A valve is a device that controls the flow of liquid, gas, or air.


  • An open valve allows liquid, gas, or air to move through pipes easily.
  • When the valve is closed, nothing flows through.

large valve

  • Valves are found on industrial equipment, in factories and plants.


  • The valves on a trumpet are controlled by a musician who blows air through the instrument to create different sounds.

heart valves

  • There are valves in your heart that control the flow of blood. These are called pulmonary valves.

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February 22, 2015