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Mechanical actuators

Susin

MAB series bevel gear actuators

Susin manual bevel gear actuators for gate, globe and other multi-turn valves. 11 sizes from 250 to 18,000 Nm with 75 to 2,500 kN of thrust, each as standard or with a single or double stage reduction: 28 models in all.

Models
28 (MAB-075 – 2500)
Torque
250 – 18,000 Nm
Thrust
75 – 2,500 kN
Gear ratio
2.5:1 – 151.87:1
Protection
IP55, IP65, IP67M or IP68
Mounting
ISO 5210, F07 – F48
View all 28 models Get a quote
About Susin Download catalogue (PDF)
How a bevel gear actuator works
Stem coverISO 5210 flangeHandwheelSpiral bevel gearPinionDrive sleeveGate shutStem risen, gate openRatio 4:14 turns per sleeve turn
Gears turn the drive through 90° Sleeve and stem bush drive the stem

Sizes

Pick a size by torque and thrust

Eleven sizes, with the ISO 5210 flange on the left. Every gearing of a size has the same torque, thrust and stem; open a size to compare its gearings.

F10 MAB-075
F101 model
MAB-075
75 kN thrust, stem up to 28 mm (TW), ratio 2.5:1. 9.5 kg standard.
250 Nmmax torque
Std75 kN
F12 MAB-100
F121 model
MAB-100
100 kN thrust, stem up to 36 mm (TW), ratio 3:1. 12 kg standard.
420 Nmmax torque
Std100 kN
F14 MAB-125
F142 models
MAB-125
125 kN thrust, stem up to 44 mm (TW), ratio 3.5:1 / 7:1. 22 kg standard.
700 Nmmax torque
Std · 1S125 kN
F16 MAB-150
F163 models
MAB-150
150 kN thrust, stem up to 54 mm (TW), ratio 3.75:1 / 9.4:1 / 15:1. 30 kg standard.
1,100 Nmmax torque
Std · 1S · 2S150 kN
F16 MAB-200
F163 models
MAB-200
200 kN thrust, stem up to 62 mm (TW), ratio 4:1 / 12:1 / 16:1. 34 kg standard.
1,600 Nmmax torque
Std · 1S · 2S200 kN
F25 MAB-300
F253 models
MAB-300
300 kN thrust, stem up to 70 mm (TW), ratio 5:1 / 15:1 / 45:1. 70 kg standard.
2,500 Nmmax torque
Std · 1S · 2S300 kN
F35 MAB-350
F353 models
MAB-350
350 kN thrust, stem up to 85 mm (TW), ratio 5.5:1 / 16.5:1 / 49.5:1. 95 kg standard.
3,800 Nmmax torque
Std · 1S · 2S350 kN
F35 MAB-400
F353 models
MAB-400
400 kN thrust, stem up to 95 mm (TW), ratio 6:1 / 21:1 / 73.5:1. 130 kg standard.
5,600 Nmmax torque
Std · 1S · 2S400 kN
F40 MAB-500
F403 models
MAB-500
500 kN thrust, stem up to 110 mm (TW), ratio 6.5:1 / 22.75:1 / 79.63:1. 175 kg standard.
7,800 Nmmax torque
Std · 1S · 2S500 kN
F40 MAB-1200
F403 models
MAB-1200
1,200 kN thrust, stem up to 120 mm (TW), ratio 7:1 / 28:1 / 112:1. 195 kg standard.
12,000 Nmmax torque
Std · 1S · 2S1,200 kN
F48 MAB-2500
F483 models
MAB-2500
2,500 kN thrust, stem up to 150 mm (TW), ratio 7.5:1 / 30:1 / 151.87:1. 390 kg standard.
18,000 Nmmax torque
Std · 1S · 2S2,500 kN
Cut-away of a Susin MAB bevel gear actuator showing the bevel gear, drive sleeve and input pinion

