An anti-wear additive found in many types of hydraulic and lubricating fluids. Zinc dialkyldithiophosphate.
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AERATION
The state of air being suspended in a liquid such as a lubricant or hydraulic fluid.
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ATF
Fluid for automatic, hydraulic transmissions in motor vehicles.
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AUTOMATIC TRANSMISSION FLUID
ATF. Fluid for automatic, hydraulic transmissions in motor vehicles.
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FERROGRAPHY
An analytical method of assessing machine health by quantifying and examining ferrous wear particles suspended in the lubricant or hydraulic fluid.
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PUMP
A device which converts mechanical force and motion into hydraulic fluid power.
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FIRE-RESISTANT FLUID
Lubricant used especially in high-temperature or hazardous hydraulic applications. Three common types of fire-resistant fluids are: (1) water-petroleum oil emulsions, in which the water prevents burning of the petroleum constituent; (2) water-glycol fluids; and (3) non- aqueous fluids of low volatility, such as phosphate esters, silicones, and halogenated hydrocarbon-type fluids.
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HYDROLYSIS
Breakdown process that occurs in anhydrous hydraulic fluids as a result of heat, water, and metal catalysts: iron, steel, copper, etc.
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MICROMETER (μm)
A unit of length. One millionth of a meter. Also known as micron. 1 Micrometer = 39 millionths of an inch (.000039 inch). Contaminant size is usually described in microns. Relatively speaking, a grain of salt is about 60 microns and the eye can see particles to about 40 microns. Many hydraulic filters are required to be efficient in capturing a substantial percentage of contaminant particles as small as 5 microns.
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HYDRAULIC ACCUMULATOR
A pressurized vessel used to store hydraulic energy for the case when hydraulic pumps pressure unavailable i.e. various emergency conditions.
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SHOCK SUPPRESSOR
A device used to control hydraulic shock in the fluid.
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