Glossary and index of fluid power principles and components E
A wall of varying thickness
The condition resulting from the inside and the outside diameters not having a common center. See eccentric wall.
The ratio of output to input. Volumetric efficiency of a pump is the actual output, in gpm, 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 percent.
The escape, usually of gases, through a material. See permeation.
The limiting extent to which a body may be deformed and yet return to its original shape after removal of the deforming force.
Any one of a group of polymeric materials, usually designated thermoset, such as natural rubber, or thermoplastic, which will soften with application of heat.
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.
ELECTROMAGNETIC INTERFERENCE (EMI)
A modification of signals contained in circuit wiring (or stored in a microprocessor) caused by a strong magnetic flied radiated from some other electrical or electronic device or conductor.
ELECTROMOTIVE FORCE (EMF)
The force produced by a difference of electrical potential that causes current to flow in circuit. EMF is measured in units called volts.
The sudden discharge of static electricity from an area of buildup to a grounding point.
See FILTER ELEMENT
The increase in length expresses numerically as a percentage of the initial length.
A rectangle drawn around a graphical component or components to indicate the limits of an assembly.
A service or laboratory test conducted to product failure, usually under normal use conditions
Ethylene Propylene Diene Monomer; an elastomer.
Degradation of a surface which is the result of mixtures of fluid and air or fluid and dirt particles passing over the surface at the same time as a change in pressure occurs.
The signal which is the algebraic summation of an input signal and feedback signal.
A passage that is open to atmosphere. Normally used in systems using pressurized air or gas which may be dispersed into the atmosphere.
Forced through the shaping die of an extruder; extrusion may have a solid or hollow cross section.