Flow controlling dual hydrant

Details Flow controlling dual hydrant Flow controlling dual hydrant

2005-02-22

2005-02-22

Michalsky, Gerald A. (Department: 3753)

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

C137S360000, C137S606000

Reexamination Certificate

active

06857446

ABSTRACT:
In a dual hydrant, the combination comprising two spaced apart tubular bodies to receive in-flow of fluids A and B, a fluid mixing zone to receive fluids A and B from said bodies, manually operable flow control valves in the two tubular bodies, a primary check valve in one of the bodies to pass forward fluid flow toward said mixing zone, and to block reverse flow in the one body, an outlet from the mixing zone, and a secondary check valve in series with the outlet to pass forward flow from either or both of the two bodies through the outlet, and to block reverse flow from the outlet to the mixing zone.

REFERENCES:
patent: 2569857 (1951-10-01), Jaegle et al.
patent: 3828815 (1974-08-01), Botnick
patent: 4976279 (1990-12-01), King, Sr. et al.
patent: 5228471 (1993-07-01), Hoeptner, III
patent: 5752542 (1998-05-01), Hoeptner, III
patent: 6206039 (2001-03-01), Shuler et al.
patent: 6386223 (2002-05-01), Hoeptner, III

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