Importance

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Abstract

A check valve for use in a section of a liquid flow line to control the intermittent flow of a liquid through the line, wherein the section of the line that is configured to received the valve has inlet and outlet ends with an opening through which liquid respectively enters or exits the section, includes a compression spring having upstream and downstream ends, wherein the spring is configured so as to allow the downstream end to press against the section outlet end. This check valve further includes a piston having bottom, top and outer side surfaces, with this piston having a cavity that extends from its top surface and is configured to allow the spring to sit and operated freely within the cavity with the spring's upstream end resting on the bottom surface of the cavity. This piston also has an opening in its side surface that connects the cavity and its outer side surface, and the piston's bottom surface has a raised sealing surface with an outer boundary that is configured so as to allow the boundary to enclose the opening in the section's inlet end. This check valve operates by having its piston's bottom surface press against the section inlet end due to the action of the spring so as to seal around the opening of the inlet end. The piston is made from an elastomeric material so as to give the piston the elastic properties necessary to allow its bottom surface to act as a seal for the inlet opening.

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First Claim