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Glossary of terms used on this site

There are 823 entries in this glossary.
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Term Definition
Actuator Lever

(Rotary-Shaft Control Valve Terminology) Arm attached to rotary valve shaft to convert linear actuator stem motion to rotary force to position disk or ball of rotary-shaft valve. The lever normally is positively connected to the rotary shaft by close tolerance splines or other means to minimize play and lost motion.

Actuator Spring

(Sliding-Stem Control Valve Terminology) A spring, or group of springs, enclosed in the yoke or actuator casing that moves the actuator stem in a direction opposite to that created by diaphragm pressure.

Actuator Stem

(Sliding-Stem Control Valve Terminology) The part that connects the actuator to the valve stem and transmits motion (force) from the actuator to the valve.

Actuator Stem Extension

(Sliding-Stem Control Valve Terminology) An extension of the piston actuator stem to provide a means of transmitting piston motion to the valve positioner.

Actuator Stem Force

(Sliding-Stem Control Valve Terminology) The net force from an actuator that is available for actual positioning of the valve plug.

Adapter

A mechanism or device for attaching non-mating parts.

ADC

Analog-to-Digital Converter: an electronic device which converts analog signals to an equivalent digital form, in either a binary code or a binary-coded-decimal code. When used for dynamic waveforms, the sampling rate must be high to prevent aliasing errors from occurring.

Address

The label or number identifying the memory location where a unit of information is stored.

Air Damped

A construction utilizing an air vane to achieve movement damping. This vane is usually housed in a closed chamber to increase the damping action.

Aliasing

If the sample rate of a function (fs) is less than two times the highest frequency value of the function, the frequency is ambiguously presented. The frequencies above (fs/2) will be folded back into the lower frequencies producing erroneous data.

Alloy 11

A compensating alloy used in conjunction with pure copper as the negative leg to form extension wire for platinum-platinum rhodium thermocouples Types R and S.

Alloy 200/226

The combination of compensating alloys used with tungsten vs. tungsten 26% rhenium thermocouples as extension cable for applications under 200°C.

Alloy 203/225

The combination of compensating alloys used with tungsten 3% rhenium vs. tungsten 150 rhenium thermocouples as extension cable for applications under 200°C.

Alloy 405/426

The combination of compensating alloys used with tungsten 5% rhenium vs. tungsten 26% rhenium thermocouples as extension cable for applications under 870°C.

ALOMEGA®

An aluminum nickel alloy used in the negative leg of a type K thermocouple (registered trademarks of OMEGA ENGINEERING, INC.).

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