Unloading Valve
Series R4U
4-77
R4U UK.INDD RH 06.09.2011
Catalogue HY11-3500/UK
Parker Hannifin Corporation
Hydraulics Group
4
Characteristics
Subplate mounted unloading valves series R4U are used
to unload a circuit at low pressure. The mechanically
adjustable pressure signal to unload the main stage has
to be applied to port X. The pressure differential between
opening and closing is nominal 15 or 28 % of the setting
pressure.
28 % for pressure stages bar 105, 210
15 % for pressure stages bar 350
Typical applications are unloading of pumps in an ac-
cumulator circuit or unloading of the low pressure stage
of a double pump.
The R4U is available with an electrical vent valve for
unpressurized circulation.
Features
• Pilot operated unloading valve
• Interface
- subplate mounting to ISO 5781
• 3 pressure stages
• 2 vent valve functions
• 3 adjustment modes
- hand knob
- acorn nut with lead seal
- Key lock
R4U06
R4U R4U with vent function
R4U06 with vent function
Unloading Valve
Series R4U
4-78
R4U UK.INDD RH 06.09.2011
Catalogue HY11-3500/UK
Parker Hannifin Corporation
Hydraulics Group
4
Code Pressure stages
1 up to 105 bar
3 up to 210 bar
5 up to 350 bar
Body
design
Pressure
valve
Pilot oil
Design
series
Seals
Interface Modifi-
cations
Max.pressure
(350 bar)
Adjust-
ment
Code Seals
1 NBR
5 FPM
Unloading
function
Nominal
size
Pressure
stages
Code Nominal size
03 NG10
06 NG25
10 NG32
Code Adjustment
1
Hand knob 32mm dia.
(Standard)
3 Acorn nut with lead seal
4 Key lock
Code Interface
4
Subplate
mounting
ISO 5781
Pilot oil
Code Drain line
0 Internal
1 External from subplate
R 4 U 5 3 A
Ordering Code
4-79
R4U UK.INDD RH 06.09.2011
Unloading Valve
Series R4U with Vent Function
Catalogue HY11-3500/UK
Parker Hannifin Corporation
Hydraulics Group
4
Ordering Code
Pilot oil
Vent valve
function
Pressure
valve
Interface Nominal
size
Pressure
stages
Adjust-
ment
Design
series
Solenoid
voltage
SealsRelief
function
Modifi-
cations
Pilot oil
Code Drain line
0 internal
1 external from subplate
Code Vent valve
09
Solenoid not activ.
unpress. circulation
11
Solenoid activated
unpress. circulation
Code Adjustment
1 Hand knob (Standard)
3 Acorn nut with lead seal
4 Key lock
Max. pressure
(350 bar)
Body
design
Code Voltage
G0R 12V =
G0Q 24V =
GAR 98V =
GAG 205V =
W30
110V / 50Hz
120V / 60Hz
W31
230V / 50Hz
240V / 60Hz
R 4 U 5 3 A
Code Seals
1 NBR
5 FPM
Code Interface
4
Subplate
mounting
ISO 5781
Code Nominal size
03 NG10
06 NG25
10 NG32
Code Pressure stages
1 up to 105 bar
3 up to 210 bar
5 up to 350 bar
Unloading Valve
Series R4U
4-80
R4U UK.INDD RH 06.09.2011
Catalogue HY11-3500/UK
Parker Hannifin Corporation
Hydraulics Group
4
General
Nominal size 10 25 32
Interface Subplate mounting acc. ISO 5781
Mounting position as desired, horizontal mounting prefered
Ambient temperature [°C] -20...+80
MTTF
D
value [years] 75
Weight [kg] 4.4 6.2 7.7
Hydraulic
