In hydraulic systems, the liquid used must be mostly incompressible, or very dense. For a variety of applications, utilizing a liquid to move machinery is more desirable than drier methods. Using a liquid will not cause the same type of wear on the system, and also will not require as many moving parts. Additionally, motion is more precise and the equipment will run much smoother than it would with more mechanic means.

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Hydraulic control valves are used to control pressure in a hydraulic fluid power system. These valves control the pressure, flow rate and direction of the flow. Hydraulic valves can be defined in many different ways. Oftentimes, a given valve will be named differently when it is used in different applications. Hydraulic valves permit liquid to enter or leave specific spaces throughout the hydraulic system. Commonly, hydraulic valves are used with hydraulic pumps and cylinders to control the flow of the liquid.

Fluid power systems are adaptable in a variety of applications depending the on the working environment and task. For example, in industrial applications, a major concern is the noise level. Typically, a noise level below 70dB is desirable. Industrial fluid power systems commonly operate in the low (below 7 MPa or 1000 psi) to moderate (below 21 MPa or 3000 psi) pressure range and operate at a low noise level.