Check valve with secondary backflow seal
AssigneeCareFusion 303, Inc.
InventorsShervin MALEKI, Eugene MASON, Raymond P. FEITH
Life of this patent
Estimating the term…
Abstract
Check valve are disclosed having a primary seal and a secondary seal, where the primary and secondary seals resist movement of a fluid through the check valve, and the secondary seal can provide a backup seal in an instance where the check valve does not function as intended. The primary and secondary seals can be formed by first and second sealing ridges, respectively, and a valve body can be positioned within the check valve, between a valve support, the first sealing ridge, and a second sealing ridge. The valve body is configured to move relative to the first and second sealing ridges, and can have a position wherein a portion of the valve body is engaged against any of the first and second sealing ridges.
Claims22
A check valve comprising:
- a housing comprising an inner cavity, a first port, and a second port, wherein an upstream fluid passageway extends through the first port to the inner cavity, and a downstream fluid passageway extends through the second port to the inner cavity;
- a first sealing ridge, extending from the housing in a first direction into the inner cavity, and comprising a perimeter that extends around the first port;
- a second sealing ridge, extending from the housing in a first direction into the inner cavity, and comprising a perimeter that extends around the upstream fluid passageway such that the first seal ridge is between the first port and the second seal ridge;
- a valve support comprising a valve support surface;
- and
- a valve body positioned within the inner cavity, the valve body comprising a first portion that is moveable in the first direction away from the first sealing ridge, and in a second direction toward the first sealing ridge, a second portion that is moveable in the first direction away from the second sealing ridge, and in the second direction toward the second sealing ridge, and third portion is engaged against the valve support surface.
A check valve comprising:
- a housing comprising an inner cavity, a first port, and a second port, wherein an upstream fluid passageway extends through the first port to the inner cavity, and a downstream fluid passageway extends through the second port to the inner cavity;
- a first sealing ridge, extending from the housing in a first direction into the inner cavity, and comprising a perimeter that extends around the first port;
- a second sealing ridge, extending from the housing in the first direction into the inner cavity, and comprising a perimeter that extends around the upstream fluid passageway such that the first seal ridge is between the first port and the second seal ridge;
- and
- a valve body positioned within the inner cavity and comprising a first closed position, wherein a first portion of the valve body is engaged against the first sealing ridge, and a second portion of the valve body is spaced apart from the second sealing ridge in the first direction, an open position, wherein the first and second portions of the valve body are spaced apart from the first and second sealing ridges in the first direction, respectively, and a second closed position, wherein at least a portion of the first portion of the valve body is engaged against the first sealing ridge and the second portion of the valve body is engaged against the second sealing ridge.
A method of controlling flow comprising:
- providing a check valve defining an inner cavity with a fluid passageway extending therethrough, a first sealing ridge extending into the inner cavity in a first direction, and a second sealing ridge extending into the inner cavity in the first direction;
- and
- providing a valve body within the inner cavity in a first closed position such that a first portion of the valve body is engaged against the first sealing ridge to resist movement of a fluid between upstream and downstream portions of the fluid passageway, and a second portion of valve body is spaced apart from the second sealing ridge in the first direction;
- wherein the valve body is moveable to a second closed position such that at least a portion of the first portion of the valve body is engaged against the first sealing ridge and the second portion of the valve body moves in a second direction toward and engages the second sealing ridge.
Dependencies are inferred from the claim text.