Gearbox - E-Range | Alfa Gear

Name: Gearbox - E-Range | Alfa Gear
Brand: Alfa Gears
SKU: Gearbox - E-Range | Alfa Gear

ALFA Gear E Range Worm Gearbox

The ALFA Gear E Range is a manually operated quarter-turn worm gearbox designed for butterfly valves, ball valves, plug valves, and dampers. It is specified where required operating torque exceeds practical lever use or where controlled 0–90° movement with mechanical reduction is necessary.

Technical Specifications

8 sizes: E12, E25, E35, E55, E100, E200, E350, E450
Output torque: 120 to 4,500 Nm
Gear ratios: 1:34 to 1:55
Operating angle: 0–90°, adjustable ±5°
Ingress protection: IP67 standard, IP68 optional
Operating temperature: -50 to +150 °C
Valve interface: EN ISO 5211 or DIN 3210 with adaptation

Construction Materials

Body and cover: cast iron GG25. Sector gear: GGG40. Worm: C45 carbon steel. Shaft: C45 black oxide. Sealing: NBR70 gasket and O-rings. Lubrication: Lithium EP2. Axial needle bearing: AS/AXK.

Selection Logic

Selection is based on maximum valve torque, not only DN. Consider:

differential pressure across the valve
seat material and sealing class
duration of inactivity
media with solids or deposits
required ISO 5211 flange
shaft type: square or bore/key

Applications

Used on manually operated isolation valves in water, air, steam, cooling, water treatment, HVAC, marine, and auxiliary industrial systems. Media compatibility is determined by the valve; gearbox selection is based on torque, environment, interface, and operating frequency.

FAQ

When is a gearbox selected over a lever?
When operating torque is high, valve size is large, or slower, controlled actuation is required.

What is checked during maintenance?
Housing tightness, mechanical stops, shaft alignment, coupling wear, handwheel condition, and resistance to rotation under load.

Datasheet and documents

Materials & Dimensions

Description

Robust and Heavy duty. Economic range quarter turn Gearbox. Cast Iron GG25 Body

Suitable for Butterfly, ball and plug valves.

8 Sizes · Up to 4.500 Nm · IP67 enclosure · Insert sytem

GENERAL TECHNICAL INFORMATION

Application

Alfa-Series quarter-turn worm gearboxes are applied to ball valves, butterfly valves, dampers and other 90° rotary valves. Alfa Gears hand wheels are with a variety models for optimal operation.

Operating Enviroment

Alfa Gears quarter-turn Worm gearboxes are with good mechanical quality and steady operating performance which apply to deal with variety climate and temperature. We strive to develop Alfa Gears valve gear operators to meet higher demands in the market.

Factory Standard

Enclosure: IP67 Standard (IP68 on request) Working Temperature: From -50°C to 150°C (-4°Fto248°F) Painting: Black RAL 9005, or according customer specification

Connect with Valve

The flange connecting to valve is according to EN ISO5211 or DIN3210 (Customization). including Sintered coupling system for various shaft connections. Please click on our link to dowload the Alfa Gears Dimensions or Alfa Gears Materials specification.