Diesel engine.
Diesel cycle

Endothermic engine

What is a butterfly valve?

What is a butterfly valve?

A butterfly valve is a device to regulate or interrupt the flow of a fluid in a conduit. The butterfly valve allows to increase or reduce the passage section by means of a plate which rotates on an axis. This plate is called a butterfly. By decreasing the fluid passage area, the local pressure drop in the valve increases, reducing fluid flow.


  • They are in all cases contained within the pipeline;
  • They have a low pressure drop when fully open.
  • The relationship between the pitch area and the angle of rotation of the butterfly is not linear.

Butterfly valves are used in air ducts, piping for liquids and in mechanical applications, as in some types of thermal motors.

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Last review: December 6, 2016