Bosch Rexroth A2FM series - Working pressure range; Pressure at the working line ports A or B; Rate of pressure change RA max; Pressure definition

Bosch Rexroth AG, RE 91001-01-X-B2/01.2016
6 A2FM for explosive areas | Axial piston fixed motor
Working pressure range
Working pressure range
Pressure at the working line ports A or B Definition
Nominal pressure p
nom
400bar absolute The nominal pressure corresponds to the maximum design pressure.
Maximum pressure p
max
450bar absolute The maximum pressure corresponds to the maximum working pressure with‑
in the single operating period. The sum of the single operating periods must
not exceed the total operating period.
Single operating period 10s
Total operating period 300h
Minimum pressure (high‑pressure side) 25bar absolute Minimum pressure at the high‑pressure side (A or B) required to prevent
damage to the axial piston unit.
Minimum pressure – pump operating
mode (inlet)
See characteristic To prevent damage to the axial piston motor in pump mode (change of high‑
pressure side with unchanged direction of rotation, e.g. when braking),
aminimum pressure must be guaranteed at the working port (inlet).
Theminimum pressure depends on the rotational speed and displacement
of the axial piston unit.
Total pressure p
Su
(pressure A + pressure B)
700bar The summation pressure is the sum of the pressures at both work ports
(A and B).
Rate of pressure change R
Amax
Maximum permissible rate of pressure build‑up and reduction during
a pressure change across the entire pressure range.
with built‑in pressure relief valve 9000bar/s
without pressure relief valve 16000bar/s
▼ Rate of pressure change R
Amax
p
nom
∆t
∆p
Time t
Pressure p
▼ Pressure definition
t
1
t
2
t
n
Single operating
period
Pressure p
Minimum pressure (high‑pressure side)
Maximum pressure p
max
Nominal pressure p
nom
Time t
Total operating period = t
1
+ t
2
+ … + t
n
▼ Minimum pressure – pump operating mode (inlet)
Inlet pressure p
abs
[bar]
Rotational speed n / n
nom
1.00.80.60.4
0.2
0
1
2
4
6
8
10
12
V
g
This diagram is only valid for the optimum viscosity range
of ν
opt
=36 to 16mm
2
/s.
Please contact us if these conditions cannot be satisfied.
Note
Working pressure range valid when using hydraulic fluids
based on mineral oils. Values for other hydraulic fluids,
please contact us.