Hy-Pro 1.5 Lmp Reversible Pump 

with Relief Valves

1.5 Litre per Minute, 100W , available in 12 / 24 vDC

Manufactured in our factory in the UK and designed for the marine autopilot market, these quiet gear pumps are the drives of choice for major autopilot manufacturers around the world. The range from 0.6 to 2.5 litres per minute is water resistant to IP67 and fully certified to the Recreational Craft Directive (including ignition protection) and the navigational EMC standard. With low power consumption and high performance these pumps are ideal for all types of marine craft and other applications from snow-blowers to dentists chairs.

Backed with over 30 years of continuous development the PR+ range of reversing pumps presents the ultimate in quiet and smooth operation. Unlike noisy piston pump designs the precision gear form delivers smooth flow in all conditions and with minimal noise. Now with IP67 motors that have a 4000 hour brush life these latest generation of Hydraulic Projects power units are the best available. With low power consumption and high performance these pumps are ideal for all types of marine craft and other applications from snow-blowers to dentists chairs.

The PR+ range of pumps is also available with relief valves which provide independent control of the maximum pressure available at each service port. Relief valves can be fitted to either 1 or both services. They are used in many applications worldwide including sports car suspension lifters, door and hatch openers and snow blowers. 

They are available with the same 0.6, 1.0, 1.5, 2.0 and 2.5 litre per minute flows as the standard PR+ range. Pilot check valves are also fitted as standard and, they can be used with both balanced and unbalanced cylinders. They have an advanced protective coating designed especially for the salt laden atmosphere of the marine environment.

Thread adaptor kits are available here 

Autopilot Selection Guide:

It is important to select the correct size of pump as it directly influences the ability of the Autopilot to steer the vessel. If the pump is too large, the vessel may over steer and will use more power; if it is is too small then the Autopilot may struggle to maintain a course.

“Hard Over Time” is the time that the pump takes to drive the rudder from port to starboard. An Autopilot Drive will need to give a nominal “Hard over time” of 10 to 12 seconds unless otherwise specified by the Autopilot manufacturer. The type of vessel to be steered must be considered as the “Hard over time” may be faster on lightweight planing craft / modern yachts and slower on displacement power boats/ long keel yachts.

To use the table in our product pictures, you will need to know the volume of your steering cylinder, then simply select the "Hard over time" that you require. Follow the column down until you approximately match your cylinder volume and then select the pump on that row. If your cylinder has a smaller volume then it will have a faster “Hard Over Time”, but if it is larger, it will have a slower “ Hard Over Time”.