DescriptionBrass instrument traditional rotary valve diagram.svg
English: A brass instrument traditional rotary valve, in default position (A) and engaged (B). 1. airflow, from mouthpiece; 2. airflow, to bell; 3. valve tubing; 4. valve casing; 5. internal rotor; 6. valve ports, or "knuckles"; 7. rotor spindle. Based on a diagram (Fig. 1) in US Patent 4095504 (expired).
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