| 摘要 |
A rotary valve for musical instruments is provided. The valve (30) is specially designed to have three internal passages (T1, T2, T3) with gentle curves and continuously circular passageways to provide true tonal qualities and a minimum of distortion. The valve passages have a bend radius of at least the diameter of the valve passage and the casing of the valve approximates three times the diameter of the passages. The valve passages to and from the loop are positioned on opposite sides of and cross over a through passage from the mouthpiece to the bell for economy of space and gentle passage curvature. The inlet and outlet openings in the loop engaging passages are located approximately 45-degree from one another along their axes to avoid substantial changes in the direction of air flow. The 45-degree angle is between diameters of the openings and can also be expressed as 135 degrees around the circumference of the rotor. Multiple valves for multiple loops are provided by rotating each subsequent valve 180 degrees. Valves with the internal and external short loops are also described.
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