The valves are used to change notes.
Valves for brass instruments weren't developed until around the year 1800.
They are called valves.
Yes, but there are trombones that do have valves. Bugles- no valves
Not all brass instruments have valves. For example, the trombone has a slide. The trumpet, euphonium, and french horn have three valves.
Valves!
Brass instruments such as the trumpet, cornet, French horn and tuba.
I'm no brass instrument, but rotary valves are used for several instruments. French horns all seem to have them. They're pretty common on tubas as well. There are even some rotary valve trumpets out there. I don't know, though, anything about the advantages and/or disadvantages of rotary valves as opposed to the piston valves that seem to be more common for most brass instruments.
No, a saxophone has keys like other woodwind instruments. Brass instruments have valves.
Trombones are played by moving a slide, while other brass instruments use valves to change notes.
All the other brass instruments because they have valves.
The way the valves on a brass instrument work is that when pressed down they allow air to pass through a piece of tubing, thus making the length of tubing of the trumpet longer, this allows valved instruments to be able to play more notes than instruments without valves.
Brass instruments are primarily made of brass, which is a metal alloy of copper and zinc. They are called brass instruments because the majority of their construction is made of brass, even though some parts, like valves and slides, may be made of other materials such as steel or nickel silver.