| ABSOLUTE RATING - The size of
microns of the largest spherical particle that will pass through the element. AREA - The surface exposed to the flow of a fluid.
BAR - A unit of pressure
One (1)bar = 14.5 PSI.
BETA RATIO - The ratio of the number of
particles greater than a specified micrometer in the influent fluid to the number of
particles larger than the specified micrometer in the effluent fluid.
BUBBLE POINT - The
differential gas pressure which when applied to a filter element submerged near the
surface of a test fluid causes the first steady emission of gas bubbles from the filter
element.
BUNA N - a
Nitrile rubber seal compound. This is a generic term covering many formulations.
CENTIPOISE - A unit of
absolute viscosity. One centipoise equals .01 poise.
CENTISTOKE - A unit of kinematic viscosity. One centistoke equals .01 stoke.
EFFICIENCY - The ability of a filter
element to remove/retain a specific artifical contaminant in a specified concentration
under controlled test conditions. Efficiency is expressed in percent.
FILTER ELEMENT - A porous device which
performs the actual filtration process.
FILTER MEDIA - The porous structure upon
which, or in which, fluid system contaminants are trapped.
FLOW FATIGUE RESISTANCE - The ability of a
filter medium to resist structural failure or deterioration from cyclic loading.
GPH - Gallons per hour.
GPM - Gallons per minute.
INLINE TYPE FILTER - A filter assembly
whose inlet, outlet, and filter element have a common centerline.
MEDIUM - The porous material that performs
the actual process of filtration.
MICROMETER OR MICRON - A unit of length. A
micrometer is one millionth of a meter or 0.000039" (39 millionths of an inch).
Expressed in convenient terms 25 micrometers are approximately equal to one thousandth of
an inch (.001").
MULTI-PASS TEST - A test used to determine
the Beta Ratio of a filter element. |
COLLAPSE
PRESSURE - The minimum differential pressure that a filter element
is designed to withstand without permanent deformation.
CYCLE - Filtration interval; length of
time filter operates before cleaning.
DELTA (D) P - Pressure drop.
DEGREE OF FILTRATION - A measure of the
effiency of a filter element. Expressed in terms of percentage retention of standard
contaminants, under defined test conditions (NOMINAL RATING); and the size in microns of
the largest hard spherical particle that will pass through the filter element (ABSOLUTE
RATING).
DIFFERENTIAL PRESSURE - The difference in
pressure between two points in a fluid system usually in filtration systems expressed as P
between a housing inlet and outlet.
DISPOSABLE FILTER ELEMENT - A filter
element which is not recleanable and is therefore discarded and replaced at the end of its
useful life. (Sometimes referred to as throwaway or non-cleanable element).
EFFECTIVE FILTRATION AREA - That area of
the fluid medium in a filter element which is exposed to flow.
NOMINAL FILTRATION RATING - An arbitary
micrometer value established by a filter manufacturer as a relative indication of aveage
filtration capability.
PERMEABILITY - The relationship of flow
per unit area to differential pressure across a filter medium.
PHOSPHATE ESTER BASE FLUIDS - Fire-resistant
hydraulic fluids.
PSID (P) - Pounds per square inch
differential.
PSIG - Pounds per square
inch gauge = PSIA minus atmospheric pressure (14.696).
RATED FLOW - The optimum flow rate for
which a filter is designed.
SPECIFIC GRAVITY - The ratio of the weight
of a given volume of material to the weight of an equal volume of water.
SAYBOLT SECONDS UNIVERSAL - (SSU) A measure of viscosity. The time in seconds for 60 cubic centimeters (cc) of oil to flow through a standard orifice at a specific
temperature.
VISCOSITY - A measure of the internal
friction or the resistance of a fluid to flow. The standard unit of measure is poise or
SSU. |
