Controllers devices

DR, DP, FR and DFR for

Variable axial piston pump RE 92060
A4VSO  Edition: 01.2017
Replaces: 04.2014

▶▶ For variable pump A4VSO series 1 and 3

▶▶ Open circuit

Features Contents
▶▶ Control of pressure and flow Ordering code – A4VSO 2
▶▶ Remote controlled optional DR − pressure controller 3
▶▶ Pressure controller for parallel operation optional DRG − remote controlled pressure controller 6
▶▶ Mechanical Vg min − and Vg max −limitation DP − pressure controller for parallel operation 11
▶▶ The special version enables mooring, swivel-through DPF − with flow controller 16
operation, and decompression over the pump FR/FR1 − flow controller 19
FRG/FRG1 − flow controller with remote
Variable pump A4VSO, data sheet 92050 controlled pressure control 22
DFR/DFR1 − pressure-flow controller 25
General instructions 28

 RE 92060/01.2017, Bosch Rexroth AG

2 DR, DP, FR and DFR | Controllers
Ordering code – A4VSO

Ordering code – A4VSO

01 02 03 04 05 06 07 08 09 10 11 12 13
A4VS O / –

Hydraulic fluid
01 For details see data sheet 92050

Axial piston unit

02 Swashplate design, variable A4VS

Charge pump (impeller)

03 without charge pump (no symbol) ● ● ● ● ● ● ● ● ●
with charge pump (impeller)
‒ ‒ ‒ ‒ ‒ ‒ ‒ ● ‒ L
only with port plate 25 (service line ports)

Operating mode
04 Pump, open circuit O

Size (NG)
05 Geometric displacement 40 71 125 180 250 355 500 750 1000

Control device
06 Pressure controller DR ● ● ● ● ● ● ● ● ● DR1)
remote controlled DR G ● ● ● ● ● ● ● ● ● DRG1)
Pressure control for parallel operation DP ● ● ● ● ● ● ● ● ● DP1)
with flow control DP F ‒ ‒ ● ● ● ● ‒ ‒ ‒ DPF
Flow controller FR ● ● ● ● ● ● ‒ ‒ ‒ FR
with pressure control, remote controlled FR G ● ● ● ● ● ● ‒ ‒ ‒ FRG
FR no connection from XF to the tank FR 1 ● ● ● ● ● ● ‒ ‒ ‒ FR1
FRG no connection from XF to the tank FRG 1 ● ● ● ● ● ● ‒ ‒ ‒ FRG1
Pressure and flow controller DFR ● ● ● ● ● ● ‒ ‒ ‒ DFR
no connection from XF to the tank DFR 1 ● ● ● ● ● ● ‒ ‒ ‒ DFR1

Series
07 Series 1, index 0 ● ● ‒ ‒ ‒ ‒ ‒ ‒ ‒ 10
Series 3, index x ‒ ‒ ● ● ● ● ● ● ● 3x

For details see data sheet 92050

08 Direction of rotation
09 Seal
10 Drive shaft
11 Mounting flange
12 Service line ports
13 Through drive

● = Available ‒ = Not available

1) Available in mooring and swivel-through operation on request

Bosch Rexroth AG, RE 92060/01.2017

Controllers | DR, DP, FR and DFR 3
 DR − pressure controller

DR − pressure controller

The pressure controller limits the maximum pressure at the ▼▼ Static characteristic

pump outlet within the control range of the variable pump.

The variable pump only moves as much hydraulic fluid as is
350

Pressure deviation ≤ 3 bar

required by the consumers. If the operating pressure

Operating pressure p [bar]

exceeds the pressure setting at the pressure control valve,
the pump will regulate to a smaller displacement to reduce
the control differential.
▶▶ Recommended setting range 50 to 350 bar.
350 bar is set as standard.
When ordering, please state other values in plain text.
▶▶ Initial position in depressurized state: Vg max 50
▶▶ Mechanical minimum and maximum swivel angle limita-
qv min Flow qv max
tion
–– The Vg min stop is set so that a pressure of 15 to
A4VSO - open circuit
20 bar is set when port B is plugged.
▼▼ Flow direction S to B
–– The Vg max stop is set to nominal Vg max. When order-
ing, please state other settings values in plain text Direction of rotation Swiveling range1) High pressure port
(possible setting ranges Vg max to 50 % Vg max). Pump

The pressure controller for mooring and swivel-through clockwise left B

operation is available on request. For decompression, the
counter-clockwise right B
pump swivels over zero in operation as a motor.
1)
cf. swivel angle indicator

15 0 15
right
Remote controlled pressure control optionally available – left

DRG see page 6, pressure controller for parallel operation

DP see page 11

 RE 92060/01.2017, Bosch Rexroth AG

4 DR, DP, FR and DFR | Controllers
Ordering code – A4VSO

Dynamic characteristics Swivel times

Load step by opening and closing a pressure line with a NG tSA [s] tSA [s] tSE [s]
pressure-relief valve as load valve 1 m after the connection against 20 bar against 330 bar zero stroke 350 bar
flange of the axial piston unit. 40 approx. 0.12 approx. 0.08 0.02
71 approx. 0.20 approx. 0.10 0.03
400
125 approx. 0.30 approx. 0.20 0.04
Operating pressure p [bar]

350 180 approx. 0.30 approx. 0.20 0.05

300 250 approx. 0.40 approx. 0.30 0.06
355 approx. 0.40 approx. 0.30 0.08
200 500 approx. 0.50 approx. 0.30 0.10
750 approx. 1.00 approx. 0.60 0.15

