Double check back flow prevention device

Details Double check back flow prevention device Double check back flow prevention device

2008-05-23

2011-10-25

Scheider, Craig (Department: 3753)

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

Reexamination Certificate

active

08042565

ABSTRACT:
A double check valve is provided that includes an in-line inlet check valve and an outlet check valve that cooperate to prevent back flow of fluid through the valve. The check valve also includes at least one vent that allows for fluid trapped within the check valve to drain, thereby preventing freezing of the check valve and hydrant to which it is interconnected. The check valve provided omits many superfluous components and thus is smaller and easier to install than check valves of the prior art.

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“VB-22 Self-Draining Hose Connection Vacuum Breaker”, A.W. Cash Value Company Model VB-222, Mar. 12, 2008, pp. 1-2.
Official Action for Canadian Patent Application No. 2,666,533, dated Mar. 3, 2011.

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