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GLOSSARY
OF TERMS

YOUR COMPLETE GUIDE TO VALVE TERMINOLOGY

Our comprehensive guide to valve industry terminology is a valuable resource, whether you’re learning about the industry for the first time or refreshing your knowledge.

THROTTLING

Modulating control as opposed to on/off control.

TRANSDUCER

An element or device that receives information in the form of one quantity and coverts it to information in the form of the same or another quantity.

TRAVEL

The distance the plug or stem moves to go from a fully closed to a fully open position. Also called stroke.

TRIM

Includes all the parts that are in flowing contact with the process fluid except the body, bonnet and body flanges and gaskets. The plug, seats, stem, guides, bushings and cage are some of the parts included in the term trim.

TURNDOWN

A term used to describe the ratio between the minimum and maximum flow conditions seen in a particular system. For example, if the minimum flow were 10 G.P.M. and the maximum flow were 100 G.P.M. the turndown would be 10:1. See rangeability.