Max. operating pressure [bar] Ports A and X 350, Ports B and Y depressurized
Pressure stages [bar] 105, 210, 350
Pressure differential 28 % (for pressure stages 105 bar and 210 bar); 15% (for pressure stages 350 bar)
Nominal flow [l/min] 150 350 650
Fluid Hydraulic oil according to DIN 51524 ... 51525
Viscosity,
recommended [cSt] /
permitted [cSt] /
[mm²/s]
[mm²/s]
30 ... 50
20...380
Fluid temperature [°C] -20 ... +70
Filtration ISO 4406 (1999) 18/16/13 (acc. NAS 1638:7)
Electrical (solenoid)
Duty ratio [%] 100 ED; CAUTION: coil temperature up to 180 °C possible
Max. switching frequency 160000 (DC), 7200 (AC)
Protection class IP65 in according with EN 60529 (with correctly mounted plug-in connector)
Code
Supply voltage [V]
Tolerance supply voltage [%]
Power consumption hold [W]
in rush [W]
Solenoid connection Connector as per EN 175301-803
Wiring min. [mm
2
] 3 x 1.5 recommended
Wiring length max. [m] 50 recommended
Technical Data
General
Nominal size 10 25 32
Interface Subplate mounting acc. ISO 5781
Mounting position as desired, horizontal mounting prefered
Ambient temperature [°C] -20...+80
MTTF
D
value [years] 75
Weight [kg] 2.7 4.5 6.0
Hydraulic
Max. operating pressure [bar] Ports A and X 350, Ports B and Y depressurized
Pressure stages [bar] 105, 210, 350
Pressure differential 28 % (for pressure stages 105 bar and 210 bar); 15% (for pressure stages 350 bar)
Nominal flow [l/min] 150 350 650
Fluid Hydraulic oil according to DIN 51524 ... 51525
Viscosity,
recommended [cSt] /
permitted [cSt] /
[mm²/s]
[mm²/s]
30 ... 50
20...380
[mm²/s] 20 ... 380
Fluid temperature [°C] -20 ... +70
Filtration ISO 4406 (1999) 18/16/13 (acc. NAS 1638:7)
R4U
R4U with vent function
G0R G0Q GAR GAG W30 W31
12V = 24V = 98V = 205V =
110V/50Hz
120V/60Hz
230V/50Hz
240V/60Hz
+5...-10 +5...-10 +5...-10 +5...-10 +5...-10 +5...-10
31 31 31 31 78 78
31 31 31 31 264 264
Unloading Valve
Series R4U
4-81
R4U UK.INDD RH 06.09.2011
Catalogue HY11-3500/UK
Parker Hannifin Corporation
Hydraulics Group
4
Characteristic Curves
p/Q performance curve
1)
Minimum pressure curve
1)
The performance curves are measured with external drain.
For internal drain the tank pressure has to be added to curve.
All characteristic curves measured with HLP46 bei 50°C.
Unloading Valve
Series R4U
4-82
R4U UK.INDD RH 06.09.2011
Catalogue HY11-3500/UK
Parker Hannifin Corporation
Hydraulics Group
4
X4
X1
X5
X2
X7
Y3
Y1
Y2
X6
Ød1
X3
Y4
Ød2
d4xt4
Ød2
Ød3xt3
A
B
X
Y
L5
30
B1
B2
L2
L1
L4
H2
Ød6
Ød5
H5
H1
L6
Hand knob
Acorn nut with
lead seal
Key lock
R4U
NG ISO-code x1 x2 x3 x4 x5 x6 x7 y1 y2 y3 y4 y5 y6
10 5781-06-07-0-00 42.9 35.8 21.5 – 7.2 21.5 31.8 66.7 58.8 33.4 7.9 – –
25 5781-08-10-0-00 60.3 49.2 39.7 – 11.1 20.6 44.5 79.4 73 39.7 6.4 – –
32 5781-10-13-0-00 84.2 67.5 59.5 42.1 16.7 24.6 62.7 96.8 92.8 48.4 3.8 – –
Tolerance at X and Y pin holes and screw holes ±0.1, at port holes ±0.2.
