Required Low Pressure Diagrams (Minimum For Extended Usage) - Danfoss H1 Series Technical Information

Technical Information
H1 Bent Axis Variable Displacement Motors, Size 060/080/110/160/210/250
Technical specifications

Required low pressure diagrams (minimum for extended usage)

Speed (rpm) and Pressure (bar) versus Displacement (%)
8000
7000
6000
5000
4000
3000
2000
1000
0
0% 20% 40%
7000
6000
5000
4000
3000
2000
1000
0
0% 20% 40%
6000
5000
4000
3000
2000
1000
0
0% 20% 40%
Bold dashed line: Maximum speed / Bold solid line: Rated speed
These minimum pressures are required for a high duty cycle, defined as 200 hours at 350 bar. Similarly, a duty cycle of 200 hours at 250
bar requires 50% of these pressures.
This low pressure (above case pressure) is required to prevent cavitation, which comes from the pressure change in the cylinder block.
There is very high flow velocity in the porting grooves of the valve segment, which causes cavitation.
For open circuit applications it is not allowed to operate above rated speed. For closed circuit applications operating between rated
and max speed, and for specific duty cycle interpretation or analysis, please contact your local Danfoss Power Solutions representative.
16 | © Danfoss | December 2016
H1B 060
30 bar
25 bar
20 bar
15 bar
10 bar
60% 80% 100%
P006 022
H1B 110
30 bar
25 bar
20 bar
15 bar
10 bar
60% 80% 100%
P006 024
H1B 210
30 bar
25 bar
20 bar
15 bar
10 bar
60% 80% 100%
P006 026
8000
7000
6000
5000
4000
3000
2000
1000
0
0% 20% 40%
7000
6000
5000
4000
3000
2000
1000
0
0% 20% 40%
6000
5000
4000
3000
2000
1000
0
0% 20% 40%
H1B 080
60% 80% 100%
P006 023
H1B 160
60% 80% 100%
P006 025
H1B 250
60% 80% 100%
P006 027
11037153 | BC00000043en-US1103
30 bar
25 bar
20 bar
15 bar
10 bar
30 bar
25 bar
20 bar
15 bar
10 bar
30 bar
25 bar
20 bar
15 bar
10 bar