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Hydraulic Gear Pumps

Gear pumps are used in a wide range of hydraulic systems; in fact, they are easily among the most common types of pumps seen in this type of equipment. Hydraulic gear pumps are of a fixed displacement design and operate by pumping fluid through a system by means of a prime mover such as an engine or motor.
[Read more] Gear pumps are used in a wide range of hydraulic systems; in fact, they are easily among the most common types of pumps seen in this type of equipment. Hydraulic gear pumps are of a fixed displacement design and operate by pumping fluid through a system by means of a prime mover such as an engine or motor.

Although there are several uses for gear pumps and significant variations in gear pump components, their basic design and theory of operation is as follows. Every gear pump includes two (sometimes more) rotating gears whose teeth interlock. The rotation of the drive shaft turns the drive gear, which, due to the intermeshing design, also puts the other gear into motion. Hydraulic gear pumps do not create a strong suction so operate best with a flooded inlet.

Hydraulic gear pumps come in a number of different types:

Internal gear pumps – This types of pump utilises a “gear inside a gear” design. As the gears rotate in the same direction, the space between them varies in a controlled manner, resulting in displacement of the fluid. Internal gear pumps are noted for their relatively quiet operation and ability to manage thick fluid.

External gear pumps – These pumps have two intermeshed gears arranged side by side, one of which is connected to the drive shaft. Rotating the drive shaft creates motion in the gears and creates a flow path on the outside of each gear. An external gear pump can operate effectively at a variety of speeds and with a range of fluid viscosities. The main advantage is simplicity, size to power ratio, price to power ratio.

What can a hydraulic gear pump do that other pumps cannot? For the most part, hydraulic gear pumps offer precise output control that isn’t possible with centrifugal pumps, for example. Increasing or decreasing the speed of the prime mover will increase or decrease the output flow rate. Hydraulic gear pumps are normally made to only run in one rotation however this can normally be changed if required.

Hydraulic internal gear pumps are often more expensive than centrifugal pumps, whilst Hydraulic external gear pumps tend to be less expensive.. They tend to be noisier as well—which can be a problem in environments where extraneous noises cannot be tolerated—and cannot be used to handle abrasive materials.

White House Products Ltd carries high-quality equipment from today’s leading gear pump manufacturers. We invite you to explore the gear pumps that we have listed in this section.
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