yes and no. yes, they do create a wider range of notes by giving the air different piping to travel through. and there are actually two types of valves: piston and rotary. the piston valves are pretty self explanatory- think of the valves in a carburetor for example). the other kind is the rotary valve which turns instead of going up and down. this kind is controlled by strings and springs.
because the valves were to big for fingures
The valves are used to change notes.
a trumpet is an instrument that is used in orchestra bands and is often used in jazz music. it is a brass instrument with three valves that change the pitch which will produce the notes.
The valves on the Euphonium or any brass instrument are used to change the length of tubing, allowing the player to reach various notes. Each valve pressed diverts the air stream through additional tubing, causing the pitch to change. Most Euphoniums have 4 valves but some have only 3, and nearly all current models are piston valved.
The trombone has a slide that can be moved to change the pitch of notes rather than valves or keys that lengthen the tubing to change the pitch of notes like other brass instruments. And there are a lot more than 3 other brass instruments.
A trombone does not need valves to change pitch because it uses a slide to produce various notes. Along the slide there are seven positions and each position can hit several notes, depending on how well you play.
Valves.
its not the valuve but the tightenous of the lips that gives the lower tones in conjunction with valves
Brass instruments produce sound by the vibrating of the player's embouchure in a mouthpiece, and the valves and slides on the instrument alter the length of the tubing in the instrument which affects the pitch of the notes produced. The farther the air has to travel in the instrument the lower the pitch of the sound is, whereas the less distance the air has to travel the higher the pitch the instrument will produce.
Trombones are played by moving a slide, while other brass instruments use valves to change notes.
Trumpets are brass instruments, so the players buzzes their lips and different speeds to produce the different pitches. Then, using the valves, you can produce all the notes for those keys - if you're good enough. Like all instruments, it takes a lot of practice.
You buzz your lips, which causes the trumpet to vibrate. You change notes by pressing valves or blowing the air faster.