100 1000 approx. 1.50 approx. 0.90 0.20

The values of the outward swivel time tSA (Vg min → Vg max)
0 can be shortened by the factor 2 to 3 if required (please
V g max contact us).
This does not have any effect on the inward swivel time tSE .
(swivel angle)
Displacement

V g min

Swivel time t

Outward swivel time tSA Inward swivel time tSE

Note
Characteristics are measured median values at:
▶▶ n = 1500/1800 rpm
▶▶ Pressure safeguarding at 400 bar

Bosch Rexroth AG, RE 92060/01.2017

Controllers | DR, DP, FR and DFR 5
 Ordering code – A4VSO

DR schematics
Controller range (gray field) applicable for A4VSO

▼▼ Example A4VSO, sizes 40 and 71 ▼▼ Example A4VSO, sizes 125 to 355

2
2

B1 B MB B1 B MB 3

1.1 1.1

U S MS K1 K2 T R(L) U S MS M1 K1 K2 T R(L) M2

▼▼ Example A4VSO, sizes 500 to 1000

3
M2
B1 B MB M1

1.1

U S MS K1 K2 T R(L)

Components
1 Pump with hydraulic control device
1.1 A4VSO (see data sheet 92050)
2 Pressure control valve
3 Intermediate plate (NG 125 to 1000)

 RE 92060/01.2017, Bosch Rexroth AG

6 DR, DP, FR and DFR | Controllers
DRG − remote controlled pressure controller

DRG − remote controlled pressure controller

Function and equipment as for DR. Note for setting the remote controlled pressure control:
A pressure-relief valve (pos.4) can be piped externally at The setting value for the external pressure relief valve plus
port XD for remote control, although the pressure-relief the differential pressure value at the pressure control valve
valve is not included in the scope of supply for the DRG determines the level of pressure control.
control. Example: External pressure relief valve 330 bar
Version with built-on valve on request. Differential pressure at pressure
control valve 20 bar
The differential pressure at the pressure control valve Pressure control at 330 + 20 = 350 bar
(pos.2) is set to 20 bar as standard, the quantity of control
liquid emerging at port XD is then approx. 1.5 l/min. If a max.350
different setting (recommended range 20 to 50 bar) is

Operating pressure p [bar]

Pressure deviation ≤ 3 bar

required, please state in plain text.

External pressure-
As a separate pressure-relief valve, we recommend:
relief valve
▶▶ DBD 6 (hydraulic) as per data sheet 25402.
▶▶ DBETA-6X (elektrical) as per data sheet 29262.
The maximum wire length should not exceed 2 m. Δp pressure control valve
20

qv min Flow qv max

For the function, description, and swivel times of the pres-

sure controller DR, see pages 3 and 4.

Bosch Rexroth AG, RE 92060/01.2017

Controllers | DR, DP, FR and DFR 7
 DRG − remote controlled pressure controller

DRG schematics
Controller range (gray field) applicable for A4VSO

▼▼ Example A4VSO, sizes 40 and 71 ▼▼ Example A4VSO, sizes 125 to 355

2
2 4
XD
4
XD

B1 B MB B1 B MB 3

1.1 1.1

U S MS K1 K2 T R(L) U S MS M1 K1 K2 T R(L) M2

▼▼ Example A4VSO, sizes 500 to 1000

XD
2

B1 B MB 3 M2
M1

1.1

U S MS K1 K2 T R(L)

Components
1 Pump with hydraulic control device
1.1 A4VSO (see data sheet 92050)
2 Pressure control valve
3 Intermediate plate (NG 125 to 1000)
4 External pressure-relief valve
(not included in the scope of supply)

 RE 92060/01.2017, Bosch Rexroth AG

 Dimensions [mm]
8 DR, DP, FR and DFR | Controllers
DRG − remote controlled pressure controller

Dimensions DR / DRG

▼▼ A4VSO, sizes 40 and 71

A7
XD
A2 Pressure control valve

A8
B
Pressure control valve mounting
for clockwise rotation

XD

A3
A5
15 0 15
LR
A1

Einschraubloch M33

A6
R(L)
A4

B (XD for counter-clockwise

rotation)
(Pressure control valve mounting
for counter-clockwise rotation)

NG1) A1 A2 A3 A4 A5 A6 A7 A8
40 260 140 147 137 47 67 209 128 For detailed dimensions and technical data of the
71 298 157 142 142 42 72 236 144 v­ ariable pump, see data sheet 92050 (A4VSO)

Port Standard Size2) pmax abs [bar]3) State4)

XD (DRG) Pilot pressure remote control DIN 3852 M14 x 1.5; 12 deep 400 O
­pressure controller
XD (DR) X

1) For sizes 500 to 1000 see page 10 4) O = Must be connected (plugged on delivery)
2) For notes on tightening torques, see the instruction manual X = Plugged (in normal operation)
3) Momentary pressure spikes may occur depending on the application.
Keep this in mind when selecting measuring devices and fittings.

