Product - CMV Large Enclosed Control Drive ​Actuator

​​​​​Large Enclosed Control Drive ​Actuator with Auto Engaged Manual Override

The CMV series pneumatic actuator system consists of an actuator and a manual override integrated into a steel housing which is also a portable structure. This rugged construction guarantees continuous operation in harsh environments, for example in power stations, steel industries, petrochemical plants, desert areas, etc. This actuator is able to control final elements like dampers or hydraulic converters with high power actuators. In this actuator, the housing provides a double function of protection and a bearing frame. The engaging of the manual control is made automatically or manually through a dedicated switch.​ 

​​Key features

  • Actuator with manual override and lock
  • Portable within reinforced steel housing for sturdy support for high forces 
  • Up to 4000 daNm
  • -20degC to 70degC
  • Lever has 70deg operating angle for convenient orientation
  • Lever orientation variable on
  • Splined shaft
  • Typical operating pressure 7barg up to 10 barg
  • Mechanical position indicator
  • Large removal panels for ease of access and maintenance​


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

Actuator with piston built-in permanent lubrication system​

​The CMV utilises an IMI STI linear SC series
of actuators with a built-in permanent lubrication system, patented by IMI STI, which assures an extremely smooth valve operation even if dry instrument air is used. Thanks to this lubrication system, which is common to all IMI STI actuators, no maintenance of the moving parts is required, even after many years of continuous service. The patented lubrica​tion 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 a very smooth sliding and a long seal life.​

Technical specifications​

Carbon steel

Lever shaft
Alloy steel 38 NiCrMo4 heat treated

Shaft support
Bronzw bearing for CMV-2 to CMV-4
Spherical joints for CMV-1

External lever
Carbon steel

Manual override
Pneumatic by-pass function for manual override using an external lever

Bearing frame​
Carbon steel
Manual control screw
Alloy steel 38 NiCrMo4 heat treated

Tubing & fittings
Brass fittings and copper tubing (stainless steel 316 available on option)

Standard painting
RAL 7030 grey

Lever features
70° operating angle​
Lever orientation variable on splined shaft
Mechanical position indicator
Control signal
4 to 20 mA (3 to 15 psi)special cam and/or special control signal available on request

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) 

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

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Product - CMV Large Enclosed Control Drive ​Actuator