Abstract: A method and a high-pressure system for determining a flow control variable of a fluid flow flowing through a high-pressure-side high-pressure pump outlet of a high-pressure pump are provided. An externally arranged ultrasonic measuring device measures a flow speed of a fluid flow flowing through a pipe of the high-pressure-side high-pressure pump outlet. A use of an ultrasonic measuring device is provided for determining a flow value to be achieved of a fluid flow flowing through a thick-walled pipe. The ultrasonic measuring device is arranged on the outside on the thick-walled pipe of the high-pressure pump outlet. The pipe has a ratio of the internal diameter to the external diameter of 1:1.5 to 1:5. The ultrasonic measuring device dynamically measures the flow speed of the fluid flow and transmits this measured flow speed to an evaluation unit to compute a current flow value and the flow control variable.

Abstract: A pump injection arrangement can inject a medium at least one process position into a high-pressure process, in particular at least two different pressure levels. The pump injection arrangement includes injection pump apparatuses for the medium and a regulating unit coupled to the injection pump apparatuses and configured for regulating the injection by at least two of the injection pump apparatuses. The pump injection arrangement is configured for synchronized regulation of the injection pump apparatuses with dependence on one another. At least two of the synchronously regulated injection pump apparatuses are double acting bidirectionally operating high-pressure pumps that are functionally coupled with at least single redundancy to the regulating unit such that pressure can be generated via at least two shafts and the pressurized medium can be made available for injection via a joint high-pressure conduit. In this way, advantageous pressure and pumping characteristics can be achieved.

Abstract: A device for cutting a cuttable material with the aid of a fluid, in particular for water-jet cutting, may include a pressure-generating unit and an outlet nozzle that is fluidically connected to the pressure-generating unit via a fluid line. The pressure-generating unit may pressurize the fluid in the fluid line. The device may further comprise a pulsation damper for damping pressure fluctuations in the fluid line. The device may also include at least one switching valve such that, depending on a switching position of the switching valve, the pulsation damper is couplable to the fluid line and uncouplable from the fluid line.

Abstract: A device for cutting a cuttable material with the aid of a fluid, in particular for water-jet cutting, may include a pressure-generating unit and an outlet nozzle that is fluidically connected to the pressure-generating unit via a fluid line. The pressure-generating unit may pressurize the fluid in the fluid line. The device may further comprise a pulsation damper for damping pressure fluctuations in the fluid line. The device may also include at least one switching valve such that, depending on a switching position of the switching valve, the pulsation damper is couplable to the fluid line and uncouplable from the fluid line.