Bosch Rexroth AG, RE 92060/01.2017

Dimensions [mm]
Controllers | DR, DP, FR and DFR 9
 DRG − remote controlled pressure controller

▼▼ A4VSO, sizes 125 to 355

A7
Intermediate plate

XD Pressure control valve

A2

A8
B

M2(M1) Pressure control valve mounting

for clockwise rotation

XD
A5
A1

LR
15 0 15

Einschraubloch M33
A6

R(L)
(XD for counter-clockwise rotation)
B
(Pressure control valve mounting
M1(M2) for counter-clockwise rotation)

NG1) A1 A2 A5 A6 A7 A8
125/180 354 191 41 71 305 172 For detailed dimensions and technical data of the variable pump, see data
250/355 424 238 41 71 367 208 sheet 92050 (A4VSO)

Port Standard Size2) pmax abs [bar]3) State4)

XD (DRG) Pilot pressure remote control DIN 3852 M14 x 1.5; 12 deep 400
O
pressure controller
XD (DR) X
M1; M2 Measurement of stroking chamber DIN 3852 M14 x 1.5; 12 deep (NG 125 and 180) 400 X
pressure M18 x 1.5; 12 deep (NG 250 and 355) X

1) For sizes 500 to 1000 see page 10 4) O = Must be connected (plugged on delivery)
2) For notes on tightening torques, see the instruction manual X = Plugged (in normal operation)
3) Momentary pressure spikes may occur depending on the application.
Keep this in mind when selecting measuring devices and fittings.

 RE 92060/01.2017, Bosch Rexroth AG

 Dimensions [mm]
10 DR, DP, FR and DFR | Controllers
DRG − remote controlled pressure controller

▼▼ A4VSO, sizes 500 to 1000

Intermediate plate
A7

Pressure control valve

XD
A2

A8
B

M2(M1)
Pressure control valve mounting
for clockwise rotation

XD

A5
A1

LR
15 0 15

Einschraubloch M33
A6

R(L)

(XD for counter-clockwise rotation)

(Pressure control valve mounting

B for counter-clockwise rotation)

M1(M2)

NG1) A1 A2 A5 A6 A7 A8
500 510 283 41 51 452 216 For detailed dimensions and technical data of the variable pump, see data
750 582 322 41 51 484 235 sheet 92050 (A4VSO)

1000 622 350 41 51 550 269

Port Standard Size2) pmax abs [bar]3) State4)

XD (DRG) Pilot pressure remote control pressure DIN 3852 M14 x 1.5; 12 deep 400 O
controller
XD (DR) X
M1; M2 Measurement of stroking chamber DIN 3852 M14 x 1.5; 12 deep 400 X
pressure

1) For sizes 40 and 71 see page 8; for sizes 125 to 355 see page 9 3) Momentary pressure spikes may occur depending on the application.
2) For notes on tightening torques, see the instruction manual. Keep this in mind when selecting measuring devices and fittings.
4) O = Must be connected (plugged on delivery)
X = Plugged (in normal operation)

Bosch Rexroth AG, RE 92060/01.2017

Controllers | DR, DP, FR and DFR 11
 DP − pressure controller for parallel operation

DP − pressure controller for parallel operation

Suitable for pressure control of multiple axial piston units The DP controller for mooring and swivel-through operation
A4VS in parallel operation. is available on request. For decompression, the pump
An external pressure-relief valve (pos. 4) actuates multiple swivels over zero in operation as a motor.
axial piston units together over ports XD. The respective
throttle valve (Pos. 5) provides the pressure increase pro- Swivel times as for DR, see page 4.
portional to the current pump setting that is required for Flow control is optionally available – DPF see page 18
parallel control.
100%
▶▶ Initial position in depressurized state: Vg max

10%
Swivel angle a
Differential pressure setting on the controller
The control valve (pos. 2) plus throttle valve (pos. 5) is set
to 33 bar when the XD port is relieved. The quantity of
control liquid emerging at port XD is then approx. 1.5 l/min.
The setting value for the external pressure relief valve plus
the basic setting of the controller determines the level of 0
pressure control. qv min qv max
▶▶ Adjustment range 33 to 350 bar Flow

The pressure increase is retained independently of the

setting value of the external pressure-relief valve and Swivel angle deviation ± 10 % from the setpoint value
ensures the swivel angle deviation is low for all mutually
activated pumps.
▼▼ Static characteristic
Use the same as possible line lengths from ports XD to the
pressure-relief valve.
350

The pressure-relief valve (Pos. 4) is not included in the

Operating pressure

scope of supply of the DP - please order separately.

Δp = 6.5±2 bar
p [bar]

▶▶ Recommendation:
DBD 6 (hydraulic) as per data sheet 25402
or DBETA-6x (elektrical) as per data sheet 29262 at
maximum 3 pumps.

33
▶▶ Mechanical minimum and maximum swivel angle limita-
tion
qv min Flow qv max
–– The Vg min stop is set so that a pressure of 15 to
20 bar is set when port B is plugged.
–– The Vg max stop is set to nominal Vg max. When ordering, A4VSO - open circuit
please state other settings requests in plain text (pos- ▼▼ Flow direction S to B
sible setting ranges Vg max to 50 % Vg max). Direction of rotation Swiveling range1) High-pressure port
The maximum number of pumps is limited by the output of pump
the used pressure-relief valve (pos. 4).
clockwise left B
Single pumps can be relieved to the amount of the basic
setting by the relief valve (pos. 6) as required. A check valve counter-clockwise right B

(pos. 7) is then additionally needed at the pressure port. 1)

cf. swivel angle indicator
Both valves are not included in the scope of supply.
Special version with mounted relief valve (pos. 6) is avail- right
15 0 15

left
able on request.

