4/20 Bosch Rexroth AG | Mobile Hydraulics A2FO | RE 91 401/09.00
Case drain pressure
Shaft seal ring FKM (fluor-caoutchouc)
The lower the speed and the case drain pressure the higher the life
expectation of the shaft seal ring. The values shown in the diagram
are permissible loads of the seal ring and shall not be exceeded.
With constant case pressure in the range of the max. permissible
case pressure a reduction of the life expectancy of the seal ring will
result.
For a short period (t < 5 min.) for the sizes 5…200 pressure loads up
to 5 bar independent from rotational speeds are permissible.
Sizes 10...200
Shaft seal ring NBR (nitril-caoutchouc) sizes 5...200
For seal rings of NBR 33% reduced values for the max. permissible
housing pressure p
abs.max.
are to be considered compared with seals
of FKM.
Special operation conditions may require limitations of these values.
Note:
-
maximum permissible pump speeds are given in the table on page 5
- max. perm. casing pressure p
abs. max
___ 10 bar (sizes 5...200)
___ 4 bar (sizes 250...1000)
- the pressure in the housing must be the same as or greater than
the external pressure on the shaft seal
Working pressure range inlet
Minimum pressure at port S
p
abs. min
_______________________________________________________________
0,8 bar
Working pressure range outlet
Maximum pressure at port A or B
(Pressure data to DIN 24312)
Size 5
Shaft end B Shaft end C
Nominal pressure p
N
210 bar 315 bar
Peak pressure p
max
250 bar 350 bar
Sizes 10...200
1
)
Shaft end A, Z
2
)
Shaft end B, P
Nominal pressure p
N
400 bar 350 bar
Peak pressure p
max
450 bar 400 bar
1
) Attention: shaft end Z and P with drives of radial force loads at
the drive shaft (pinion V-belt drives) necessitate reduction of the
nominal pressure to p
N
= 315 bar.
2) shaft end Z for size 56: p
N
= 350 bar, p
max
= 400 bar
Sizes 250...1000
Nominal pressure p
N
350 bar
Peak pressure p
max
400 bar
With pulsating loads above 315 bar we recommend using the model
with splined shaft, standard version A (sizes 10…200) or with splined
shaft Z (sizes 250…1000).
Long-Life bearings (L) (sizes 250...1000)
(for high life expectancy and use of HF-fluids)
The outer dimensions of the axial piston pumps are identical to
standard design (without long life bearings). The change from
standard design to long life bearing system is possible. We recommend
to apply bearing flushing at port U.
Temperature range of the shaft seal ring
The FKM shaft seal is admissible for a temperature range from
-25°C to +115°C. For applications below -25°C a NBR shaft seal is
necessary (admissible temperature range -40°C to +90°C) (special
design for sizes 250...1000).
Bearing flushing
For sizes 250...1000 bearing and housing flushing is possible through
port U.
Flushing flow (recommendation)
Size 250 355 500 710 1000
q
flush
(L/min) 10 16 20 25 25
Technical Data
Sizes 250...1000
speed n (rpm)
perm. pressure p
abs. max.
(bar)
7000 80005000 600040002000 30000 1000
1
2
3
4
5
6
7
8
9
10
sizes 10, 12, 16
sizes 23, 28, 32
size 45
sizes 56, 63
sizes 80, 90
sizes 107, 125
sizes 160, 180
size 200
perm. pressure p
abs. max.
(bar)
speed n (rpm)
3
2,5
2
1,5
1
0 1000750 2000
3,5
500250 1500 17501250
4
size 250
size 355
sizes 500
size 1000
sizes 710
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