Automatic draining 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.
Claims16
A back flow prevention device, comprising:
- a valve body with a fixed inlet volume;
- and
- an inlet check valve positioned within said inlet volume, said inlet check valve comprising:
- an inlet check spring positioned within said inlet volume;
- an inlet check body partially positioned within said inlet check spring;
- an inlet check seal fixedly interconnected to a groove in said inlet check body;
- wherein said valve body further comprises a fixed outlet volume, wherein said inlet volume and said outlet volume are separated by a wall;
- and
- an outlet check body positioned within said fixed outlet volume, wherein said inlet check body is slidingly interconnected to said outlet check body, and wherein said inlet check body and said outlet check body are configured to selectively open a flow path between said inlet volume and said outlet volume or isolate said inlet volume from said outlet volume.
A back flow prevention device, comprising:
- a valve body with a fixed outlet volume;
- an outlet check valve positioned within said outlet volume, said outlet check valve comprising:
- an outlet check spring positioned within said outlet volume;
- an outlet check body partially positioned within said outlet check spring;
- an outlet check seal fixedly interconnected to said outlet check body;
- wherein said valve body further comprises a inlet volume, wherein said inlet volume and said outlet volume are separated by a wall;
- a check body positioned within said fixed inlet volume, wherein said inlet check body is interconnected to said outlet check body, and wherein said inlet check body and said outlet check body are configured to selectively open a flow path between said inlet volume and said outlet volume or isolate said inlet volume from said outlet volume;
- and
- a drain spring that contacts a lower surface of said wall and a plunger.
A back flow prevention device, comprising:
- a valve body with a fixed inlet volume and a fixed outlet volume;
- an inlet check valve positioned within said inlet volume, said inlet check valve comprising:
- an inlet check spring positioned within said inlet volume;
- an inlet check body positioned within said inlet check spring;
- and
- an inlet check seal fixedly interconnected to said inlet check body;
- and
- an outlet check valve positioned within said outlet volume, said outlet check valve comprising:
- an outlet check spring positioned within said outlet volume;
- an outlet check body positioned within said outlet check spring;
- and
- an outlet check seal fixedly interconnected to said outlet check body;
- and
- wherein said inlet check body is inserted into and operably associated with said outlet check body.
Dependencies are inferred from the claim text.