Glossary and index of fluid power principles and components
Society of Automotive Engineers
SAE 4 BOLT PORT, CODE 61
A system for flange and surface mounting configurations that are used to attach pipes, tubes or hoses to a component or manifold. Normally rated at 3000 psig. See SAE 4 BOLT PORT, CODE 62.
SAE 4 BOLT PORT, CODE 62
A system of flange and surface mounting configurations that are used to attach pipes, tubes or hoses to a component or manifold. Nominally rated at 6000 psig, although larger sizes are only See SAE 4 BOLT PORT, CODE 61.
A threaded hole and stud system that may be used to attach fittings to a component or manifold. Sealed with an o-ring or gasket.
The ratio of burst pressure to rated pressure under specific static pressure and temperature conditions. See BURST PRESSURE.
A metal or synthetic ring that is fitted to the shaft of a cylinder to remove particles from the shaft so to prevent them from entering the cylinder seal chamber.
See O-RING and GASKET.
The minimum input signal required to produce a specified output signal.
-The order of a series of operations or movements. -To divert flow to accomplish a subsequent operation or movement
A valve that is normally closed or normally open and changes to the opposite state when pilot pressure is applied to its spring chamber at a preset pressure level. Normally used to initiate a secondary set of operations in a system, based on application of the pilot signal.
SERIAL DATA TRANSMISSION
A form of digital data transmission in which the data bits of a binary word are processed or transmitted one at a time. Slower than parallel data transmission, but does not require separate circuitry for each bit.
Bumps, barbs, corrugations, or other features increasing the holding power of the device.
A term used to describe the type of electronic system used for finite, analog control of a function. See SOLENOID CONTROL.
A valve that uses a torque motor type coil to control a small stream of fluid. Direction of the fluid stream is used to position a large spool. Therefore a low level power signal may provide precise spool position. Normally, the spool had mechanical feedback of spool position to the torque motor, creating a closed loop spool position system.
The portion of a fitting inserted into the bore of a hose.
A valve that has three ports and a common ball or spool check valve. When flow is applied at either of the two inlet ports, the third or output port receives flow from the higher pressure inlet port.
The removal of a short length of cover and/or tube to permit the attachment of a fitting directly over the hose reinforcement.
Fine particles of debris. Normally found in chambers with little or no circulation, such as at the bottom of a reservoir or tank. See SLUDGE.
Internal leakage of hydraulic fluid.
Partially hardened silt. See SILT.
The external member or portion of a hose fitting, commonly used in describing screw-together reusable fittings.
A coil of metallic wire, usually copper, wound around a bobbin. Used to magnetize the bobbin and produce linear motion of a companion spool when electricity is applied.
A method of applying reinforcement in which there is no interlacing between individual strands of reinforcement; coiling around an axis in a series of planes, helical.
A term loosely applied to almost any moving cylindrically shaped part of a hydraulic component which moves to direct flow through the component.
A helically wound component applied internally or externally to a hose assembly, used to strain relief, abrasion resistance, or collapse resistance.
Ability of a system to maintain control when subject to severe outside disturbances.
A document, or an object for physical comparison, for defining product characteristics, products, or processes, prepared by a consensus of a properly constituted group of those substantially affected and having the qualifications to prepare the standard for use.
Describes how a control system, or an individual unit, carries on under fixed conditions (As contrasted to dynamic behavior which refers to behavior under changing conditions).
Having the capability of furnishing a path for a flow of static electricity.
The change from one value to another in a single step.
A measurement of pressure that is present when no fluid flow exists in a passage. The static head is normally expressed in feet of water.
A series of wire or fabric meshes which are bonded together by caps or perforated cylinders and are fitted into hydraulic system passages to strain particles from fluid passed through the passage.
-The length of travel of a piston or plunger. -To change the displacement of a variable displacement pump or motor.
A metal base to which a specific valve may be attached using a specified bolt kit.
A passage that leads from a reservoir or tank to the inlet port of a pump.
To replenish a hydraulic system above atmospheric pressure.
An increase in pressure that occurs for a specified short period of time over the normal expected working pressure.
The method of fitting attachment incorporating a set of die halves designed to progressively reduce the collar or ferrule diameter to the required finish dimension by mechanically forcing the fitting into the mating die.
A stationary canted plate in an axial type-piston pump which causes the pistons to reciprocate as the cylinder barrel rotates.
An increase in the volume or linear dimension of a specimen immersed in liquid or exposed to a vapor.
A digital device which closes or opens a discrete set of contacts at a pre-set condition.
A connector or fitting that is equipped with seals or o-rings allowing partial rotation while passing a fluid path through a sealed internal passage.
A rotary electromagnetic device generally used as an AC feedback signal generator which indicates position. It can also be used as a reference signal generator.
A hydraulic oil (fluid) that is made from a synthetic base. A fluid, manufactured to specified characteristics. Normally will not support combustion if heated to a specific temperature.
See OPERATING PRESSURE.