Midland SPD-6 - Page 254

www.roadwidener.com
254
Model SPD-6
Required low pressure (minimum for extended usage)
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.
30bar
25bar
20bar
15bar
10bar
0
1000
2000
3000
4000
5000
6000
0 20 40 60 80 100
Speed [rpm]
Displacement [%]
30bar
25bar
20bar
15bar
10bar
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
0 20 40 60 80 100
Speed [rpm]
Displacement [%]
H1B060 Required Low Pressure (minimum for extended usage) H1B080 Required Low Pressure (minimum for extended usage)
H1B110 Required Low Pressure (minimum for extended usage) H1B160 Required Low Pressure (minimum for extended usage)
H1B250 Required Low Pressure (minimum for extended usage)
30bar
25bar
20bar
15bar
10bar
0
1000
2000
3000
4000
5000
6000
7000
8000
0 20 40 60 80 100
Speed [rpm]
Displacement [%]
30bar
25bar
20bar
15bar
10bar
0
1000
2000
3000
4000
5000
6000
7000
0 20 40 60 80 100
Speed [rpm]
Displacement [%]
30bar
25bar
20bar
15bar
10bar
0
1000
2000
3000
4000
5000
6000
7000
0 20 40 60 80 100
Speed [rpm]
Displacement [%]
P005 916
Max speed
Rated speed
Max speed
Rated speed
Max speed
Rated speed
Max speed
Rated speed
Max speed
Rated speed
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.
Service Manual H1B 060/080/110/160/250 Bent Axis Motors
Technical specifications
18 11024924 • Rev CB • February 2015