Bicycle tube valves are one-way valves. They let air pass one way, then holds it in.
Read the tube! No. Body piercing is considered a deep puncture wound.
They were called thermionic valves. there was also the cathode ray tube (CRT)
That's a strange question. When you say valve I think about bike tire tube valves. These you generally get with the tubes. The only tube for which valves are regularly replaced are the ones with Dunlop valves, which are pretty rare outside Scandinavia. Then there are tubeless tire systems, but for a valve for those you turn to the rim/tire manufacturer.
Valves, tuning slide, and spit valves.
they tend to over time
Instead of valves, trombones have a movable slide. When extending the slide it causes the tube to be longer and this impacts along with lip configuration to changing the note and pitch
since there are so many valves, and they are rotory valves, there are actual tubes for each valve, including a valve for the trigger and a valve for no buttons as well. there are not as many valves on the trumpet because they have a different type of valves: the valves of the trumpet work like when you press down the button, the actual valve moves and a hole opens so it shows that the button was pushed down so the pitch comes through. there is only one necessary tube on the trumpet, because the valves are just holes in the tube. this is different on horn, because there are different tubes for each valve. the horn valves are rotors, so when you press down the button, the rotor moves and opens a hole. there is a different rotor for each valve, which means that every valve MUST have its own tube. this is why there are so many tubes on the horn:]
A french horn is played into a mouthpiece that travels along a tube down and back up to a main tuning slide, usually containing a "spit valve". Then, it travels through a network of rotating valves and through a larger tube out. On a double horn, however, after the first network of valves, it can decisively travel through another tuning slide and through more valves to the same exit.
We have stopped using lamps valves or any sort of bulbs aside from the picture tube many years ago so you Will get 1 at best. the tube.
That anti bacterial stuff in a yellow tube. It has vaseline consistancy & kills germs.
The valves when depressed insert extra tubing into the air stream which alters the resonance of the tube overall.