Patent ID: 7938713

Claim:
A control device for controlling the impingement of a workpiece by a water jet or an abrasive water jet in a cutting unit, the control device comprising: a feeder composed of at least two flow-through areas positionable between a high-pressure water supply and a jet nozzle of the cutting unit, wherein at least one of the flow-through areas includes a high pressure area, and at least one of the flow-through areas includes a pressure-reducing area; at least one switchable valve arranged in the high-pressure area; a pressure-reducing mechanism arranged in the pressure reducing area; and an impingement line coupled to the at least two flow-through areas and coupleable to the jet nozzle; and further comprising: the at least one switchable valve being arranged in parallel to the pressure reducing area; and at least one hole breakthrough sensor adapted to control the control device.