 RE 92060/01.2017, Bosch Rexroth AG

12 DR, DP, FR and DFR | Controllers
DP − pressure controller for parallel operation

DP schematics
Controller range (gray field) applicable for A4VSO

▼▼ Example A4VSO, sizes 40 and 71

Connection
of further
4 axial piston
units
Mst Mst
XD 6 XD 6
7 7
5 2 5 2
B1 B MB B1 B MB

1.1 1.1

U S MS K1 K2 T R(L) M2 U S MS K1 K2 T R(L) M2

▼▼ Example A4VSO, sizes 125 to 355

Connection
of further
4 axial piston
units
Mst Mst
XD 6 XD 6
7 7
5 2 5 2
B1 B MB B1 B MB

1.1 1.1

U S MS K1 K2 T R(L) M2 U S MS K1 K2 T R(L) M2

Port
XD Pilot pressure pressure controller
MSt Pilot pressure measurement
M1, M2 Measurement stroking chamber pressure (NG 125 to 1000)

Bosch Rexroth AG, RE 92060/01.2017

Controllers | DR, DP, FR and DFR 13
 DP − pressure controller for parallel operation

▼▼ Example A4VSO, sizes 500 to 1000

Connection
of further
4 axial piston
units
Mst Mst
6 6
XD XD

7 7
2 2
5 5
B1 B MB M2 B1 B MB M2
M1 M1
3 3

1.1 1.1

U S MS K1 K2 T R(L) U S MS K1 K2 T R(L)

Port
XD Pilot pressure pressure controller
MSt Pilot pressure measurement
M1, M2 Measurement of stroking chamber pressure

Components
1 Pump with hydraulic control device
1.1 A4VSO (see data sheet 92050)
2 Control valve with pressure compensator
3 Intermediate plate (NG 500 to 1000)
4 Pressure-relief valve (not included in the scope of supply)
5 Throttle valve
6 Relief valve (not included in the scope of supply)
7 Check valve (not included in the scope of supply)
only required in combination with relief valve

 RE 92060/01.2017, Bosch Rexroth AG

 Dimensions [mm]
14 DR, DP, FR and DFR | Controllers
DP − pressure controller for parallel operation

Dimensions DP

▼▼ A4VSO, sizes 40 and 71 ▼▼ A4VSO, sizes 125 to 355

A6 to flanging face
A6 to flanging face
XD 5 5
XD
3

1.1 2 1.1 2
A2

A2
A7

A7
B B
Control valve mounting Control valve mounting
for clockwise rotation for clockwise rotation
M2(M1)

XD XD
A3
M14x1.50

M14x1.50

M14x1.50
M14x1.50
A5

A5
A1

LR
15 0 15

LR
A1

15 0 15

Einschraubloch M33

Einschraubloch M33

R(L)
A4

MSt R(L) MSt

Schl.weite: 30 mm

B B
M1(M2)
(Control valve mounting
(Control valve mounting for counter-clockwise
for counter-clockwise rotation)
rotation)

NG A1 A2 A3 A4 A5 A6 A7
40 260 210 147 137 39 133 170 For detailed dimensions and technical data of the variable pump,
71 225 225 142 142 39 155 187 see data sheet 92050 (A4VSO)

125/180 354 261 – – 39 192 221

250/355 424 306 – – 39 237 268

Port Standard Size2) pmax abs [bar]3) State4)

XD Pilot pressure pressure controller DIN 3852 M14 x 1.5; 12 deep 400 O
MSt Measurement of stroking chamber DIN 3853 S8 shape W 400 X
pressure
M1; M2 Measurement of stroking chamber DIN 3852 M14 x 1.5; 12 deep (NG 125 and 180) 400 X
pressure M18 x 1.5; 12 deep (NG 250 and 355) X
Components, see page 13
1) For notes on tightening torques, see the instruction manual 3) O = Must be connected (plugged on delivery)
2) Momentary pressure spikes may occur depending on the application. X = Plugged (in normal operation)
Keep this in mind when selecting measuring devices and fittings.

Bosch Rexroth AG, RE 92060/01.2017

Dimensions [mm]
Controllers | DR, DP, FR and DFR 15
 DP − pressure controller for parallel operation

▼▼ A4VSO, sizes 500 to 1000

A6 to flanging face

5
XD
3 2
1.1
A2

A7
MSt

Control valve mounting

for clockwise rotation
XD M2(M1)
A1
A5

LR
15 0 15

Einschraubloch M33

R(L)

MSt Components
1 Pump with hydraulic control device
B 1.1 A4VSO (see data sheet 92050)
M1(M2) 2 Control valve with pressure compensator
(Control valve mounting for 3 Intermediate plate (NG 125 to 1000)
counter-clockwise rotation) 5 Throttle valve

NG A1 A2 A5 A6 A7
500 510 353 39 268 313 For detailed dimensions and technical data of the variable pump, see data sheet
750 582 392 39 290 352 92050 (A4VSO)

1000 622 419 39 349 379

Port Standard Size1) pmax abs [bar]3) State3)

XD Pilot pressure pressure controller DIN 3852 M14 x 1.5; 12 deep 400 O
MSt Pilot pressure measurement DIN 3853 S8 shape W 400 X
M1; M2 Measurement of stroking chamber DIN 3852 M14 x 1.5; 12 deep 400 X
pressure

1) For notes on tightening torques, see the instruction manual 3) O = Must be connected (plugged on delivery)
2) Momentary pressure spikes may occur depending on the application. X = Plugged (in normal operation)
Keep this in mind when selecting measuring devices and fittings.

