Hornbostel - Sachs
The air itself is the vibrator in the primary sense. The standing waves are significantly confined within the instrument itself. The air-stream passes through the player's vibrating lips, so gaining intermittent access to the long air column which is to be made to vibrate. The tubular body has a bore profile that is predominantly cylindrical. The body can be lengthened or shortened by connecting or disconnecting auxiliary lengths of tube. Most valve trombones.
Valve trumpets with long air column (more than 2 m)
Valve trumpets