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New KNF FP 400 Low Pulsation Diaphragm Pump

The FP 400 is a next-generation diaphragm pump from KNF. It combines the traditional advantages of diaphragm pump technology — self priming, the ability to run dry, and long, maintenance-free lifetime under continuous-operation conditions — with a pulsation level comparable to gear pumps 

Low Pulsation

Pulsation for new FP 400 is less than 150 mbar. Levels far below this are achievable, depending on system tubing hardness, tubing inside diameter, and flow path length/configuration. The pump delivers up to 5 L/min of liquid at back pressures to 14.5 psig, with complete linear control of flow between 10% and 100% of the nominal flow rate. Pump flow is fully stable with fluid viscosities ranging between 1 and 150 cSt. The pump handles viscosities up to 500 cSt with some flow rate reduction.

Low Shear

KNF designed the FP 400 specifically to provide gentle, low-shear conveyance of sensitive media. Other strengths of this innovative new pump include very low vibration, a noise level below 55 dBA, chemically resistant flow path material options for use with aggressive media, and an IP65 protection rating. 

Application Benefits

The many benefits of FP 400 make it particularly well suited for recirculation applications in a diverse set of markets, including: 

Inkjet Printing: UV, water-based, and solvent ink recirculation to prevent pigment precipitation; ink temperature management; and meniscus control. Glaze, varnish, and hot-melt recirculation. Major global printer and ink manufacturers have already tested the FP 400 intensively for 18 months, raising much interest.

Medical Device: Temperature management, including aesthetic laser cooling systems.

Semiconductor: Temperature management/cooling, particularly in systems with sensors sensitive to pulsation.

Fuel Cells: Fuel recirculation and membrane hydration.

 

 

Features and Benefits

Low pulsation is a key feature of the FP 400 since it achieves values lower than 150 mbar (at the pump outlet) at nominal flow rate and lower still depending on system configuration and running speed.  In this respect the FP 400 fares just as well as gear pumps used in industrial Ink Jet Printing (IJP).
 
Linear adjustment of flow is another strong feature of the FP 400. The pump offers outstanding linearity between 10% and 100% of the nominal flow rate.
 
On top of that, the pump is stable against back pressure (up to 1 bar) and against viscosity changes within the range of the most common inks used in industrial IJP; making the FP 400 a good solution for applying glazes, enamels, hot melt inks, etc.
 
Additionally, the FP 400 has been extensively market-tested for more than 18 months at major printer and ink manufacturers in Italy, Spain, Germany, UK and China with much success.

Applications

The FP 400 pump has been specially designed to meet the challenges posed by UV inks which are currently witnessing substantial growth across a range of applications in industrial Inkjet Printing (IJP). The five diaphragms of the FP 400 apply a low shear force to UV inks, thus avoiding premature curing – i.e. activating the UV initiators - in the pump.

The FP 400 delivers 4 to 5 l/min (depending on version) to meet the higher recirculation volumes required by modern printing equipment which utilize a greater number (up to 36) of print heads per color bar. These new and bigger printers are the solutions found in industries for packaging, laminates, textiles, wallpaper, ceramics, glass, metals and wood.  Furthermore, the FP 400 is ideally suited to the new High Laydown (HL) technology in the industrial ink jet market which requires much higher recirculation flow rates.

Non-Printing Applications

Medical Device: Temperature management, including aesthetic laser cooling systems.

Semiconductor: Temperature management/cooling, particularly in systems with sensors sensitive to pulsation.

Fuel Cells: Fuel recirculation and membrane hydration.