What is an foam eductor?
The NFPA definition is "a device placed in a hose line to proportion liquid foam or wetting agent into the fire stream".
How does an eductor work?
An eductor utilizes the energy in the form of pressure, which is in the water stream, to create a low pressure area and, thereby, induct and mix theconcentrate into the stream.
The venturi near the inlet of the eductor increases the velocity of the water. The venturi is just like a very efficient solid bore tip. The water passes into the induction chamber, which has a larger area than the orifice of the venturi, thereby creating a low pressure area. A separate orifice, or series of orifices, ntrols the flow of concentrate into the low pressure area. The rest of the eductor is designed to recover as much of the inlet pressure as possible.
What is a bypass eductor?
A bypass eductor has two separate flow paths. One side of the bypass eductor is exactly the same as a standard inline eductor. The other side is a straight through flow path, without the friction loss of an eductor. This device can be used in a hose line in the bypass mode for flowing water. (Be sure foam supply is off when using bypass or foam may be educted, since eductor line is open). When foam is required, the bypass valve can be changed to force the flow of water through the eductor.
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