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How Foam Eductors Work?

Maya Lin-Takahashi • • 6 min read
How Foam Eductors Work?

An eductor is a device that uses the Venturi principle

Venturi principle
Giovanni Battista Venturi (11 September 1746 – 10 September 1822) was an Italian physicist, savant, man of letters, diplomat and historian of science. ... Because of this discovery, he is the eponym for the Venturi tube, the Venturi flow meter and the Venturi pump.
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to introduce foam concentrate into the water stream. ... A metering valve is attached to an inlet to this chamber and when open allows the higher atmospheric pressure outside the chamber to push the foam concentrate into the chamber.

Which principle is used in foam eductor?

Foam Eductor is a device that uses the venturi principle to introduce a proportionate amount of liquid concentrateinto a water stream. This venturi principle is used in the foam Eductors to induce foam or other liquid agents into a fire control stream.

What do you pump a foam inductor at?

Eductors are typically pumped with a 200-psi inlet pressure. This is due to the high friction loss, roughly 30 percent, through the small Venturi area. The pick-up tube can be placed in a foam bucket or attached to a foam tank supply.

Maya Lin-Takahashi
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Maya Lin-Takahashi

Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.