Image Credit: Haskel International, Inc. | Grainger Industrial Supply | Continental Hydraulics
Hydraulic pumps are positive displacement pumps which pressurize hydraulic fluid in order to do work. They are powered by mechanical energy sources which apply force directly to a movable volume of liquid. Hydraulic pumps are simple pumps, but are able to achieve some of the highest pressures among pump types.
Hydraulic pumps generally operate on the principle of positive displacement. Positive displacement pumps use expanding and contracting cavities to move fluids. In the case of hydraulic pumps, these cavities apply force directly to a hydraulic fluid, allowing it to exit the pump at high pressures. There are many variations of positive displacement pumps, all of which are described in GlobalSpec's Pump Types page.
This video depicts the operation of a hydraulic piston pump developed by Graco Dispensing Machinery.
Video Credit: Era Polymers
There are a number of specifications to consider when selecting hydraulic pumps. The most important include pressure, flow rate, horsepower, efficiency, and operating temperature. The Pump Flow page on GlobalSpec provides more information on selecting a pump based on these specifications.
Hydraulic pumps are designed to generate high enough fluid pressures to do work. Applications for hydraulic pumps include construction equipment (e.g. backhoes, forklifts), manufacturing and machining equipment, elevators, and industrial presses.Read user Insights about Hydraulic Pumps
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DC Powered Pumps
DC powered pumps use direct current from motor, battery, or solar power to move liquids such as acids, chemicals, lubricants and oil, as well as water, wastewater, and potable water.
Dosing pumps are low-volume fluid pumps with controllable discharge rates used to inject additives into the mixing or pumping system.
Magnetic Drive Pumps
Magnetic drive pumps are sealless pumps that use a coaxial magnetic coupling to transmit torque to an impeller. A standard electric motor drives a set of permanent magnets that are mounted on a carrier or drive assembly.
Plastic pumps are designed to move fluids that would corrode or damage other types of pumps. They provide broad chemical resistance and are less costly and lighter in weight than metal pumps.
Positive Displacement Pumps
Positive displacement pumps use a mechanical force such as gears, bladders, pistons, plungers or diaphragms to push liquid through and out of the pump.
Sanitary pumps are used to transport and meter solutions, slurries, and colloids of food and agricultural materials in operations such as food processing that require cleanliness. There are four basic types of sanitary pumps: centrifugal, positive displacement, jet, and airlift.
Infusion or withdrawal syringe pumps provide high pressure and high accuracy for applications such as high performance liquid chromatography (HPLC). Used to deliver precise amounts of fluid at specific time intervals.