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Glossary of terms used on this site

There are 823 entries in this glossary.
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Term Definition
CAD (Computer Aided Design)

Programs used to design architectural, mechanical and electrical engineering drawings.


(Sliding-Stem Valve Control Terminology) A part of a valve trim that surrounds the closure member and can provide flow characterization and/or a seating surface. It also provides stability, guiding, balance, and alignment, and facilitates assembly of other parts of the valve trim. The walls of the cage contain openings that usually determine the flow characteristic of the control valve.

Calender-van Dusen Equation

An equation that defines the resistance-temperature value of any pure metal that takes the form of RT = RO(1 + AT + BT2) for values between the ice point (0°C) and the freezing point of antimony (630.7°C) and the form RT = RO[1 + AT + BT2 + C(T-100)T2] between the oxygen point (-183.0°C) and the ice point (0°C).


To determine the indication or output of a device with respect to a standard.


The process of adjusting an instrument or compiling a deviation chart so that its reading can be correlated to the actual value being measured.

Calibration Curve

A graphical representation of the calibration report. Steady state output of a device plotted as a function of its steady state input. The curve is usually shown as percent output span versus percent input span.

Calibration Cycle

The application of known values of the measured variable and the recording of corresponding values of output readings, over the range of the instrument, in ascending and descending directions. A calibration curve obtained by varying the input of a device in both increasing and decreasing directions. It is usually shown as percent output span versus percent input span and provides a measurement of hysteresis.


The quantity of thermal energy required to raise one gram of water 1°C at 15°C.

CAM (Computer Aided Manufacturing)

Programs used to control manufacturing equipment.


(Control Valve Functions and Characteristics Terminology) Rate of flow through a valve under stated conditions.

Capacity (Valve)

(Process Control Terminology) The rate of flow through a valve under stated conditions.


A positively charged ion (Na+, H+).


The boiling of a liquid caused by a decrease in pressure rather than an increase in temperature.


Temperature scale where 0° = freezing and 100° = boiling point of water at sea level. Formerly known as Centigrade.

Celsius (centrigrade)

A temperature scale defined by 0°C at the ice point and 100°C at boiling point of water at sea level.

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