VALVE TRIM

The operating parts of a valve which are normally exposed to the process fluid are referred to as

'valve trim'. Usually these parts are subject to wear and degradation and hence are replaceable.

Usually parts like stem, closure member, seating surface etc. are called as valve trim. The parts

such as body, bonnet, yoke etc. are not considered as trim.

Following table represents a list of parts, which can be considered as trim for different types of

valves.

Type of Valves Valve Trim

Angle Valves Stem, Seat, Disc, Disc nut, back-seat bushing

Disc Valves Disc, Disc nut, back-seat bushing

Gate Valves Stem, Seat, wedge, back-seat bushing

Globe Valves Stem, Seat, Disc, Disc nut, back-seat bushing

Lift type check

Valves Seat ring, Disc, Disc guide

Swing type check

Valves

Seat ring, Disc, Disc holder, Disc holder pin, Disc nut, Disc nut pin, side

plug, carrier pin