Hydraulic Pump Displacement Calculator

Hydraulic Pump Displacement refers to the amount of liquid transferred from a pump's inlet to its outlet in one cycle or revolution.

Log Splitter Calculators

A hydraulic pump converts mechanical power into hydraulic energy. It generates hydraulic fluid flow with enough pressure to overcome load resistance. The hydraulic pump performs two functions.

The pumps mechanical action creates a vacuum at the pump inlet which allows atmospheric pressure to force liquid from the reservoir into the pump.
The pumps mechanical action forces hydraulic fluid through the outlet forcing it into the hydraulic system.

A hydraulic pump produces liquid movement or the flow necessary to develop pressure, a function of resistance to fluid flow in the system.

Hydraulic Pump Classification

positive-displacement
non-positive-displacement

Most pumps used in hydraulic systems are positive-displacement. In a positive-displacement pump, slippage is negligible compared to the pump's volumetric output flow. Its output received the pressure, if the resistance is to great, the pumps hoses or casing will fail. A positive-displacement pump displaces (delivers) the same amount of fluid for each rotating cycle of the pumping element.

A non-positive-displacement pump produces a continuous flow, but does not provide an internal seal against slippage so its output can vary considerably as pressure varies. Centrifugal and propeller pumps are non-positive-displacement pumps.

Other names for positive and non-positive flow pumps are:

hydrostatic for positive-displacement
hydrodynamic for non-positive-displacement

Rotary pumps

Rotary pumps are generally classified according to the type of element that transfers liquid, a gear, lobe, vane, or piston. Rotary motion carries the liquid from the pump inlet to the pump outlet.

Log Splitter Hydraulic Circuit Diagram