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The axial flow valve, or Thayer valve, is a brass instrument valve design patented in 1978 by Orla Ed Thayer. [1] Designed with assistance from Zigmant Kanstul, it was originally intended to replace the traditional rotary valve on the French horn , but instead revolutionized the design of trombone valve attachments . [ 2 ]
Hagmann valve, in default (A) and engaged (B) positions, top (above) and side view (below). 1. air flow, from mouthpiece; 2. air flow, to bell; 3. air flow to and from valve tubing; 4. valve casing; 5. valve cap; 6. straight-path valve port; 7. valve ports, to tubing emerging at the top of the valve casing; 8. spindle axis of rotation.
Axial flow valves are an alternative for the traditional rotary valve found on trombones with valve attachments. Patented by Orla Ed Thayer in 1978, it uses a conical rotor with the spindle axis parallel to the tubing, and deflecting the direction of the airflow by only 28° or less.
Trombone F attachment valves are usually rotary, with several variations on the basic design also in use, such as the Thayer axial flow valve and the Hagmann valve. Rotary valve was first applied to the horn in 1824 by Nathan Adams (1783–1864) of Boston and patented in 1835 by Joseph Riedl. [5] Tuba with 4 rotary valves, by Yamaha
Axial flow compressors produce a continuous flow of compressed gas, and have the benefits of high efficiency and large mass flow rate, particularly in relation to their size and cross-section. They do, however, require several rows of airfoils to achieve a large pressure rise, making them complex and expensive relative to other designs (e.g ...
An axial-flow pump for industrial use. An axial-flow pump, or AFP, is a common type of pump that essentially consists of a propeller (an axial impeller) in a pipe.The propeller can be driven directly by a sealed motor in the pipe or by electric motor or petrol/diesel engines mounted to the pipe from the outside or by a right-angle drive shaft that pierces the pipe.
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