KNF has developed a new multi-diaphragm liquid pump, FP 150, offering greater pumping efficiency and flow rate, and less stress on system components.

FP 150 offers a linear flow adjustment from 0.2-1.5l/min, low pulsation and continuous duty up to 2-bar pressure.

Low pulsation is a key feature of the new FP 150.  By using five diaphragms to provide smooth laminar flow, pulsation values are typically below 150 mbar (at the pump outlet) at nominal flow rate, and lower still depending on system configuration and running speed. 

Further benefits include greater pumping efficiency, greater flow through the system at lower pressure, and no vibration of the pump and tubing. This last point results in less stress on system components. 

KNF noted that this means FP 150 fares just as well as gear pumps whilst offering the additional advantages of a diaphragm pump: self-priming, the ability to run dry, chemical and abrasion resistance, no contamination of media, gentle (low-shear) transfer of delicate media, stability with changing viscosity, no cavitation, long service life, etc.

Linear adjustment of the flow rate is another strong feature of the new FP 150.  The pump is driven by a five-wire brushless DC motor with integrated electronics offering linear speed control via either a 0-5V control voltage or an inverse PWM signal.  Thanks to the stability of the pump and the laminar flow it produces, the flow rate can be adjusted between 10-100% of the nominal flow rate with outstanding linearity.

FP 150 is also stable against back pressure (up to 2 bar) and, with a PTFE-coated diaphragm as standard (FFKM is an option on request) and a choice of FFKM or EPDM valves available, it can pump a wide range of challenging fluids.

KNF develops, produces and distributes high-quality diaphragm pumps and systems for gases, vapours and liquids, for use in a variety of applications and systems.

FP 150 is noted as one of the new generation diaphragm pumps from KNF combining the traditional advantages of diaphragm pump technology – self priming, can run dry, long life time – with a pulsation level comparable to gear pumps.

FP 150 is suitable for applications including medical devices, diagnostic instruments, laboratory equipment, industrial inkjet printing, semiconductor, fuels cell, and cleaning and disinfection.