US 2006/0213565 A1 · Eductor apparatus

Abstract

An eductor assembly includes an inlet connectable to a high pressure water source useful in firefighting, an outlet connectable to a fire hose and/or nozzle, and a venturi therebetween. An additive inlet communicates with the venturi so that a chemical additive, such as a foam concentrate, is educed into the output stream. A check valve is positioned at the additive inlet to open under venturi flow conditions and remain closed otherwise. An actuator is provided that holds the check valve in its open position while water flows through the eductor assembly under non-venturi conditions to produce a back flow through the additive inlet and ultimately through the additive fluid circuit, including the additive metering valve components. A return element may be disposed within the eductor body to return the check valve to its closed position when the back flow ceases.

Claims26

Dependent claims

An eductor assembly for use with firefighting equipment comprising:

an eductor body defining a fluid inlet connectable to a source of a firefighting fluid, a fluid outlet for dispensing fluid therefrom in fluid communication with said fluid inlet, an additive inlet connectable to a source of an additive to the firefighting fluid and in fluid communication with said fluid outlet;
a check valve disposed between said additive inlet and said fluid outlet and moveable, in response to a flow of firefighting fluid through said fluid inlet, between a first position operable to prevent back flow of firefighting fluid through said additive inlet and a second position to permit flow of additive through said additive inlet to said fluid outlet;
and
an actuator operable from outside said eductor body to move said check valve to said second position.

1 more element

Dependencies are inferred from the claim text.

Eductor apparatus

Life of this patent

Eductor apparatus

Life of this patent

Abstract

Claims26