A two speed pump is a hydraulic hand tool which contains an external pressure release valve, a factory set safety relief valve, and a has a setting for a changeover pressure. Typically it creates more flow at lower working pressures and lower flow at higher working pressures. This allows for optimal efficiency across increasing pressures in hydraulic cylinders.
When found in a manual hydraulic tool, the two speed pump is favored as it allows for a lower handle effort at higher pressures.
Here’s how it works:
Functions of a Two Speed Pump
The two speed pump’s relief valve is set to a pressure which is typically referred to as a changeover pressure. When the pressure increases in the cylinder or hydraulic system, and reaches the changeover pressure, the two speed pump switches from low to high pressure piston.
A two speed pump will switch back and forth from low to high pressure pistons when the cylinder hits the changeover pressure (200 PSI for example). This changeover will occur automatically internally.
Winshaw Hydraulic Tools’ HP manually operated hand pumps come in a variety of materials, including aluminum and steel. The HP227 and HP232 two speed pumps are some of our most in-demand hydraulic tools. The example below shows their operation.
Advantages of a Two Speed Pump
While a two speed pump is usually a higher cost than a single speed pump, a two speed pump offers many advantages. For instance, it is also easier to work at higher pressures, with less demand on the operator.
The Hi-Force HP manually operated two speed pumps come in a variety of models. Most models feature two way valves, but four way valves are also available. With their easy operation and lightweight design, the Hi-Force HP manually operated two speed pumps give you the best value for your hydraulic tool investment.
To learn more about our two speed pumps and other hydraulic tools, contact Winshaw Hydraulic Tools today.