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Hydraulic Piston Pumps vs. Hydraulic Gear Pumps 17## October 2016

Different hydraulic pumps are manufactured to meet the different requirements of different hydraulic systems. In practical terms, what that means is that the right pump for one system or purpose may not be the right one for another. The types of hydraulic pumps we offer are described below. If you need us to build a new pump to suit your system or maintain or repair your existing installation, we offer a range of piston pumps that we can build to order as well.

Gear Pumps

Hydraulic gear pumps are durable, low-cost, and capable of a wide range of displacement sizes and pressures. Typically, gear pumps are rated at approximately 3,000 psi (206 bar) maximum operating pressure, though they can reach a rating as high as 4,500 psi (310 bar).

In our hydraulic pump type comparison, it’s important to note gear pumps are only capable of fixed displacement. If a hydraulic system needs to handle different amounts of fluid passing through it at different times, it will require valves to control the flow or a variable displacement piston pump can be used.

Piston Pumps

Piston pumps typically have a higher pressure rating than gear pumps. At their most basic, piston pumps are capable of around 4,000 psi (275 bar). However, we also offer them with much higher ratings, including 14,500 psi piston pumps (those with up to 1,000 bar). The amount of fluid that piston pumps are able to displace varies widely depending on the model.

In addition to being capable of pumping at higher pressure, it is also possible to efficiently adjust the displacement per rev of some piston pumps, which allows a much more efficient use of energy than with a fixed displacement gear or piston pump.

Piston pumps are more complex than gear pumps and, therefore, more expensive; however, where high pressures and/or effective control of oil flow is required, it is normally from an energy efficiency point of view worth using a piston pump rather than a gear pump.

For more information on White House Products, Ltd. and the different types of hydraulic pumps we offer, contact us today at +44 (0)1475 742500.

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