 RE 92060/01.2017, Bosch Rexroth AG

16 DR, DP, FR and DFR | Controllers
DPF − with flow controller

DPF − with flow controller

In addition to the pressure control function, a differential A4VSO - open circuit

pressure can be used to control the flow from the pumps,
e. g. by an orifice between the pump and consumer. The ▼▼ Static characteristic

pump supplies only the amount of fluid actually required by

the consumer. 350
The flow of the pump is then dependent on the cross sec-

Operating pressure
tion of the external measuring orifice (pos. 9), which is

Δp = 6.5±2 bar
located between the pump and the consumer. The flow is

p [bar]
nearly independent of the load pressure below the setting
value of the pressure control and within the control range
of the pump.
For a description of the flow controller, see FR page 19.
33
For the function and technical data of the parallel pressure
controller DP, see page 11.
qv min Flow qv max

▼▼ Flow direction S to B

Direction of rotation Swiveling range1) High-pressure port

pump

clockwise left B
counter-clockwise right B
1)
cf. swivel angle indicator
right

15 0 15
left

Bosch Rexroth AG, RE 92060/01.2017

Controllers | DR, DP, FR and DFR 17
 DPF − with flow controller

DPF schematics

▼▼ A4VSO, size 125 to 355

9 Connection
of further
4 pumps

Mst Mst
XF 6 XF 6

8 8
7 XD 7 XD

5 2 5 2

B1 B MB 3 B1 B MB 3

1.1 1.1

U S MS M1 K1 K2 T R(L) M2 U S MS M1 K1 K2 T R(L) M2

Port
XD Pilot pressure pressure controller
XF Pilot pressure flow controller
MSt Pilot pressure measurement
M1, Measurement of stroking chamber pressure
M2

Components
1 Pump with hydraulic control device
1.1 A4VSO (see data sheet 92050)
2 Control valve with pressure compensator
3 Intermediate plate
4 Pressure-relief valve (not included in the scope of supply)
5 Throttle valve
6 Relief valve (not included in the scope of supply)
7 Check valve (not included in the scope of supply)
only required in combination with relief valve
8 Flow control valve
9 External measuring orifice (not included in the scope of
supply)

 RE 92060/01.2017, Bosch Rexroth AG

 Dimensions [mm]
18 DR, DP, FR and DFR | Controllers
DPF − with flow controller

Dimensions DPF

▼▼ A4VSO, size 125 to 355

A11 to flanging face

A9 to flanging face
A7 to flanging face
XF
5
XD 3 2 8

1.1
A2

A11
A8

B
Valve mounting for
M2(M1) clockwise rotation
XD
MSt

XF
A12

A5
LR
A1

15 0 15

Einschraubloch M33
A6

R(L)

B
M1(M2) (Valve mounting for counter-
clockwise rotation)

NG A1 A2 A5 A6 A7 A8 A9 A10 A11 A12

125 354 261 41 71 191.5 172 345 220.5 371 39 For detailed dimensions and technical data of the
180 354 261 41 71 191.5 172 345 220.5 371 39 variable pump, see data sheet 92050 (A4VSO)

250 424 306 41 51 236.5 208 407 267.5 433 39

355 424 306 41 51 236.5 208 407 267.5 433 39

Port Standard Size 1)

pmax abs [bar]2) State 3)

XD Pilot pressure pressure controller DIN 3852 M14 x 1.5; 12 deep 400 O
XF Pilot pressure flow controller DIN 3852 M14 x 1.5; 12 deep 400 O
MSt Pilot pressure measurement DIN 3853 S8 shape W 400 X
M1; M2 Measurement of stroking DIN 3852 M14 x 1.5; 12 deep (NG 125 and 180) 400 X
­chamber pressure M18 x 1.5; 12 deep (NG 250 and 355) X

Components, see page 17

1) For notes on tightening torques, see the instruction manual 3) O = Must be connected (plugged on delivery)
2) Momentary pressure spikes may occur depending on the application. X = Plugged (in normal operation)
Keep this in mind when selecting measuring devices and fittings.

Bosch Rexroth AG, RE 92060/01.2017

Controllers | DR, DP, FR and DFR 19
 FR/FR1 − flow controller

FR/FR1 − flow controller

The flow controller adjusts the displacement of the pump A4VSO - open circuit
to the volume required by the consumer.
The flow of the pump is then dependent on the cross sec- ▼▼ Static characteristic

tion of the external measuring orifice (pos. 4), which is

located between the pump and the consumer. The flow is
max
nearly independent of the load pressure within the control 350
range of the pump (see maximum flow deviation below).
The opening cross section of the measuring orifice deter-

Operating pressure p →
mines the flow of the pump.
The flow controller compares the pressure before the
measuring orifice with that after the orifice and maintains
the pressure drop encountered here (differential pressure
∆p) and thus controls the flow.
If the differential pressure ∆p increases, the pump is swiv-
eled back (towards Vg min), if the differential pressure ∆p
decreases the pump is swiveled out (towards Vg max), until 14 min
0
equilibrium in the valve is restored. qv min Flow qv max
∆porifice = ppump – pconsumer
The standard setting on the flow control valve (pos. 2) for ▼▼ Flow direction S to B
∆p is 14 bar. If a different setting (recommended range
Direction of rotation Swiveling range1) High-pressure port
14 to 25 bar) is required, please state in plain text. Higher pump
values on request.
clockwise left B
The stand-by pressure in zero stroke operation (sensing
orifice plugged) is slightly above the ∆p setting. counter-clockwise right B
The DFR1 version has no connection from XF to the tank. 1)
cf. swivel angle indicator
right

