Table 4: Types of pumps in comparison
rotary pumps
chopper pumps
eccentric spiral
pump
rotary piston
pump
solids
content
<8%
<8%
< 15 %
< 15 %
energy
input
3 - 15 kW
3 - 15 kW
3 - 22 kW
3 - 20 kW
quantity
conveyed
2 - 6 m3/min
2 - 6 m3/min
0,3 - 3,5 m3/min 0,5 - 4 m3/min
pressure 0,8 - 3,5 bar
0,8 - 3,5 bar
< 25 bar
< 10 bar
structure of medium long
substrate fibers
long fibers
short fibers
medium long
fibers
max. size of
obstructive approx. 5 cm
elements
depending on
choppers
approx. 4 cm
approx. 6 cm
intake not sucking
not sucking
sucking
sucking
suitability
suitable for large
quantities; simple
and robust built
suitable for long-
fiber substrates
which need to be
chopped up.
Suitable for high
pressures, but
susceptible to
obstructive
bodies
higher pressures
than rotary
pumps, but higher
wear and tear
cheaper than
price positive
comparison displacement
pumps
depending on
choppers
similar to rotary
piston pump
similar to
eccentric spiral
pump
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