List of products by brand Alfa Gears

Alfa Gears – Technical profile of a manual gearbox and valve gear operator manufacturer

Alfa Gears manufactures manual quarter-turn gearboxes for butterfly valves, ball valves, plug valves and dampers. The company states that its heavy-duty manual gearboxes cover torque ranges up to 32,000 Nm, with IP67 or IP68 enclosure options depending on the series.

The main product areas include:

• manual quarter-turn gearboxes,
• worm gear operators,
• planetary reduction gearboxes,
• declutchable manual override gearboxes,
• gearboxes for butterfly, ball and plug valves,
• damper operators.

Manual gearboxes are used when the valve torque is too high for direct lever operation or when controlled 0–90° movement is required. They reduce the handwheel or input torque and allow safer manual operation of larger valves.

Alfa Gears E-Range gearboxes are described as manual quarter-turn worm gearboxes for butterfly valves, ball valves, plug valves and dampers, with robust cast iron housing and torque output up to 4,500 Nm.

Declutchable override gearboxes are used with double-acting pneumatic or electric actuators. Their purpose is to allow manual operation of the valve if the automatic actuator system fails or must be isolated for maintenance.

Technical selection requires:

• valve torque,
• maximum differential pressure,
• required safety factor,
• ISO 5211 flange compatibility,
• stem size and coupling,
• handwheel size,
• number of turns,
• enclosure rating IP67 or IP68,
• outdoor or buried service requirements,
• manual override requirement,
• travel stop adjustment,
• position indication.

A gearbox is not simply a mechanical accessory. Incorrect sizing may prevent valve operation, overload the stem or produce excessive input force for the operator. Alfa Gears products are relevant for valve application engineers, water network engineers, industrial maintenance teams and actuator package suppliers.