(http://www.valve-type.blogspot.com) A valve is a mechanism which changes the length of the tube, or body of a wind instrument; it allows you to play a wider range of notes. A piston valve features a that moves up and down in a casing; a rotary valve changes the air passage by means of a rotor activated by a lever.
in the blog we will introduce many different types of valves to you. the basic valve types can be divided into two general groups: stop valves and check valves.
3 条评论:
nice photos
thank you!
The heading too little,so I can`t see it.
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