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The axial flow valve, or Thayer valve, is a brass instrument valve design patented in 1978 by American inventor Orla Ed Thayer. [1] Designed with assistance from instrument maker Zigmant Kanstul, it was originally intended to replace the traditional rotary valve on the French horn , but instead revolutionized the design of trombone valve ...
This reduces acoustic impedance effects, providing a more open "feel" for the player and a "crisper" tone more similar to a standard trombone. [4] While the Hagmann valve does not achieve the low 20–25° angle of deflection in axial flow valves, it is still about as free-blowing and, being otherwise substantially similar to a standard rotary ...
The valve trombone emerged concurrently with the invention of valves in the early 19th century. Most early instruments retained the shape and form of the slide trombone, employing three valves with the tubing arranged in place of the slide; others used the new valve mechanism as an opportunity to explore different configurations while retaining the overall cylindrical bore and bell profile.
Axial flow valve in default (A) and engaged (B) positions. 1. airflow, from mouthpiece; 2. airflow, to bell; 3. valve tubing; 4. valve casing; 5. conical rotor; 6. input (a) and return (b) valve ports; 7. spindle axis of rotation. Axial flow valves are an alternative for the traditional rotary valve found on trombones with valve attachments.
The most common type of valve seen for valve attachments is the rotary valve, appearing on most band instruments, as well as most student and intermediate model trombones. Many improvements of the rotary valve, as well as entirely new and radically different valve designs, have been invented since the mid 20th century to give the trombone a ...
It was originally designed to be used as a marching trombone, and has valves rather than a slide thus superficially resembles a tenor horn or euphonium. [1] It was used by the University of Southern California Marching Band [ 1 ] and on a handful of jazz recordings (e.g., Jay and Kai + 6 ).
The contrabass trombone (German: Kontrabassposaune, Italian: trombone contrabbasso) is the lowest-pitched instrument in the trombone family of brass instruments.While modern instruments are pitched in 12 ft (12 ′) F with a single slide, the first practical contrabass trombones appeared in the mid-19th century built in 18 ′ B♭ an octave below the tenor trombone with a double slide.
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.