Back flow preventer made of at least two different types of...

Details Back flow preventer made of at least two different types of... Back flow preventer made of at least two different types of...

2006-03-21

2006-03-21

Fox, John (Department: 3753)

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

C137S512000

Reexamination Certificate

active

07013910

ABSTRACT:
A back flow preventer is provided that is made of at least two different materials. The back flow preventer includes a housing that has a passageway configured for the transport of a fluid therethrough. The housing has both an inlet and an outlet that define at least a portion of the passageway. The inlet is made of a different material than the outlet. A first and second check valve are disposed in the passageway. Both of the check valves allow fluid to flow through the passageway in the direction from the inlet to the outlet of the housing.

REFERENCES:
patent: 4139469 (1979-02-01), Rainin et al.
patent: 5228470 (1993-07-01), Lair et al.
Watts Publication, 1998.
Conbraco Pulication, 2000.
http://www.neoperl.com/products/checkvalves/features.asp.
http://www.neoperl.com/products/checkvalves/principles.asp.

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