A new line of  electronic proportional air pressure regulators is now completing the exhisting one.
3 sizes with different electronics construction solutions and flow from 1000 to 4000 nl/min. are available:
-basic version with energized signal control( 0-10 volt) or direct operated
-display version
-analogical outlet version
-version operating with serial "port" RS 232

Many are the applications requiring this  product ( i.e. to control a cylinder force by changing pressure value).
The proportional technique allows this type of adjustment by acting on a different parameter ( voltage or current strength value) directly connected with pressure value.