摘要:
Since the casing newly developed for the entire valve block of a brasswind instrument is made of resin, the dimensions of all inner movable parts can be increased without increasing substantially the weight of the entire valve block. This additional degree of freedom in design allows for planning and manufacturing of both inner sound channels and switching channels of movable inner parts so that they have a perfectly circular profile and a smooth inner surface. Therefore, by providing an ideal sound channel without increasing the overall weight of the valve block, a considerable improvement in the sound quality of an instrument can be achieved.