Stationary and mobile installations and apparatus, namely, machines for water jet cutting in particular for water abrasive and/or water abrasive suspension cutting; water jet cutting machines in particular for water abrasive and/or water abrasive suspension cutting; valves as machine components; nozzles as machine parts, namely, swirl nozzles, cutting nozzles, discharge nozzles for discharging liquids, liquids with added abrasive and water suspensions, in particular water abrasive suspensions...