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active component
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A component characterized by being a source of activity in a fluid system. Active fluid components such as pumps perform an action on hydraulic and pneumatic fluids.
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AISI
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The American Iron and Steel Institute. AISI is an association responsible for setting standards and creating numbering systems for various ferrous metals.
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ASTM
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The American Society of Testing and Materials. The ASTM writes and updates specifications for a broad range of materials, including fluid conductors.
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brazed
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Joined using a filler metal melted at a temperature above 1540°F (840°C), but below the melting point of the base components.
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burst pressure
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The pressure rating that indicates the pressure at which a conductor failed during a pressure rating test.
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cartridge valve
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A fluid valve that is screwed directly onto a manifold port.
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conductor
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A component such as pipe, tube, or hose that conveys liquids within a hydraulic system.
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contaminant
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Any foreign substance that may cause a loss of efficiency or a breakdown in a fluid system.
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cover
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The outermost layer of hose that protects the inner layers from the environment and wear.
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crest
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The high point or peak of a thread.
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drilled metal block manifold
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A manifold made of steel, aluminum, or cast iron that is drilled to make fluid passages.
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dryseal
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A sealing condition caused by the crest of one thread contacting the root of another thread. Dryseals do not allow fluid to leak from a fluid system.
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external leakage
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The unintentional movement of fluid from a system into the environment.
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fatigue life
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The length of time a conductor remains in service. Conductors with a low fatigue life do not last long under normal working conditions.
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fitting
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A fluid component that connects, redirects, extends, or terminates the run of a fluid conductor.
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flank
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The side of a thread between the root and crest.
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flow rating
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An indication of the volume of fluid that a conductor can handle in a given time.
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force multiplication
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The exponential increase in available power usually associated with tools and power transmission systems.
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hoop strength
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The resistance of a fluid conductor to inside pressure. Hoop strength indicates the ability of a conductor to maintain its structural integrity.
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hose
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A type of hydraulic fluid conductor that joins other components usually in a non-linear fashion. Hose bends and flexes and is the most versatile hydraulic conductor.
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inner tube
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The innermost layer of hose which contacts the fluid.
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inside diameter
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The interior surface of a cylindrical part or hole.
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internal leakage
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The unintentional movement of fluid from one component to another.
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laminar manifold
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A manifold that is comprised of several layers of metal that are brazed together.
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leakage
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The unintended movement of fluid either out of a fluid system or from one fluid component to another. Leakage causes a loss of effiency and often leads to system failure.
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manifold
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A block of metal with multiple integrated channels designed to conduct fluid in confined spaces.
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minimum bend radius
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A value indicating the limit beyond which a hose should not be bent. If a minimum bend radius is exceeded, a hose will not perfom properly.
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modular-block manifold
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A fluid conductor that usually supports one valve and is designed to be used in conjunction with other manifolds and fluid components.
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nominal size
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The size by which pipe is known and sold in the fluid component market. The nominal size of pipe differs from the actual size of pipe.
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nonpositive seal
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A seal that allows a small amount of fluid to pass through.
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outside diameter
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The exterior surface of a cylindrical or round feature.
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passive component
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A component characterized by inactivity. Passive fluid components such as conductors do not perform an explicit action on fluids, but allow fluids to act upon them.
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pipe
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A type of hydraulic fluid conductor that joins other components, usually in a straight line and on a permanent basis.
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plug
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A pipe fitting that terminates a run by closing an end. A plug has male threads.
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positive seal
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A seal that does not allow any amount of fluid to pass through.
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pressure rating
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An indication of the amount of pressure a fluid conductor can withstand.
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radius die
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A bending mechansim used to bend a tube to a particular radius specification.
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reinforcement
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A layer of woven material used to strengthen a hose. Hose may have several layers of reinforcement.
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root
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The bottom of a thread valley.
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SAE
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The Society of Automotive Engineers. SAE writes specifications and other data used in a broad range of industries.
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safety factor
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The ratio of burst strength to working strength. A conductor with a safety factor of 5:1 has a burst pressure that is 5 times the working pressure.
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schedule number
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A number that describes the thickness of a pipe wall.
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single-piece manifold
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A fluid conductor that contains the fluid passages and valves of a complete system.
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socket weld flange
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A device that is welded to the end of pipe so that the pipe can be bolted to another pipe with a similar flange. Socket weld flanges enable a pipe to be disconnected and reconnected with ease.
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spiral clearance
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The presence of space between the root of one thread and the crest of another along the entire length of the thread. Spiral clearance allows fluid to leak from a fluid system.
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support
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A mechanical device that fixes and stabilizes the position of a fluid conductor.
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tapered
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Gradually decreasing in size from one end of the object to the other.
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tensile strength
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The ability of a metal to resist forces that attempt to pull apart or stretch it.
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threads
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A raised, helical ridge around the interior or exterior of a cylindrically shaped object. Threads are found on conductors and fittings and are used to join components of a fluid system.
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threads per inch
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TPI. The number of threads in a linear inch along the length of a workpiece.
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tubing
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A type of hydraulic fluid conductor that joins other components usually in a non-linear fashion. Despite being stronger than pipe, tubing is easily bent.
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wall thickness
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A value that indicates the thickness of the tubing wall. Wall thickness may remain unchanged as the outside diameter and inner diameter change.
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working pressure
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The pressure rating that indicates the maximum pressure a conductor should experience in service.
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