The valves are used to change notes.
Valves for brass instruments weren't developed until around the year 1800.
Yes, but there are trombones that do have valves. Bugles- no valves
They are called 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 acquired valves in the early 19th century, around the 1810s. This innovation allowed for greater versatility and range, enabling musicians to play a full chromatic scale more easily. The development of valves significantly transformed brass instrument design and performance, leading to the modern brass instruments we recognize today.
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.
Trombones are played by moving a slide, while other brass instruments use valves to change notes.
No, a saxophone has keys like other woodwind instruments. Brass instruments 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.
All the other brass instruments because they have valves.