Pumps

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The hydraulic positive displacement pump is the heart of the hydraulic system. While it's true that pumps don’t create pressure, they do create flow.
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Selection criteria for gear pumps, vane pumps, axial piston pumps, radial piston pumps and axial checkball pumps.
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Pressure compensation is the control of flow by compensating for the changes in load pressure. Most hydraulic systems today use pre-compensation as a means of maintaining consistent flow from an orifice or spool. However, there are applications when post-compensation has advantages over pre-compensation.