Screw pumps offer advantages such as stable flow rate, low pressure pulsation, strong self-priming capability, low noise, high efficiency, long service life, reliable operation, compact structure, few parts, and easy maintenance. Their outstanding advantage is that they do not form eddies when conveying media and are insensitive to the viscosity of the media.
Screw pumps have a wide performance range, with flow rates from 0 to over 2000 m³/h, and pressure ranges from 0.6 MPa to 22 MPa, with some models reaching 100 bar or higher. They can handle a wide range of media viscosities, for example from 5 to 100,000 mm²/s, with some models even reaching tens of thousands to hundreds of thousands of centipoises. The maximum temperature of the conveyed media can reach 300℃.
Screw pumps have extremely wide media adaptability, capable of conveying high-viscosity media, media containing particles or fibers (particle diameter up to 30 mm, fiber length up to 350 mm), shear-sensitive media, and liquids with varying lubricity. Twin-screw pumps can also handle various lubricated or non-lubricated, high or low viscosity liquids, gases, and media containing small amounts of particles.
Compared to centrifugal pumps, screw pumps have superior self-priming capabilities; compared to piston pumps, screw pumps require no valves, offer stable pressure, and provide a stable linear flow; compared to gear pumps, screw pumps can handle materials with higher viscosity; and compared to diaphragm pumps, screw pumps can transport media containing various mixtures of impurities, including gases, solid particles, and fibers.
Screw pumps operate smoothly with low vibration and low noise; as positive displacement pumps, they have high volumetric efficiency, ideally reaching ≥92%.
