Parker Hannifin Corporation
Hydraulics Group
Catalogue HY11-3500/UK
9
9-9
Pilot Operated Pressure Unloading Valve
Series R5U
R5U UK.INDD CM 02.08.11
Characteristics
R5U 3-port internal drain R5U 3-port external drain
High pressure / low pressure system
Pilot operated pressure unloading valves series R5U have
a similar design to the subplate mounted R4U series. The
SAE flanges allow to mount the valve directly on the outlet
flanges of pumps.
A typical application is the unloading of a pump in an ac-
cumulator circuit. The combination of an R5U, C5V and
R5V on a double pump generates a high pressure / low
pressure pump system without the need of a manifold
block or piping between the valves.
Features
• Pilot operated unloading valve
• 3-port body with SAE61 flange
• 4 sizes (SAE ¾", 1", 1¼", 1½")
• 3 pressure stages
• 3 adjustment modes
- Hand knob
- Acorn nut with lead seal
- Key lock
• With optional vent function
Parker Hannifin Corporation
Hydraulics Group
Catalogue HY11-3500/UK
9
9-10
R5U UK.INDD CM 02.08.11
Pilot Operated Pressure Unloading Valve
Series R5U
Code Port size
06 SAE ¾"
08 SAE 1"
10 SAE 1¼"
12 SAE 1½"
AR5U 9
SAE61
interface
Pressure
stages
Pressure
unloading
valve
Design
series
Seals OptionsPilot oilNominal
size
3-port
body
M, Y1, X = G¼"
Adjust-
ment
Switching
type
Solenoid
voltage
Ordering Code
Code Adjustment
1 Hand knob
3 Acorn nut with lead seal
4 Key lock
Code Seals
1 NBR
5 FPM
Pilot oil
Code Pilot
Drain
4
External via
port X1 or X2
External
5
External via
port X1 or X2
Internal
Code Switching type
omit Standard w/o vent function
09
Solenoid not activ.
unpress. circulation
11
Solenoid activated
unpress. circulation
Further options on request
SAE 61
Code Size Max. pressure [bar]
3
12 210
4 10 280
5 06/08 350
Code Solenoid voltage
omit
Standard w/o
vent function
G0R 12V=
G0Q 24V=
GAR
2)
98V=
GAG
2)
205V=
W30
110V / 50Hz
120V / 60Hz
W31
230V / 50Hz
240V / 60Hz
Code
Pressure
stages [bar]
Pressure
differential
1 up to 105 28%
3 up to 210 28%
5
1)
up to 350 15%
1)
R5U10-4*5 up to 280 bar
2)
To be used in combination with
rectifier plugs at 120VAC/230VAC
power supply.
Parker Hannifin Corporation
Hydraulics Group
Catalogue HY11-3500/UK
9
9-11
Pilot Operated Pressure Unloading Valve
Series R5U
R5U UK.INDD CM 02.08.11
G0R G0Q GAR GAG W30 W31
12V = 24V = 98V = 205V =
110 at 50Hz
120 at 60Hz
230 at 50Hz
240 at 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
General
Size 06 (¾") 08 (1") 10 (1¼") 12 (1½")
Mounting Flanged according to SAE 61
Mounting position unrestricted
Ambient temperature [°C] -20...+50
MTTF
D
value [years] 75
Weight [kg] 3.6 4.6 5.2 8.0
Hydraulic
Max. operating pressure [bar]
Ports A, B, X 350 350 280 210
Ports Y, Y1 30 30 30 30
Pressure stages [bar] 105, 210, 350
Nominal flow [l/min] 90 300 600 600
Fluid Hydraulic oil according to DIN 51524...51525
Fluid temperature [°C] -20...+80
Viscosity permitted [cSt] / [mm
2
/s] 10...650
recommended [cSt] / [mm
2
/s] 30
Filtration ISO 4406 (1999); 18/16/13 (meet NAS 1638: 7)
Electrical
Duty ratio [%] 100
Solenoid connection Connector as per EN175301-803
Protection class IP65 in accordance with EN 60529 (with correctly mounted plug-in connector)
Code
Supply voltage [V]
Tolerance supply voltage [%]
Power consumption hold [W]
in rush [W]
Response time [ms] Energized / De-energized AC: 20/18 , DC: 46/27
Max. switching frequency AC: up to 7200, DC: up to 16000 switchings/hour
Coil insulation class H (180 °C)
Technical Data / Performance Curves
p/Q performance curve Minimum pressure curve
The performance curves are measured with external drain.
For internal drain the tank pressure has to be added to curve.
Technical data
All characteristic curves measured with HLP46 at 50°C.
Parker Hannifin Corporation
Hydraulics Group
Catalogue HY11-3500/UK
9
9-12
R5U UK.INDD CM 02.08.11
Pilot Operated Pressure Unloading Valve
Series R5U
Dimensions R5U
NG B1 B2 H1 H2 H3 H4 H5 H6 L1 L2 L3 L4 L5 d1 d2 d3 d4 t1 d5 L6 H7 H8
06 60 22.2 119 29.5 22.2 81 41.6 47.6 50.3 47.6 63 56 152 19 10.5 19 3/8”-16 UNC 20 3.0 – – –
08 60 26.2 141 30.5 26.2 103 47 52.4 55.8 52.4 65 58 149 25 10.5 25 3/8”-16 UNC 23 3.0 – – –
10 75 30.2 151 37.5 30.2 113 64 58.7 57.8 58.7 61 62 150.5 32 12.5 32 7/16”-14 UNC 22 3.0 – – –
12 80 35.7 178 35.5 35.7 140 73 69.8 37.3 69.8 92.5 55.2 171.2 38 13.5 38 1/2”-13 UNC 27 3.0 22.4 27.2 73
Dimensions
Port Function
Port size
R5U06 R5U08 R5U10 R5U12
A (2) Pressure ¾" SAE61 1" SAE61 1¼" SAE61 1½" SAE61
B Tank ¾" SAE61 1" SAE61 1¼" SAE61 1½" SAE61
X1 External pilot port
1)
G¼"
Y1 External drain G¼"
M Pressure gauge G¼"
1)
closed when supplied
Seal kits
NG NBR FPM
06 S16-91850-0 S16-91850-5
08 S16-91851-0 S16-91851-5
10 S16-91852-0 S16-91852-5
12 S26-27421-0 S26-27421-5
Parker Hannifin Corporation
Hydraulics Group
Catalogue HY11-3500/UK
9
9-13
Pilot Operated Pressure Unloading Valve
Series R5U
R5U UK.INDD CM 02.08.11
Dimensions R5U with vent function
Dimensions
Code Internal drain External drain
11
A
B Y
A
X1
or
X2
Z
X Y
A
B Y1
A
X1
or
X2
Z
X Y
09
A
B Y
A
X1
or
X2
Z
X Y
A
B Y1
A
X1
or
X2
Z
X Y
Seal kits
NBR FPM
DC solenoid
S26-58515-0 S26-58515-5
AC solenoid
S26-35237-0 S26-35237-5
Parker Hannifin Corporation
Hydraulics Group
Catalogue HY11-3500/UK
99
9-14
R5U UK.INDD CM 02.08.11
Catalogue HY11-3500/UK
Notes
