Music Term: Disc valve or "patent lever valve"
Disc valve or "patent lever valve"
Definition and background:
Valve characterized by the use of two discs facing each other, one fixed, the other rotating. The rotating disc either blocks the valve slide (left) or allows free passageway to it (right), hence increasing the overall tube length of the instrument.
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Wikipedia - Glossary of Musical Terminology
Virginia Tech Multimedia Music Dictionary
ORB -- Medieval Music Glossary