Pump types - fixed or intensifier?

• Fixed displacement piston pump. This type of pump, as used in some entry level machines, uses a set of high speed pistons driven directly by an electric motor to compress the water and generate the pressure. This type of pump develops a cutting pressure of 1500 - 2000 bar which is adequate for an entry level machine. It also has the advantage of being cheap to manufacture - resulting in prices as low as £45,000 for an abrasive water jet cutter.

• Intensifier Pump. This type of pump uses hydraulic pressure developed by an electric motor driving a hydraulic pump, which in turn drives a single piston backwards and forwards in a long slow stroke, compressing the water and developing pressures up to 4100 bar. This type is the most common type found on water jet machines.

Principles continued. Nozzle and focusing tube choice.