Derivative Unit

UD Derivative Unit is a specific device to amplify the exhaust. The regulating system is specifically designed for modulation and allows an accurate tuning to maximize speed without compromising the stability of the actuator.

This product is designed to be used in modulating systems (amplification of positioner exhaust flow) and also for on/off systems.

Exclusive manifold mounting system

Exclusive manifold mounting system

It is a special IMI STI application to connect our accessories. Fittings or nipples are not necessary as the connection is achieved using machined connection faces with sealing 'o' ring. This system saves time for assembly, reduces costs, inventory and the shortened dimensions save space.


  • Activation system available in 2 versions for pilot
  • High sensitivity
  • High exhaust CV
  • Full tight zero leakage
  • Regulation screw cannot be ejected by internal air pressure
  • Specific design allows for accurate regulation of activation on modulating systems
  • SIL certificate 

Technical data

Operating pressure

3÷7 bar

(design pressure 10 bar)

Standard operating temperature

-20°C to 70°C

(lower or higher temperature on request)

Housing materials

Anodized aluminium

Stainless steel 316

CV max

Exhaust = 3.8


Pilot signal connection

ND 1/2”

Exhaust connections

 ND 3/4”

Contact us for more information