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Encyclopedia > Butterfly valve

A butterfly valve is a type of flow control device, typically used to regulate a fluid flowing through a section of pipe. The valve is similar in operation to a ball valve. A flat circular plate is positioned in the center of the pipe. The plate has a rod through it connected to a handle on the outside of the valve. Rotating the handle turns the plate either parallel or perpendicular to the flow. Unlike a ball valve, the plate is always present within the flow, therefore a pressure drop is always induced in the flow regardless of valve position. Image File history File links USPatent6518683. ... A ball valve (like the butterfly valve, one of a family of valves called quarter turn valves) is a valve that opens by turning a handle attached to a ball inside the valve. ... A ball valve (like the butterfly valve, one of a family of valves called quarter turn valves) is a valve that opens by turning a handle attached to a ball inside the valve. ...


There are three types of butterfly valve:

  1. Resilient butterfly valve which has a flexible rubber seat. Working pressure up to 1.6 megapascals (MPa)/232 pounds per square inch (PSI)
  2. High performance butterfly valve which is usually double eccentric in design . Working pressure up to 5.0 MPa/725 PSI
  3. Tricentric butterfly valve which is usually with metal seated design. Working pressure up to 10.0 MPa/1450 PSI

Butterfly valves are widely used in water distribution and waste water processing (not recommended, as the debris may block the operation of the disc). Butterfly valves can come in two body types, affecting installation and maintenance: lugged or wafer. Wafer style valves are more common. They are typically installed between two flanges using bolts or studs and nuts. Lug style valves are also installed between two flanges but with a separate set of bolts for each flange. The lug style setup makes it possible to remove one side of the piping while the other remains intact. The megapascal, symbol MPa is an SI unit of pressure. ... A pressure gauge reading in PSI (red scale) and kPa (black scale) The pound-force per square inch (symbol: lbf/in2) is a non-SI unit of pressure based on avoirdupois units. ...


An additional application is found within the exhaust system of automobiles. By incorporating a butterfly valve in the exhaust system, it is possible to control the backpressure and noise output from the muffler and catalytic converter. When in a closed position, the valve increases the amount of back pressure produced and suppresses noise. The angle of valve can be controlled in a variety of ways, including manual control, vacuum control, as well as being tired directly to the throttle. An exhaust system conveys burnt gases from an internal combustion engine and typically includes a collection of pipes. ... Muffler and exhaust pipe on a Ducati 695 A muffler (or silencer in British English) is a device for reducing the amount of noise emitted by a machine. ... Catalytic converter on a Saab 9-5. ...


See also

sgrrhy A ball valve (like the butterfly valve, one of a family of valves called quarter turn valves) is a valve that opens by turning a handle attached to a ball inside the valve. ... FBFDBDFBDFBDFB FBDFB.BCVBCVB . ... Plastic Pressure Pipe Systems have been in use since the 1950s. ... An exhaust pipe is usually a pipe used to guide waste exhaust gases away from a controlled combustion inside an engine or stove. ...


  Results from FactBites:
 
Butterfly valve - Wikipedia, the free encyclopedia (265 words)
A butterfly valve is a type of flow control device, used to regulate a fluid flowing through a section of pipe.
The valve is similar in operation to a ball valve.
Butterfly valves are widely used in water distribution and waste water processing (not recommended, as the debris may block the operation of the disc).
  More results at FactBites »

 
 

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