Abstract: A valve block for a valve assembly of a wind musical instrument, said valve block comprising a monolithic structure having a plurality of parallel and linearly spaced apart valve bores extending at least partially therethrough and for receiving a corresponding plurality of valve pistons therein an air ingress port extending through the valve block from external of the valve block and providing fluid communication between external of the valve block and a first valve bore; an air outlet port extending through the valve block from external of the valve block and providing fluid communication between external of the valve block and a further valve bore; transverse connecting passageways for providing fluid communication between adjacent valve bores; and a plurality of pairs of tuning section ports with each pair extending through the valve block from external of the valve block and providing fluid communication between external of the valve block and a valve bore.

Abstract: A dual rotor axial-flow rotor valve structure includes a rotor valve seat for rotatably receiving rotatable first and second rotor valves. The rotor valve seat has a first and a second extension sections connected to end sections of a second and a first tuning slide assembly s. The first rotor valve communicates with end sections of first and second flow passages with a mouthpiece and the other end of the second tuning slide assembly and communicate the other end of the second flow passage with the first or second extension section. The second rotor valve communicates ends of the first and second flow passages with the other end of the first tuning slide assembly and a main tuning slide assembly and communicate the other end of the second flow passage with the first or second extension section.