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Text version of the page
100-P-000021-E-08/ 02.09
Internal Gear Pump QX
9/32
3.2.3 Pressure range 3
Volumetric efficiency
100
90
80
70
0 50 100 150 200 250 300 350 400
QX83
QX63
QX53
QX43
QX33
QX23
p [bar]
ē [%]
Overall efficiency
100
90
80
70
0 50 100 150 200 250 300 350 400
QX83
QX63
QX53
QX43
QX33
QX23
p [bar]
ē [%]
3.3 Operation with varialble-speed drives
3.3.1 Minimum speed as a function of pressure
Pump QX52-063 measured: with viscosity 42 mm2/s
300
250
200
150
100
50
0 100 200 300 400 500
p [bar]
n [rpm]
Continuous operation
Intermittent operation-
contact Bucher
3.3.2 Minimum pressure at suction port as a
function of Speed
Pump QX52-063 measured with viscosity 42 mm2/s
0,4
0,5
0,6
0,7
0,8
0,9
1,0
0 500 1000 1500 2000 2500 3000
p [bar], Inlet presure absolute
n [rpm]
Continuous operation
Operation prohibited
3.3.3 Typical loading cycle for a QX pump with variable-speed drive
Pump QX53-063 with separate drain connection measured with: viscosity 20 mm2/s
600
500
400
300
200
100
0
0 20 40 60 80 100
n [rpm]
t [s]
350
0 20 40 60 80 100
p [bar]
t [s]
0 20 40 60 80 100
35
30
25
20
15
10
5
0
Pressure holding Q = 0 l/min
Q [l/min]
t [s]