External-gear pump KF 2.5…630


for solvents, for coolant, for crude oil, for polyurethane, oil, grease, fuel oil, diesel fuel
for the pharmaceutical industry, industrial, chemical, for the mining industry, for the petrochemical industry, laboratory, for the printing industry, for the metallurgical industry, for maritime applications, for the steel industry, for the paper industry, for machine tools, for the nuclear industry, for the cosmetics industry, for the automotive industry, for the textile industry, for renewable energy
recirculation, transfer, for lubrication units, metering, process, conveying, for emulsions, high-temperature, for hazardous locations, for pumping stations, for cooling systems, for printing machines, for refrigeration, for lubrication systems, for power stations, for centralized lubrication systems
cast iron
Protection level
explosion-proof, ATEX
Other characteristics
multi-stage, low-noise, for fluids

Min.: 1.8 l/min (0.47551 us gal/min)

Max.: 713 l/min (188.35467 us gal/min)


Min.: 0 bar (0 psi)

Max.: 25 bar (362.594 psi)

Fluid temperature

Min.: -40 °C (-40 °F)

Max.: 200 °C (392 °F)


KF series gear pumps are external gear pumps that operate according to the positive displacement principle. Here, the fluid is transported from the suction to the discharge end by rotation of the two gear shafts in the tooth gaps along the housing wall.

The geometric displacement volume Vg is displaced per wheel revolution. A value that is stated in technical documentation as the nominal volume Vgn to identify the pump size.

Gear pumps are in principle self-priming – extremely high viscosities may require upstream pressure. The displacement cycle described initially takes place without exhibiting appreciable pressure build-up. Only after external loads have been specified, e.g. by delivery head, pressure drops, pipe elements, etc., is the working pressure required to overcome these resistances established.