Operating Pressure Range - Bosch Rexroth A6VM series 71 Manual

Operating pressure range

Pressure at working port A or B
Nominal pressure p
nom
Maximum pressure p
max
Single operating period
Total operating period
Minimum pressure
(high-pressure side)
Minimum pressure – pump operating
mode (inlet)
Summation pressure p
Su
(pressure A + pressure B)
Rate of pressure change R
A max
With integrated pressure-relief valve 130530 psi/s (9000 bar/s)
Without pressure-relief valve
▼ Rate of pressure change R
p
nom
∆t
∆p
Time t
▼ Pressure definition
Single operating period
Maximum pressure p
max
Nominal pressure p
nom
Minimum pressure (high-pressure side)
Time t
Total operating period = t
6500 psi (450 bar)
7250 psi (500 bar)
10 s
300 h
365 psi (25 bar)
See the diagram below
10150 psi (700 bar)
232060 psi/s (16000 bar/s)
A max
t
2
t t
n
1
+ t + ... + t
1 2 n
Axial piston variable motor | A6VM series 71
Definition
The nominal pressure corresponds to the maximum design pressure.
The maximum pressure corresponds to the maximum operating pres-
sure within the single operating period. The sum of the single operating
periods must not exceed the total operating period.
Minimum pressure at the high-pressure side (A or B) which is required
in order to prevent damage to the axial piston unit.
To prevent damage to the axial piston motor in pump operating mode
(change of high-pressure side with unchanged direction of rotation, e. g.
when braking), a minimum pressure must be guaranteed at working port
(inlet). This minimum pressure is dependent on the speed and displace-
ment of the axial piston unit (see characteristic curve)
The summation pressure is the sum of the pressures at both working
ports (A and B)
Maximum permissible rate of pressure build-up and reduction during a
pressure change over the entire pressure range.
▼ Minimum pressure – pump operating mode (inlet)
230 (16)
200 (14)
175 (12)
145 (10)
115 (8)
90 (6)
60 (4)
30 (2)
15 (1)
0 0.4
This diagram is valid only for the optimum viscosity range
from = 170 to 73 SUS (36 to 16 mm
ν
opt
Please contact us if these conditions cannot be satisfied.
Note
Operating pressure range valid when using hydraulic
fluids based on mineral oils. Values for other hydraulic
fluids, please contact us.
Operating pressure range
V
g max
V
g x
0.3 V
0.7 1.0 1.3
Rotational speed n / n
nom
2 /s).
RE-A 91610/12.2015, Bosch Rexroth Corp.
7
g max
1.6