15 0 15
left
▶▶ Initial position in depressurized state: Vg max
▶▶ Mechanical minimum and maximum swivel angle limita- ▼▼ Static characteristic at variable rotational speed
tion
–– The Vg min stop is set so that a pressure of 15 to
20 bar is set when port B is plugged.
–– The Vg max stop is set to nominal Vg max. When ordering,
please state other settings requests in plain text
­(possible setting ranges Vg max to 50 % Vg max).
Flow qv

Rotational speed n

▼▼ Max. flow deviation

measured at drive speed n = 1500 rpm
Size 40 71 125 180 250 355

∆pv [l/min] 3 3 5 6 8 10

 RE 92060/01.2017, Bosch Rexroth AG

20 DR, DP, FR and DFR | Controllers
FR/FR1 − flow controller

▼▼ Dynamic characteristic
Swivel times
The characteristics are measured median values. NG tSA [s] tSE [s] tSE [s]
Flow step standby / qv max through relief of the X port to standby...350 bar 350 bar...standby 50 bar...standby
the tank. 40 approx. 0.1 0.02 0.050
71 approx. 0.2 0.03 0.075
100 400
125 approx. 0.3 0.04 0.100
350
180 approx. 0.4 0.05 0.120

Load pressure
75 300
Displacement Vg [%]

250 approx. 0.4 0.06 0.150

[bar]
355 approx. 0.5 0.07 0.180
50 200
The values of the outward swivel time tSA (Vg min → Vg max)
can be shortened by the factor 2 to 3 if required (please
25 100 contact us).
50
Standby
This does not have any effect on the inward swivel time tSE .
0
Swivel time t

Outward swivel time tSA Inward swivel time tSE

FR/FR1 schematics
▼▼ A4VSO, sizes 40 and 71 ▼▼ A4VSO, sizes 125 to 355

for FR1 for FR1

plugged plugged
B B
XF XF

4 4 2

B1 B MB 2
B1 B MB 3

1.1
1.1

U S MS K1 K2 T R(L)
U S MS M1 K1 K2 T R(L) M2

Port
XF Pilot pressure flow controller
M1, M2 Measurement stroking chamber pressure (NG 125 to 355)

Components
1 Pump with hydraulic control device
1.1 A4VSO (see data sheet 92050)
2 Flow control valve
3 Intermediate plate (NG 125 to 355)
4 External measuring orifice (not included in the scope of
supply)

Bosch Rexroth AG, RE 92060/01.2017

Dimensions [mm]
Controllers | DR, DP, FR and DFR 21
 FR/FR1 − flow controller

Dimensions FR/FR1

▼▼ A4VSO, sizes 40 and 71 ▼▼ A4VSO, size 125 to 355

A7 to flanging face
A7 to flanging face
XF
3 XF
1.1
2 1.1 2
A2

A8

A2

A8
B
Valve mounting for B
clockwise rotation
Valve mounting for
clockwise rotation
M2(M1)
XF
A3

XF
M14x1.50

M14x1.50
A5

M14x1.50
M14x1.50
LR
15 0 15
A1

A5
Einschraubloch M33
LR
15 0 15
A1

Einschraubloch M33
A6

A6
R(L)
A4

R(L)
B
Schl.weite: 30 mm

B
M1(M2)
(Valve mounting
(XF for counter-
for counter-clock- (XF for counter-
clockwise rotation) (Valve mounting for coun-
wise rotation) clockwise rotation)
ter-clockwise rotation)

NG A1 A2 A3 A4 A5 A6 A7 A8
40 260 140 147 137 47 67 209 128 For detailed dimensions and technical data of the variable
71 298 157 142 142 42 72 236 144 pump, see data sheet 92050 (A4VSO)

125/180 354 191 – – 41 71 305 172

250/355 424 238 – – 41 71 367 208

Port Standard Size1) pmax abs [bar]2) State3)

XF Pilot pressure flow controller DIN 3852 M14 x 1.5; 12 deep 400 O
M1; M2 Measurement of stroking DIN 3852 M14 x 1.5; 12 deep (NG 125 and 180) 400 X
­chamber pressure M18 x 1.5; 12 deep (NG 250 and 355) X

1) For notes on tightening torques, see the instruction manual 3) O = Must be connected (plugged on delivery)
2) Momentary pressure spikes may occur depending on the application. X = Plugged (in normal operation)
Keep this in mind when selecting measuring devices and fittings.

 RE 92060/01.2017, Bosch Rexroth AG

22 DR, DP, FR and DFR | Controllers
FRG/FRG1 − flow controller with remote controlled pressure control

FRG/FRG1 − flow controller with remote controlled pressure control

The FRG pressure flow controller is a combination of FR A4VSO - open circuit

(FR1) and DRG.
The flow control is overridden by a pressure control that is ▼▼ Characteristic

controlled by a separate pressure-relief valve (pos. 4).

For the function and technical data of the remote con-
max
trolled pressure control, see page 7. 350
For the function and technical data of the FR flow control-

Operating pressure p [bar]

ler, see pages 19 and 20.
The FRG1 version has no connection from XF to the tank.

