Abstract: A high pressure cutting arrangement includes two pressurized streams: a liquid stream and a slurry stream. The two streams are independently pressurized, and then combined at pressure. The combined stream is then accelerated through a nozzle to provide a cutting jet.

Abstract: A nozzle for a high pressure cutting arrangement is disclosed. The cutting arrangement comprises a liquid stream and a slurry stream, the slurry comprising abrasive particles suspended in a fluid, with both fluids being supplied into the nozzle under pressure. The nozzle has a combining chamber, having an entry region arranged to receive the liquid stream and the slurry stream, such that the pressure in the entry region is determined by the pressure in the liquid stream. The pressure in the entry region acts on the pressure in the slurry stream to regulate the pressure in the slurry stream.

Abstract: A high pressure cutting arrangement is formed by combining a liquid stream, such as water, and a slurry stream, the slurry comprising abrasive particles suspended in a liquid. Energy is supplied to the liquid stream by a first energising means, such as a constant pressure pump. Energy is supplied to the slurry stream by a second energising means, such as by a piston powered by a constant volume pump. The liquid stream and the slurry stream are combined in a cutting tool, in which the supplied energy is converted to kinetic energy to produce a combined liquid and abrasive stream at high velocity.