PR+ RU Reversing DC Hydraulic Power Unit with reservoir and clutch

PR+ RU Reversing DC Hydraulic Power Unit with reservoir and clutch

Reversing type gear pumps driven by 12 or 24 volt DC permanent magnet motors. Incorporated in the design are pilot operated check valves that prevent the pump being back driven by the manual steering system or rudder load. The motors have an IP67 rating and can be removed from the pump without allowing air into the hydraulic system or fluid to escape. They can be used with both balanced and unbalancedcylinders. The pumps incorporate a fluid reservoir plus an unloading solenoid to allow the steering cylinder to ‘float’ when not in autopilot mode. 

When used in conjunction with a cylinder of your choice it forms a linear actuator to enable secondary steering via an autopilot.


Voltage:                          12 / 24 VDC 

                                       Typical amp-hour  Typical current

Current:                         5 bar at 25% duty  Intermittent 55 bar max

                                         12v      24v             12v    24v 

PR+RU 06                        0.9A        -                  9.0A      -

PR+RU 08                        1.3A        -                14.0A       -

PR+RU 10                        2.2A     1.0A            19.0A       9.0A

PR+RU 15                        2.4A     1.2A            24.0A     11.0A

PR+RU 20                        2.5A     1.3A            25.0A     12.0A

PR+RU 25                        2.7A     1.4A            34.0A     15.5A

Ingress Protection:  IP67

EMC Protection:  BS EN 60945:2002 (DC)

Ignition protection:  BS EN 28846:1993

Ambient operating temperature:  -15 to +55 deg C 

Max Pressure:  55 bar (intermittent operation)

Reservoir Capacity : 107cc at midships

Max heel Angle:  60°

Ports  A = Cylinder port G1/4 (BSP) Parallel

           B = Cylinder port G1/4 (BSP) Parallel

           Filler / Breather G1/2 (BSP) Parallel 

Rotation  Red lead to positive -   Pressure to A port 

Hoses  Suitable for working pressure 55 bar.

Minimum burst pressure 100 bar.

Fluid  ISO VG10 to VG40 Hydraulic mineral fluid

meeting ISO 6743-4 HV

The following commercial fluids are suitable.

 Fuchs Renolin B15 HV1

 Seastar HA5430

HB0003_07_Marine_Catalogue (HB0003_07_Marine_Catalogue_Nov_2017.pdf, 7,111 Kb) [Download]

PR+RU MANUAL (R4508-m23_-_PR_RU_MANUAL.pdf, 911 Kb) [Download]

Declaration_of_conformity_2019 (Declaration_of_conformity_2019.pdf, 440 Kb) [Download]

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