20 min
0
qv min Flow qv max

▼▼ Flow direction S to B

Direction of rotation Swiveling range1) High-pressure port

Pump

clockwise left B
counter-clockwise right B
1)
cf. swivel angle indicator
right

15 0 15
left

Bosch Rexroth AG, RE 92060/01.2017

Controllers | DR, DP, FR and DFR 23
 FRG/FRG1 − flow controller with remote controlled pressure control

▼▼ A4VSO, sizes 40 and 71 ▼▼ A4VSO, sizes 125 to 355

for FRG1
for FRG1 plugged
plugged
B
B XF
XF 2
2

XD 6
4 6 4 5
XD
5

B1 B MB B1 B MB 3

1.1 1.1

U S MS K1 K2 T R(L) U S MS M1 K1 K2 T R(L) M2

Port
XD Pilot pressure remote control pressure controller
XF Pilot pressure flow controller
M1, M2 Measurement stroking chamber pressure (NG 125 to 355)

Components
1 Pump with hydraulic control device
1.1 A4VSO (see data sheet 92050)
2 Flow control valve
3 Intermediate plate (NG 125 to 355)
4 External measuring orifice (not included in the scope of
supply)
5 Pressure control valve
6 External pressure control valve (not included in the ­scope
of supply)

 RE 92060/01.2017, Bosch Rexroth AG

 Dimensions [mm]
24 DR, DP, FR and DFR | Controllers
FRG/FRG1 − flow controller with remote controlled pressure control

Dimensions FRG/FRG1

▼▼ A4VSO, sizes 40 and 71 ▼▼ A4VSO, size 125 to 355

A10 to flanging face A10 to flanging face

A9 to flanging face A9 to flanging face
A7 to flanging face A7 to flanging face

5 3 5
XD XF XD XF

1.1 1.1
A2

2
A8

A2

A8
2

B
B
Valve mounting for
Valve mounting for
clockwise rotation
clockwise rotation
XD M2(M1)

XF XD
A3

XF
A5

A5
LR
15 0 15
A1

A1

LR
15 0 15

Einschraubloch M33

Einschraubloch M33
A6

A6
R(L)
A4

R(L)
Schl.weite: 30 mm Schl.weite: 30 mm

B
B
M1(M2) (XD and XF for
(Valve mounting for counter- (Valve mounting for counter- counter-clock-
(XD and XF for counter-
clockwise rotation) clockwise rotation) wise rotation)
clockwise rotation)

NG A1 A2 A3 A4 A5 A6 A7 A8 A9 A10
40 260 140 147 137 47 67 209 128 249 275 For detailed dimensions and technical data
71 298 157 142 142 42 72 236 144 276 302 of the variable pump, see data sheet 92050
(A4VSO)
125/180 354 191 – – 41 71 305 172 345 371
250/355 424 238 – – 41 71 367 208 407 433

Port Standard Size1) pmax abs [bar]2) State3)

XD Pilot pressure remote control pressure DIN 3852 M14 x 1.5; 12 deep 400 O
controller
XF Pilot pressure flow controller DIN 3852 M14 x 1.5; 12 deep 400 O
M1; M2 Measurement of stroking chamber DIN 3852 M14 x 1.5; 12 deep (NG 125 and 180) 400 X
pressure M18 x 1.5; 12 deep (NG 250 and 355) X

Components, see page 23

1) For notes on tightening torques, see the instruction manual 3) O = Must be connected (plugged on delivery)
2) Momentary pressure spikes may occur depending on the application. X = Plugged (in normal operation)
Keep this in mind when selecting measuring devices and fittings.

Bosch Rexroth AG, RE 92060/01.2017

Controllers | DR, DP, FR and DFR 25
 DFR/DFR1 − pressure-flow controller

DFR/DFR1 − pressure-flow controller

The DFR pressure and flow controller DFR is a combination A4VSO - open circuit
of the DR pressure controller and FR flow controller.
For the function and technical data, see DR (page 3) and ▼▼ Static characteristic

FR (page 19).
The DFR1 version has no connection from XF to the tank.
350

▶▶ Initial position in depressurized state: Vg max

Pressure deviation ≤ 3 bar

Operating pressure p [bar]
▶▶ Mechanical minimum and maximum swivel angle limita-
tion
–– The Vg min stop is set so that a pressure of 15 to
20 bar is set when port B is plugged.
–– The Vg max stop is set to nominal Vg max. When ordering,
please state other settings requests in plain text
­(possible setting ranges Vg max to 50 % Vg max).
50

qv min qv max
Flow

▼▼ Flow direction S to B

Direction of rotation Swiveling range1) High-pressure port

pump

clockwise left B
counter-clockwise right B
1)
cf. swivel angle indicator

15 0 15
right
left

 RE 92060/01.2017, Bosch Rexroth AG

26 DR, DP, FR and DFR | Controllers
DFR/DFR1 − pressure-flow controller

DFR/DFR1 schematics

▼▼ A4VSO, sizes 40 and 71 ▼▼ A4VSO, sizes 125 to 355

for DFR1 for DFR1

plugged plugged
B
B
XF
XF
2 2

4 4
5 5

B1 B MB 3
B1 B MB

1.1 1.1

U S MS K1 K2 T R(L) U S MS M1 K1 K2 T R(L) M2

Port
XF Pilot pressure flow controller
M1, M2 Measurement stroking chamber pressure (NG 125 to 355)

Components
1 Pump with hydraulic control device
1.1 A4VSO (see data sheet 92050)
2 Flow control valve
3 Intermediate plate (NG 125 to 355)
4 External measuring orifice (not included in the scope of
supply)
5 Pressure control valve

Bosch Rexroth AG, RE 92060/01.2017

Dimensions [mm]
Controllers | DR, DP, FR and DFR 27
 DFR/DFR1 − pressure-flow controller

