Outline

The Limitorque L120 Series provides multi-turn valve actuators equipped with a motor and precision gear train.

– Designed with robust structure, high accuracy, and enhanced control functions.
– Superior maintainability ensures long-term stable operation.
– Available in eight unit sizes with multiple protection types, including waterproof and explosion-proof models, to meet a wide range of industrial demands.

Application

– Thermal and hydropower plants.
– Water supply and sewerage systems.
– Petroleum, chemical, shipbuilding, marine, and papermaking industries.
– Direct mounting on multi-turn valves (e.g., gate valves, globe valves, sluice gates, hydraulic gates).
– Can be combined with part-turn actuators for butterfly, plug, and damper valves.

Features

Robust housing
– Small actuators: die-cast aluminum housing.
– Large actuators: cast iron housing.
– Standard protection: IP55 outdoor type.
– Options: water-resistant and explosion-proof.
– Large O-ring design ensures long-term airtightness.

Highly durable gear train
– Worm gears (aluminum bronze) + worms (chrome molybdenum steel).
– Service life of over 100,000 rotations.
– Extreme-pressure grease in sealed gear case.

High-performance torque switch
– High-capacity silver contacts with long life.
– Adjustable across full torque range (open/close).
– Reliable valve protection against overload.

High-precision geared limit switch
– Standard: four-position geared limit switch, 600 V rated.
– Four rotors, each with four contacts, to detect valve positions.
– Adjustable operating point at any stroke position.
– Intermittent gear mechanism prevents shift from preset position.

Safe manual/electric switching
– All models equipped with declutch lever.
– Manual mode via lever; returns automatically to electric mode when motor activates.
– Handwheel remains idle during electric operation.

Earth terminal & space heater (standard)
– Earth terminal for humid environments.
– Space heater ensures stable operation in cold conditions.

Enhanced control functions
– Integral control compatible with local control panels and computerized systems.
– Enables centralized control and networking of multiple actuators.

Benefits

– Proven performance in critical industries worldwide.
– Rugged and reliable design for long service life.
– Flexible protection types for different environments.
– Simplified maintenance and safe manual override.
– Scalable to centralized plant control systems.

Specifications