NG ISO-code B1 B2 H1 H2 H3 H4 H5 H6 L1 L2 L3 L4 L5 L6
10 5781-06-07-0-00 87.3 33.35 83 21 62.5 – – – 29 94.8 – 143 181 144.8
25 5781-08-10-0-00 105 39.7 109.5 29 89 – – – 34.7 126.8 – 143 181 144.8
32 5781-10-13-0-00 120 48.4 120 29 99.5 – – – 30.6 144.3 – 143 181 144.8
NG ISO-code d1max d2max d3 t3 d4 t4 d5 d6 Subplate
1)
10 5781-06-07-0-00 15 7 7.1 8 M10 16 10.8 17 SPP 3M6B 910
25 5781-08-10-0-00 23.4 7.1 7.1 8 M10 18 10.8 17 SPP 6M8B 910
32 5781-10-13-0-00 32 7.1 7.1 8 M10 20 10.8 17 SPP 10M12B 910
1)
Details see chapter 12, series SPP
Dimensions
NG ISO-code Bolt kit Surface finish
NBR FPM
10 5781-06-07-0-00 BK 505 4x M10 x 35 DIN 912 12.9 63 Nm ±15% S26-58507-0 S26-58507-5
25 5781-08-10-0-00 BK 485 4x M10 x 45 DIN 912 12.9 63 Nm ±15% S26-58475-0 S26-58475-5
32 5781-10-13-0-00 BK 506 6x M10 x 45 DIN 912 12.9 63 Nm ±15% S26-58508-0 S26-58508-5
4-83
R4U UK.INDD RH 06.09.2011
Catalogue HY11-3500/UK
Parker Hannifin Corporation
Hydraulics Group
4
Ød6
Ød5
H2
L1
Y2
H3
H4
H1
L4
L6
B3
15
B2
B1
Ød2
X6
X7
X
A B
Ød3xt3
Ød1
Y1
L5
L2
30
Y
X2
X4
X5
X3
Ød2
X1
Y3
Y4
d4xt4
Key lock
Hand knob
R4U
with vent function
NG ISO-code x1 x2 x3 x4 x5 x6 x7 y1 y2 y3 y4 y5 y6
10 5781-06-07-0-00 42.9 35.8 21.5 – 7.2 21.5 31.8 66.7 58.8 33.4 7.9 – –
25 5781-08-10-0-00 60.3 49.2 39.7 – 11.1 20.6 44.5 79.4 73 39.7 6.4 – –
32 5781-10-13-0-00 84.2 67.5 59.5 42.1 16.7 24.6 62.7 96.8 92.8 48.4 3.8 – –
Tolerance at X and Y pin holes and screw holes ±0.1, at port holes ±0.2.
NG ISO-code B1 B2 B3 H1 H2 H3 H4 H5 H6 L1 L2 L3 L4 L5 L6
10 5781-06-07-0-00 87.3 33.35 70 130 21 68.5 109.5 – – 29 94.8 – 143 181 165.6
25 5781-08-10-0-00 105 39.7 70 156.5 29 95 136 – – 34.7 126.8 – 143 181 165.6
32 5781-10-13-0-00 120 48.4 70 167 29 105.5 146.5 – – 30.6 144.3 – 143 181 165.6
NG ISO-code d1max d2max d3 t3 d4 t4 d5 d6 Subplate
1)
10 5781-06-07-0-00 15 7 7.1 8 M10 16 10.8 17 SPP 3M6B 910
25 5781-08-10-0-00 23.4 7.1 7.1 8 M10 18 10.8 17 SPP 6M8B 910
32 5781-10-13-0-00 32 7.1 7.1 8 M10 20 10.8 17 SPP 10M12B 910
1)
Details see chapter 12, series SPP
Dimensions
NG ISO-code Bolt kit Surface finish
NBR FPM
10 5781-06-07-0-00 BK 505 4x M10 x 35 DIN 912 12.9 63 Nm ±15% S26-58507-0* S26-58507-5*
25 5781-08-10-0-00 BK 485 4x M10 x 45 DIN 912 12.9 63 Nm ±15% S26-58475-0* S26-58475-5*
32 5781-10-13-0-00 BK 506 6x M10 x 45 DIN 912 12.9 63 Nm ±15% S26-58508-0* S26-58508-5*
VV01 S56-40609-0 S56-40609-5
Unloading Valve
Series R4U with Vent Function
* Please combine seal kit of one size with seal kit of VV01 DC / AC solenoid for complete seal kit
4-84
R4U UK.INDD RH 06.09.2011
Catalogue HY11-3500/UK
Parker Hannifin Corporation
Hydraulics Group
4
Notes
