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Glossary of terms used on this site

There are 823 entries in this glossary.
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Term Definition
Valve Body

(Sliding-Stem Control Valve Terminology) The main pressure boundary of the valve that also provides the pipe connecting ends, the fluid flow passageway, and supports the seating surfaces and the valve closure member. Among the most common valve body constructions are: a) single-ported valve bodies having one port and one valve plug; b) double-ported valve bodies having two ports and one valve plug; c) two-way valve bodies having two flow connections, one inlet and one outlet; d) three-way valve bodies having three flow connections, two of which can be inlets with one outlet (for converging or mixing flows), or one inlet and two outlets (for diverging or diverting flows). The term valve body, or even just body, frequently is used in referring to the valve body together with its bonnet assembly and included trim parts. More properly, this group of components should be called the valve body assembly.

Valve Body Assembly (Commonly Valve Body

(Sliding-Stem Control Valve Terminology) An assembly of a valve, bonnet assembly, bottom flange (if used), and trim elements. The trim includes the closure member, which opens, closes, or partially obstructs one or more ports.

Valve Plug

(Sliding-Stem Control Valve Terminology) A term frequently interchanged with plug in reference to the closure member.

Valve Stem

(Sliding-Stem Control Valve Terminology) In a linear motion valve, the part that connects the actuator stem with the closure member.

Velocity loop

A feedback control loop in which the controlled parameter is motor velocity. Usually uses a tachometer for a feedback device.

Vena Contracta

(Control Valve Functions and Characteristics Terminology) The portion of a flow stream where fluid velocity is at its maximum and fluid static pressure and the cross-sectional area are at their minimum. In a control valve, the vena contracta normally occurs just downstream of the actual physical restriction.

Volume Booster

A stand-alone relay is often referred to as a volume booster or simply booster because it boosts, or amplifies, the volume of air supplied to the actuator. (See Relay.)


A fail-safe mechanism that can be used to set I/O points to a "safe" state if communications with the controller is lost.

WMS (Warehouse Management System)

Software that integrates activities performed mechanically and by humans with an information system to effectively manage warehouse business processes and direct warehouse activities.

X10 Protocol

A powerline carrier protocol that allows compatible devices throughout the home to communicate with each other via the existing 220V or 110V wiring in the house. Visit for more information.


(Sliding-Stem Control Valve Terminology) The structure that rigidly connects the actuator power unit to the valve.

Zero Error

Error of a device operating under specified conditions of use when the input is at the lower range value. It is usually expressed as percent of ideal span.

ZIF connector (Zero-Insertion-Force conn

A connector for which male and female contacts do not initially touch each other while the connector halves are being engaged. Instead, the halves are physically positioned together, and then a turn of an actuating cam arrangement mates all the contacts at once.

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