airflow of rotary valve in two positions

A rotary valve is a type of valve in which the rotation of a passage or passages in a transverse plug regulates the flow of liquid or gas through the attached pipes. For other uses see Valve (disambiguation. For the electronic component see Thermionic valve. The common stopcock is the simplest form of rotary valve. Rotary valves have been applied in numerous applications, including:

• Changing the pitch of brass instruments. A brass instrument is a Musical instrument whose tone is produced by vibration of the lips as the player blows into a tubular Resonator.
• Controlling the steam and exhaust ports of steam engines, most notably in the Corliss engine. A steam engine is a Heat engine that performs Mechanical work using Steam as its Working fluid. A Corliss steam engine (or Corliss engine) is a Steam engine, fitted with Rotary valves and with Variable valve timing, invented by and named
• Periodically reversing the flow of air and fuel across the open hearth furnace. Open hearth furnaces are one of a number of kinds of Furnace where excess carbon and other impurities are burnt out of Pig iron to produce steel.
• Loading sample on chromatography columns

Use in brass instruments

In the context of brass instruments, rotary valves are found on French horns, trumpets, trombones, and tubas. Chromatography (from Greek χρώμα chroma, color and γραφειν"graphein" to write is the collective term for a family of Laboratory A column in Structural engineering is a vertical structural element that transmits through compression, the weight of the structure above to other structural A brass instrument is a Musical instrument whose tone is produced by vibration of the lips as the player blows into a tubular Resonator. The trombone is a Musical instrument in the brass family Like all brass instruments it is a lip-reed Aerophone: sound is produced when the player’s Mediatubaogg -->The tuba is the largest and lowest pitched Brass instrument. Many European trumpet players tend to favor rotary valves. The valve on trombones with an f-attachment is a rotary valve. The trombone is a Musical instrument in the brass family Like all brass instruments it is a lip-reed Aerophone: sound is produced when the player’s

Joseph Riedlin is credited with the rotary valve for brass instruments in 1832.

Use in industry

In industry, a rotary valve (which can also be called Airlock) is often used to enter or extract material from two chamber with different pressure level.

As part of the material exchange process, the valve is often used as a measuring or metering device.

Coates' International Ltd. has developed a spherical rotary valve for internal combustion engines which replaces the poppet valve system. The spherical rotary valve combustion engine possesses several significant advantages over the conventional poppet valve assembly, including significantly higher compression ratios.

Use in chromatography

The most common use of a rotary valve is for loading samples on columns used for liquid or gas chromatography. The valves used in these methods are usually 6-port, 2-position rotary valves.

See also

• Airlock
• Rotary feeder