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    Hydraulics Glossary – E

    A wall of varying thickness.

    The ratio of output to input. Volumetric efficiency of a pump is the actual output, in gallons per minute, divided by the theoretical or design output. The overall efficiency of a hydraulic system is the output power divided by the input power. Efficiency is usually expressed as a percentage.

    The escape, usually of gases, through a medium.

    Polymeric materials, including natural rubber or thermoplastic, that will soften when heated.

    An electro-mechanical device that converts electrical power into rotary motion. The resultant power output is measured in horsepower.

    A servo-valve which is capable of continuously controlling hydraulic output as a function of an electrical input.

    See FILTER ELEMENT.

    The increase in length expressed as a percentage of the original length.

    An additive that promotes the formation of a stable mixture, or emulsion, of oil and water.

    Intimate mixture of oil and water, generally of a milky or cloudy appearance.

    Lubricant additive that prevents sliding metal surfaces from seizing under conditions of extreme pressure (EP).

    Degradation of a surface resulting from a mixture of fluid and air or fluid and dirt particles passing over the surface at the same time as a change in pressure occurs.

    A passage or channel that is open to the atmosphere. Normally used in systems using pressurized air or gases which may then be dispensed into the atmosphere.

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    This is a system generated translation and as such will not be fully accurate. We are not responsible for incorrect or inaccurate translations and will not be held responsible for any damage or issues that may result from using this service.