How it’s built

  • Spiral bevel gear and pinion. Alloy steel EN-19 / AISI 1045, turning the drive through a right angle on thrust bearings.
  • Replaceable stem bush. A splined aluminium bronze bush inside the ductile iron drive sleeve, held by two locknuts and easy to change for a new stem.
  • Ductile iron housing. A536 65-45-12 top and bottom housings with a non-asbestos gasket. Cast iron is an option.
  • MOV flange. An ISO 5210 flange on top lets an electric actuator mount on the gearbox, for a motor operated valve.
  • Coated for site. Epoxy and PU on the housing and a powder-coated handwheel; special paint systems for marine and offshore.
  • Sealed to IP68. IP55, IP65, IP67M or IP68, from −20 to +80 °C; low and high temperature versions down to −70 °C and up to +120 °C.

Gearing and handwheel effort

Standard, 1S or 2S?

Each size comes in up to three gearings with the same torque, thrust and stem. A reduction attachment adds mechanical advantage, so the operator pushes less on the rim but turns the handwheel more.

Standard
Bevel gear only. The fewest handwheel turns, for smaller valves or where an electric actuator will drive it through the MOV flange.
11 sizesRatio 2.5:1 – 7.5:1MA 2.27 – 7.2250 – 18,000 Nm
Single stage reduction (1S)
A single stage reduction attachment on the input. More mechanical advantage, so less force on the rim for the same valve.
9 sizesRatio 7:1 – 30:1MA 5.72 – 26.64700 – 18,000 Nm
Double stage reduction (2S)
A double stage reduction attachment. The lightest handwheel effort, for large valves turned by one operator; it takes the most turns.
8 sizesRatio 15:1 – 151.87:1MA 11.02 – 133.131,100 – 18,000 Nm
Rim effort check
Enter the valve torque. For each gearing you get the smallest MAB that takes it, and the force on the rim of its recommended handwheel.
Standard
MAB-200
Ø 600 mm handwheel, MA 3.63
≈ 1,377 N on the rim, above 360 N
Single stage reduction (1S)
MAB-350-1S
Ø 600 mm handwheel, MA 14.67
≈ 341 N on the rim
Double stage reduction (2S)
MAB-300-2S
Ø 500 mm handwheel, MA 36.22
≈ 166 N on the rim
Rim effort = valve torque ÷ mechanical advantage ÷ handwheel radius, using Susin’s figures (mechanical advantage ±10%). Susin’s standard limit is 360 N. A guide only: we confirm the model from the full valve data.

FAQ

MAB bevel gear questions

How do I choose the size?

Start from the valve’s maximum torque and, for a rising stem, its thrust. Pick the smallest MAB whose torque and thrust both cover them, then check the stem fits (TW thread or keyed bore) and the ISO 5210 flange matches the valve.

Standard, 1S or 2S?

All gearings of a size have the same torque and thrust. A single (1S) or double (2S) stage reduction raises the mechanical advantage, so there is less force on the rim but more turns of the handwheel. Use the rim effort check above: Susin’s standard limit is 360 N.

Can an electric actuator drive it?

Yes. The MOV flange on top is ISO 5210, so a multi-turn electric actuator can mount on the gearbox to make a motor operated valve.

Does it work with rising stems?

Yes. The stem passes through the bronze stem bush in the drive sleeve and up into the stem cover. Allowable thrust runs from 75 kN on the MAB-075 to 2,500 kN on the MAB-2500.

Can it be buried or flooded?

IP68 is one of the protection ratings Susin offers, alongside IP55, IP65 and IP67M. Tell us the site conditions and we’ll quote the right rating and paint system.

Which temperatures can it take?

Standard is −20 to +80 °C. Low temperature versions go from −45 to +100 °C and high temperature versions from −70 to +120 °C.

Know the valve torque?

Compare all 28 MAB models, or send us the valve torque, thrust, stem size and flange and we’ll pick the size and gearing.

Compare models All mechanical actuators