rotary valve designs for other instruments as well as trombones, such as the Willson Rotax valves found on many French horns and tubas, the Lätzsch "Full Flow" valve, the Greenhoe valve, the Kanstul "Controlled Resistance" valve, and the Edwards AR-1 valve. See also Brass instrument valve Hagmann valve External links The Orla Ed Thayer Tribute website References Brass instrument parts and accessories