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What is Valve Trim?

Posted by Antony Thomas at Monday, December 15, 2014

Valve Trim is collective name for the internal elements of the valve. The Valve Trims are directly exposed to the process fluid except the body, bonnet, flanges and gaskets. As per API code Trim is defined as the seating surfaces of the body, disc, disc to shaft connection hardware (e.g., keys, pins, screws, etc.) and any internal fasteners that are in contact with the process fluid.

The Plug, seats, stem guides, bushing and cage are some of the parts we can say Valve trims.
Standard-Trim

Ball valve trim


















Type of Valves
Valve Trim parts
Gate Valves
Stem, Seat, wedge, back-seat bushing
Globe Valves
Stem, Seat, Disc, Disc nut, back-seat bushing
Ball Valves
Ball, stem and metal seats or seat retainers
Butterfly Valves
Disc, disc to shaft connection, keys, pins, and screws etc
Angle Valves
Stem, Seat, Disc, Disc nut, back-seat bushing
Seat ring, Disc, Disc holder, Disc holder pin, Disc nut, Disc nut pin, side plug, carrier pin
Disc Valves
Disc, Disc nut, back-seat bushing
Seat ring, Disc, Disc guide

See Type of Check valves and Description
“What is Valve trim?”
VALVE PARTS AND TERMINOLOGY

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