Charge Pump Selection
In most applications a general guideline is that the charge pump displacement should be at least 10% of
the total displacement of all components in the system. Unusual application conditions may require a
more detailed review of charge flow requirements. System features and conditions which may invalidate
the 10% guideline include (but are not limited to):
•
Continuous operation at low input speeds < 1500 min
-1
(rpm)
•
High shock loading and/or long loop lines
•
High flushing flow requirements
•
Multiple low speed high torque motors
•
High input shaft speeds
Contact your Danfoss representative for application assistance if your application includes any of these
conditions.
Charge Pump Curves, Size 26/34 cm³
The curves shown below at the following conditions:
Charge pressure
20 bar [290 psi]
Viscosity
11 mm²/s [63 SUS]
Temperature
80 °C [176 °F]
Charge pump flow
P003 335E
0
500
1500
1000
2000
Speed min
-1
(rpm)
3000
2500
3500
100
27
24
21
18
15
12
9
6
3
1
90
80
70
60
50
40
30
20
10
0
l/min
US gal/min
34 cm
3
[2.07 in
3
/r
ev]
26 cm
3
[1.59 in
3
/r
ev]
Charge pump power requirements
P003 337E
14.0
10
9
8
7
6
5
4
3
2
1
0
13.0
12.0
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
HP
Kw
34 cm
3
[2.07 in
3
/r
ev]
26 cm
3
[1.59 in
3
/r
ev]
0
500
1500
1000
2000
Speed min
-1
(rpm)
3000
2500
3500
Technical Information
H1 Axial Piston Single Pumps, Size 115/130
Technical specifications
©
Danfoss | May 2017
11063346 | BC00000198en-US0801 | 9