Glossary and index of fluid power principles and components I
IDENTIFICATION THREAD
A yarn of single or multiple colors, usually embedded in the hose wall, used to identify the manufacturer.
IMPEDANCE
The combination of AC and DC resistance in a circuit measured in ohms.
IMPRESSION
A design formed during vulcanization in the surface of a hose by a method of transfer, such as fabric impression or molded impression.
IMPULSE
An application of force in a manner to produce sudden strain or motion, such as hydraulic pressure applied in a hose.
IMPULSE SERVICE
An application parameter characterized by continuous cyclical pressure changes from low to high.
INDENTATION
1) The extent of deformation by the indentor point of any one of a number of standard hardness testing instruments. 2) A recess in the surface of a hose.
INDICATOR
A mechanical device with points to a scale to provide a visual perspective of the state of a component. See NEEDLE.
INPUT
Incoming signal to a control unit or system.
INTAKE LINE
A passage at the inlet port of a component, normally at the inlet port of a pump.
INSULATOR
A material that blocks the flow of current which is used for a short circuit and shock prevention.