| 摘要 |
A low friction vented rotary valve for a brass instrument is disclosed comprising a partially circumferential member providing a low friction engagement with the rotary casing. The partially circumferential member has first, second and third apertures therein with a first tube connected between the first and second apertures and a second tube connected at one end of the circumferential member. The second tube has an arcuate collar at its other end for providing another low frictional surface engaging the rotor casing.
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