Product - CML Enclosed Control Drive Actuator

​​​​​​Enclosed Control Drive Actuator with Lever Manual Override

The CML series pneumatic actuator system is composed of an actuator and a manual override integrated into a steel housing which is portable. This rugged construction guarantees continuous operation in harsh environments, for example in power stations, steel industries, petrochemical plants or desert areas etc. This actuator provides small to medium torque (up to 100 daNm) for angular control of dampers, butterfly valves, speed variators, radial vanes etc. Manual operation is by a clutchable lever, equipped with a mechanical system. This system allows the movement of the actuator through an external lever and locks it in the required position.​

Key features

  • ​Actuator with manual override and lock
  • Portable within steel housing
  • Up to 100 daNm
  • 20°​C to 70°​C
  • Lever has 70° or 90° operating angle
  • Typical operating pressure 7barg up to 10 barg
  • Front easily removable foraccess / maintenance


  • Ideal for use in harsh environments maintaining excellent performance
  • No competitors have such a wide range of products
  • Manual override built-in as standard
  • Easy installation of a wide range of accessories on a separate internal panel
  • ​Easy maintenance
  • Designed for a long operating life​
  • Internal​ linear (SC) actuator with built-in permanent lubrication system (see SC brochure for more information)​
  • Balancing Security Sensor device (BSS) to switches automatically from manual function to modulating with signal (after
    request to come in service) only when the signal matches position where actuator is mechanically locked from manual override. (BSS is available as an option).​

Actuator with piston built-in permanent lubrication system​

​The CML utilises an IMI STI linear actuator from the SC series of actuators with a built-in permanent lubrication system, which has been patented by IMI STI. This ensures an extremely smooth valve operation even if dry instrument air is used. Thanks to this
lubrication system, which is common t​o all IMI STI actuators, no maintenance of the moving parts is required, even after many years of continuous service.​​
The patented lubrication system consists mainly of a grease lubricant filled annular cavity placed inside the cylinder piston, between a sealing ring and a sliding ring to avoid direct contact between the metal surfaces of the piston and the cylinder, even in case of lateral forces acting on the actuator stem; the annular cavity is filled with grease which, during the piston movement, keeps the metal parts lubricated allowing very smooth sliding and a long seal life.​

Technical specifications​

Carbon steel

Lever shaft
Alloy steel 38 NiCrMo4 heat treated

Shaft support
Bronze bushing on bearing
External lever
Carbon steel

Manual override
Manual by-pass function for manual override using an external lever
Tubing & fittings
Brass fittings and copper tubing (stainless steel 316 available on option) 
Standard painting
RAL 7030 grey
Air supply
Dry instrument air according to ISO 8573-1

Operating pressure
Pneumatic version from 7 barg up to 10 barg (special version available on request)

Standard operating temperature
20°C to 70°C (lower or higher temperature on request)

Working lever operating angle
63/125 and 100/100 -> 90°
100/200 and 125/200 -> 70°

Available with a wide range of positioners, in particular we suggest FT positioners (see FT brochure for more information)​

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Product - CML Enclosed Control Drive Actuator