High Performance Rotary Screw Pumps

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Rotary Screw Pumps have ex-isted for many years and aremanufactured around theworld. More demanding ser-vice requirements impose chal-lenges on Screw pump manu-factures to provide higher pres-sure or flow capability, betterwear resistance, improved cor-rosion resistance and lowerleakage emissions. Bettermaterials and more precisemachining techniques as wellas engineering innovation haveled to improvements in all first Screw pump built wasprobably of an Archimedesdesign used to lift large vol-umes of water small verticaldistances; they are still manu-factured and used for this ser-vice. Today s three Screw highperformance pump can deliverliquids to pressures above 300Bar and flows to 750 m3/h withlong term reliability and excel-lent efficiency.

High pressure pumps may have as many as 12 stages while low pressure pumps may have only two or three. Because the center screw is performing all

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