve position, or automate the valve with a powered actuator.

Limit switch boxes

Signal open and closed positions to the control room; they mount on the actuator.

IP67 / IP68

Pneumatic actuators

Where compressed air is available: rack & pinion, scotch yoke and linear, up to 120,867 Nm.

Double acting or spring return

Electric actuators

Quarter-turn, multi-turn and linear, including a spring-return fail-safe series.

25 – 9,000 Nm

Hydraulic actuators

Electro-hydraulic and hydraulic scotch yoke actuators for the largest valves.

46 – 112,595 Nm

See all actuators

FAQ

Mechanical actuator questions

Worm gear or bevel gear?

Worm gear operators (MAW, ITG) turn quarter-turn valves such as ball, butterfly and plug valves through 90°. Bevel gear operators (MAB) are multi-turn, for gate, globe and sluice valves that need many turns of the stem.

What is a declutchable gear override?

The ITG fits between an actuator and the valve. In normal service the actuator drives the valve; a declutch lever disengages it so the valve can be turned by handwheel, for example during commissioning or a power or air failure.

Can I fit an actuator later?

The ITG is made to work with pneumatic (double acting and spring return), hydraulic and electric actuators. Tell us the actuator and valve and we’ll confirm the mounting.

Are low and high temperature versions available?

Yes. The standard range is about -20°C to +85°C (MAB -20°C to +80°C), with low-temperature options down to -45°C and high-temperature options on the series pages.

Which mounting standards do they use?

Quarter-turn gears (MAW, ITG) mount to ISO 5211 valve flanges; the ITG also offers ISO 5210. Multi-turn MAB gears use ISO 5210.

Not sure which gear?

Send us the valve, its torque, the mounting flange and whether it is quarter-turn or multi-turn, and we’ll size the gear and quote it.

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