Glossary and index of fluid power principles and components

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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.