# US 10,767,774 B2 · Dual check valve > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,767,774 B2 - Document ID: US10767774B2 - Status: Granted - Kind: B2 - Application number: 16/138,799 - Filed: 2018-09-21 - Published: 2019-03-28 - Granted: 2020-09-08 - Earliest claimed: 2017-09-22 - Assignees: CareFusion 303, Inc. - Applicants: CareFusion 303, Inc. - Inventors: Raymond Feith; George Mansour - Web page: https://patentgrep.com/patent/US10767774B2 ## CPC - F16K 15/148: {the closure elements being fixed in their centre} - A61M 39/24: Check- or non-return valves - A61M 2039/242: {designed to open when a predetermined pressure or flow rate has been reached, e.g. check valve actuated by fluid} - A61M 2039/2493: {Check valve with complex design, e.g. several inlets and outlets and several check valves in one body} - F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)} - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} ## Abstract A dual check valve includes an upper housing, an intermediate housing, and a lower housing, and a first valve seat. The intermediate housing is coupled to the upper housing to define a first cavity, and includes a second valve seat. The lower housing is coupled to the intermediate housing to define a second cavity. A first disk is mounted in the first cavity and configured to selectively contact the first valve seat. A second disk is mounted in the second cavity and configured to selectively contact the second valve seat. When the dual check valve is in an open state, the first disk deflects away from the first valve seat to create a first gap, and the second disk deflects away from the second valve seat to create a second. The first gap is smaller than the second gap. ## Claims ### Claim 1 A dual check valve, comprising: an upper housing defining an inlet port of the check valve, and including a first valve seat having a first diameter; an intermediate housing coupled to the upper housing to define a first cavity, and including a second valve seat having a second diameter, wherein the first diameter is larger than the second diameter; a lower housing defining an outlet of the check valve, and coupled to the intermediate housing to define a second cavity; a first disk mounted in the first cavity and configured to selectively contact the first valve seat; and a second disk mounted in the second cavity and configured to selectively contact the second valve seat, wherein when the dual check valve is in an open state, the first disk deflects away from the first valve seat to create a first gap between an upper surface of the first disk and the first valve seat, and the second disk deflects away from the second valve seat to create a second gap between an upper surface of the second disk and the second valve seat, the first gap being smaller than the second gap. ### Claim 2 (depends on 1) The dual check valve of claim 1, wherein: the first valve seat surrounds an opening of the inlet port in the first cavity; and the second valve seat surrounds an opening of an outlet port defined in the intermediate housing. ### Claim 3 (depends on 1) The dual check valve of claim 1, wherein a thickness of the first disk is equal to or greater than a thickness of the second disk. ### Claim 4 (depends on 1) The dual check valve of claim 1, wherein a diameter of the first disk is equal to or greater than a diameter of the second disk. ### Claim 5 (depends on 1) The dual check valve of claim 1, wherein a diameter of the first disk is less than a diameter of the second disk. ### Claim 6 (depends on 1) The dual check valve of claim 1, wherein a durometer value of the first disk differs from a durometer value of the second disk. ### Claim 7 (depends on 1) The dual check valve of claim 1, wherein when (1) a first pressure applied to the upper surface of the first disk is equal to or less than a second pressure applied to a lower surface of the first disk, and (2) a third pressure applied to the upper surface of the second disk is equal to or less than a fourth pressure applied to a lower surface of the second disk, the dual check valve is in a closed state. ### Claim 8 (depends on 1) The dual check valve of claim 1, wherein when (1) a first pressure applied to the upper surface of the first disk is greater than a second pressure applied to a lower surface of the first disk and (2) a third pressure applied to the upper surface of the second disk is greater than a fourth pressure applied to a lower surface of the second disk, the dual check valve is in the open state. ### Claim 9 (depends on 1) The dual check valve of claim 1, wherein each of the first and second valves comprise an outer perimeter, and wherein the entire perimeter of the first valve is moveable relative to the upper housing, and the entire perimeter of the second valve is moveable relative to the intermediate housing. ### Claim 10 A dual check valve system, comprising: a housing comprising an upper section including a first radial protrusion, an intermediate section including a second radial protrusion, and a lower section, wherein: the upper and intermediate sections define a first cavity; and the intermediate and lower sections define a second cavity; a first check valve comprising a first disk configured to engage the first radial protrusion and a second radial protrusion; and a second check valve comprising a second disk configured to engage the first radial protrusion, wherein a diameter of the first radial protrusion is larger than a diameter of the second radial protrusion. ### Claim 11 (depends on 10) The dual check valve system of claim 10, wherein: when a first pressure is applied to the first disk, the first disk is disengaged from the first radial protrusion and a first gap is created between the first disk and the first radial protrusion; and when a second pressure is applied to the second disk, the second disk is disengaged from the second radial protrusion and a second gap is created between the second disk and the second protrusion, the first gap being smaller than the second gap. ### Claim 12 (depends on 11) The dual check valve system of claim 11, wherein: the first check valve further comprises a first outlet port and a first post, the first disk being supported by the first post to engage the first radial protrusion; and the second check valve further comprises a second outlet port and second post, the second disk being supported by the second post to engage the second radial protrusion. ### Claim 13 (depends on 12) The dual check valve system of claim 12, wherein a top surface of the first disk engages the first protrusion, and a bottom surface of the first disk is in contact with a tip of the first post, and wherein a top surface of the second disk engages the second protrusion, and a bottom surface of the second disk is in contact with a tip of the second post. ### Claim 14 (depends on 12) The dual check valve system of claim 12, wherein the first post supports the first disk a diameter of the first radial protrusion is equal or larger than a diameter of the second radial protrusion. ### Claim 15 (depends on 10) The dual check valve system of claim 10, wherein a thickness of the first disk is equal to or greater than a thickness of the second disk. ### Claim 16 (depends on 10) The dual check valve of claim 10, wherein a diameter of the first disk is equal to or greater than a diameter of the second disk. ### Claim 17 (depends on 10) The dual check valve system of claim 10, wherein a diameter of the first disk is less than a diameter of the second disk. ### Claim 18 (depends on 10) The dual check valve system of claim 10, wherein a durometer value of the first disk differs from a durometer value of the second disk. ### Claim 19 A dual check valve, comprising: an upper housing defining an inlet of the check valve, and including a first radial protrusion; an intermediate housing coupled to the upper housing, and including a second radial protrusion, the intermediate housing defining a first outlet of the check valve; a lower housing coupled to the intermediate housing, and defining a second outlet of the check valve, a first cavity interposed between and defined by the upper and intermediate housings for fluidly connecting the inlet and the first outlet; a second cavity interposed between and defined by the intermediate and lower housings for fluidly connecting the first and second outlets; a first disk mounted in the first cavity to selectively permit fluid flow in a first direction, and prevent fluid backflow in a second direction opposite to the first direction; and a second disk mounted in the second cavity to selectively permit fluid flow in the first direction, and prevent fluid backflow in the second direction opposite to the first direction, wherein a thickness of the first disk is greater than a thickness of the second disk, such that the second disk is more flexible than the first disk; wherein when a pressure is applied to place the dual check valve in an open state, a stroke length between the second radial protrusion and the top surface of the second disk is greater than a stroke length between the first radial protrusion and the top surface of the first disk. ### Claim 20 (depends on 19) The dual check valve of claim 19, wherein a diameter of the first radial protrusion is equal to or larger than a diameter of the second radial protrusion.