Dimensions DFR/DFR1

▼▼ A4VSO, sizes 40 and 71 ▼▼ A4VSO, size 125 to 355

A9 to flanging face A9 to flanging face

A7 to flanging face A7 to flanging face
3 5
5 XF XF

1.1 1.1

A2
A2

A8

A8
2

B B
Valve mounting for M2(M1)
clockwise rotation
Valve mounting for
clockwise rotation
A3

XF XF
A5

A5
15 0 15
LR

LR
A1

A1

15 0 15

Einschraubloch M33

Einschraubloch M33

A6
A6

R(L)
A4

R(L)
Schl.weite: 30 mm Schl.weite: 30 mm

B
B
(Valve mounting for
(Valve mounting for counter-
clockwise rotation)
M1(M2) counter-clockwise
rotation)

NG A1 A2 A3 A4 A5 A6 A7 A8 A9
40 260 140 147 137 47 67 249 128 275 For detailed dimensions and technical data of the
71 298 157 142 142 42 72 276 144 302 variable pump, see data sheet 92050 (A4VSO)

125/180 354 191 – – 41 71 345 172 371

250/355 424 238 – – 41 71 407 208 433

Port Standard Size1) pmax abs [bar]2) State3)

XF Pilot pressure flow controller DIN 3852 M14 x 1.5; 12 deep 400 O
M1; M2 Measurement of stroking chamber DIN 3852 M14 x 1.5; 12 deep (NG 125 and 180) 400 X
pressure M18 x 1.5; 12 deep (NG 250 and 355) X

1) For notes on tightening torques, see the instruction manual 3) O = Must be connected (plugged on delivery)
2) Momentary pressure spikes may occur depending on the application. X = Plugged (in normal operation)
Keep this in mind when selecting measuring devices and fittings.

 RE 92060/01.2017, Bosch Rexroth AG

28 DR, DP, FR and DFR | Controllers
Project planning notes

Project planning notes

▶▶ The A4VSO axial piston variable pump is designed to be ▶▶ Pressure controllers are not protection against overpres-
used in open circuit. sure. A pressure relief valve is to be provided for the
▶▶ The project planning, installation and commissioning of hydraulic system.
the axial piston unit requires the involvement of quali- ▶▶ Working ports:
fied skilled personnel. –– The ports and fastening threads are designed for the
▶▶ Before using the axial piston unit, please read the corre- specified maximum pressure. The machine or system
sponding instruction manual completely and thoroughly. manufacturer must ensure that the connecting ele-
If necessary, these can be requested from Bosch ments and lines correspond to the specified applica-
Rexroth. tion conditions (pressure, flow, hydraulic fluid, tem-
▶▶ Before finalizing your design, please request a binding perature) with the necessary safety factors.
installation drawing. –– The working ports and function ports are only
▶▶ The specified data and notes contained herein must be intended to accommodate hydraulic lines.
observed.
▶▶ Depending on the operating conditions of the axial Safety instructions
piston unit (working pressure, fluid temperature), the
characteristic curve may shift. ▶▶ During and shortly after operation, there is a risk of
▶▶ Preservation: Our axial piston units are supplied as getting burnt on the axial piston unit and especially
standard with preservative protection for a maximum of on the solenoids. Take appropriate safety measures
12 months. If longer preservative protection is required (e.g. by wearing protective clothing).
(maximum 24 months), please specify this in plain text ▶▶ Moving parts in control equipment (e.g. valve pistons)
when placing your order. The preservation periods apply can, under certain circumstances get stuck in position
under optimal storage conditions, details of which can as a result of contamination (e.g. impure hydraulic fluid,
be found in the data sheet 90312 or the instruction abrasion, or residual dirt from components). As a result,
manual. the hydraulic fluid flow and the build-up of torque in the
▶▶ Not all versions of the product are approved for use in a axial piston unit can no longer respond correctly to the
safety function pursuant to ISO 13849. Please consult operator’s specifications. Even the use of various filter
the responsible contact person at Bosch Rexroth if you elements (external or internal flow filter) will not rule
require reliability parameters (e.g. MTTFd) for functional out a fault but merely reduce the risk. The machine/
safety. system manufacturer must test whether remedial mea-
▶▶ Depending on the type of control used, electromagnetic sures are needed on the machine for the application
effects can be produced when using solenoids. When a concerned in order to set the consumer being driven to
direct current is applied, solenoids do not cause electro- a safe position (e.g. safe stop) and if necessary to
magnetic interference nor is their operation impaired by ensure it is properly implemented.
electromagnetic interference.
Other behavior can result when a modulated direct
current (e.g. PWM signal) is applied. Potential electro-
magnetic interference for persons (e.g. persons with a
pacemaker) and other components must be tested by
the machine manufacturer.

Bosch Rexroth AG © Bosch Rexroth AG 2017. All rights reserved, also regarding any disposal,
Mobile Applications exploitation, reproduction, editing, distribution, as well as in the event of
An den Kelterwiesen 14 applications for industrial property rights. The data specified within only
72160 Horb a.N., Germany serves to describe the product. No statements concerning a certain condi-
Tel. +49 7451 92-0 tion or suitability for a certain application can be derived from our informa-
info.ma@boschrexroth.de tion. The information given does not release the user from the obligation of
www.boschrexroth.com/brm own judgment and verification. It must be remembered that our products are
subject to a natural process of wear and aging.

Bosch Rexroth AG, RE 92060/01.2017