Patent ID: 8042565
Filing Date: 2011-10-25
Classification: E03C,F16K,Y10T

Abstract:
1. A back flow prevention device for interconnection to a sill cock, comprising: a valve body with threads that are adapted to receive a hose, said valve body also having an inlet volume and an outlet volume separated by an internally-disposed wall, a lower surface of said wall defining a valve seat, the valve body further including a vent that provides a flow path between the outside of the valve body and said inlet volume; a seal positioned within said valve body in a volume located adjacent to said inlet volume, said seal adapted to selectively block said vent; a valve cap interconnected to said valve body that is positioned within said volume that maintains the seal against said valve body, said valve cap having threads for interconnection to a sill cock of a faucet; an inlet check valve comprising: a drain spring positioned within said outlet volume that contacts said seat and a plunger that is adapted to engage a hose; an outlet check valve comprising: an outlet check body positioned within said drain spring, an outlet check seal interconnected to said outlet check body that is adapted to selectively engage said seat to either open a flow path between the inlet volume and outlet volume, or isolate the outlet volume from said inlet volume, thereby preventing fluid from flowing from an interconnected hose into the sill cock; and an outlet check spring positioned about said outlet check body that contacts a portion of said outlet check body and a hub of said plunger.