In a development of the invention, the positioning unit is configured in {HEAD ~ the manner} of {TAIL ~ an armature} which is rigidly attached to the piston and is axially displaceable in a specified manner by means of a proportional magnet 
In a development of the invention , the positioning unit is configured in { HEAD ~ the manner } of { TAIL ~ an armature } which is rigidly attached to the piston and is axially displaceable in a specified manner by means of a proportional magnet
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH