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US 2009/0288722 A1Published application
Double Check Back Flow Prevention Device
AssigneeWCM Industries, Inc.
InventorsWilliam T. Ball, Eric Pilarczyk
Life of this patent
Estimating the term…
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.
Claims22
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 with 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:
- an inlet check spring positioned within said inlet volume, wherein said spring contacts an upper surface of said wall,
- an inlet check body positioned within said inlet check spring,
- an inlet check seal interconnected to said inlet check body that is adapted to selectively engage said seal, thereby opening and closing an aperture of said seal to control fluid flow from the valve cap into the inlet volume;
- 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.
10 more elements
A back flow prevention device, comprising:
- a valve body with a fixed inlet volume and a fixed outlet volume, the valve body also having a vent for allowing fluid from inside said valve body to escape;
- a valve cap;
- a seal positioned between said valve cap and said valve body;
- an inlet check valve positioned within said inlet volume;
- and
- an outlet check valve positioned within said outlet volume.
3 more elements
A back flow prevention device comprising:
- a body with a fixed inlet volume and a fixed outlet volume, the body also having an aperture;
- a cap;
- a primary means for sealing positioned between said cap and said body;
- an inlet means for selectively preventing flow of fluid positioned within said inlet volume;
- and
- an outlet means for selectively preventing flow of fluid positioned within said outlet volume.
3 more elements
A water delivery system comprising:
- a faucet associated with a water supply;
- a valve associated with said faucet that is adapted to selectively control the flow of fluid from the water supply through the faucet;
- and
- a double check valve associated with said faucet that prevents fluid from entering the water supply and that allows fluid within the faucet to drain therefrom when said valve is in the off position, said double check valve comprising:
- a valve body with a fixed inlet volume and a fixed outlet volume, the valve body also having a vent for allowing fluid from inside said valve body to escape,
- a valve cap,
- a seal positioned between said valve cap and said valve body,
- an inlet check valve positioned within said inlet volume, and
- an outlet check valve positioned with said outlet volume.
6 more elements
A back flow prevention device, comprising:
- a housing having a passageway configured for the transport of a fluid therethrough, the housing having an inlet and an outlet, said passageway encompassing a valve system consisting essentially of:
- a first check valve disposed in the passageway that allows fluid to flow through the passageway in the direction from the inlet to the outlet;
- and
- a second check valve disposed in the passageway that allows fluid to flow through the passageway in the direction from the inlet to the outlet;
- a diaphragm disposed in the passageway adapted to engage at least one of the first check valve and the second check valve;
- a vent in fluid communication with the passageway and located between the first and second check valves, said vent selectively isolated from the passageway by the diaphragm, said vent adapted to permit fluid located between the first and second check valves to exit the housing through the vent, whereby the back flow prevention device permits substantially all fluid to drain completely from said device.
3 more elements
A back flow prevention device, comprising:
- a housing having first and second ends and including a means for connecting to a fluid inlet line at said first end and for connecting a fluid outlet line to said second end;
- a central cavity within said housing;
- wherein said housing includes a valve system consisting essentially of first and second drain valves and is devoid of a third drain valve, said first drain valve located within said housing between said central cavity and said fluid inlet line to permit drainage of fluid from said fluid inlet line to said fluid outlet line end of said housing when said fluid outlet line is not connected thereto, and said second valve located within said housing between said central cavity and said fluid inlet line to control flow between said fluid inlet line and said central cavity, whereby the back flow prevention device permits substantially all fluid to drain completely from said device.
Dependencies are inferred from the claim text.