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Check valves, Venturi devices and engines that include the check valves are disclosed. The check valves define an internal cavity having a first port and a second port, a first seat and a second seat, and a translatable seal disk. The first seat is proximate the first port and has a first annular se

Check valves, Venturi devices and engines that include the check valves are disclosed. The check valves define an internal cavity having a first port and a second port, a first seat and a second seat, and a translatable seal disk. The first seat is proximate the first port and has a first annular seal bead, and a second annular seal bead radially inward from the first annular seal bead. The seal disk has a first sealing portion seatable against the first annular seal bead and a second sealing portion seatable against the second annular seal bead (both of a first thickness), an intermediate portion between the first and second sealing portions of a second thickness, and a lip portion defining the outer periphery of the seal disk of a third thickness. The second thickness is greater than the first thickness, and the third thickness is less than the first thickness.

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1. A check valve comprising: a housing defining an internal cavity having a first port and a second port both in fluid communication therewith and having a first seat and a second seat, the first seat being proximate the first port and comprising a first annular seal bead and a second annular seal b

1. A check valve comprising: a housing defining an internal cavity having a first port and a second port both in fluid communication therewith and having a first seat and a second seat, the first seat being proximate the first port and comprising a first annular seal bead and a second annular seal bead disposed radially inward of the first annular seal bead; anda seal disk within the internal cavity, the seal disk comprising a first sealing portion seatable against the first annular seal bead and a second sealing portion seatable against the second annular seal bead, each having a first thickness, an intermediate portion between the first sealing portion and the second sealing portion that has a second thickness that is greater than the first thickness, and a lip portion defining the outer periphery of the seal disk and having a third thickness that is less than the first thickness, wherein the seal disk is translatable between a closed position against the first seat and an open position against the second seat. 2. The check valve of claim 1, wherein the first seat further comprises a plurality of ribs extending between the first annular seal bead and the second annular seal bead within the fluid flow path of the first port. 3. The check valve of claim 2, wherein the portion of the surface of each of the plurality of ribs positioned facing the intermediate portion of the seal disk is recessed a depth that forms a generally uniform gap between the seal disk and each of the plurality of ribs between the first annular seal bead and the second annular seal bead when the seal disk is seated thereagainst in an initial state. 4. The check valve of claim 2, wherein the plurality of ribs are spaced apart from each most proximate neighboring rib to decrease the flow area by about 10% to about 60% of the opening without any ribs present. 5. The check valve of claim 2, wherein the plurality of ribs comprises five or six connecting ribs extending between the first seal bead and the second seal bead. 6. The check valve of claim 5, wherein the plurality of ribs further comprises one or more partial ribs between neighboring connecting ribs. 7. The check valve of claim 6, wherein, when there are a plurality of partial ribs between neighboring connecting ribs, the partial ribs have the same length or different lengths. 8. The check valve of claim 1, wherein the first seat further comprises a plurality of ribs extending from the first annular seal bead in an orientation transverse to a longitudinal axis to define a grill of ribs, wherein at least one rib is a connecting rib between the first annular seal bead and the second annular seal bead. 9. The check valve of claim 1, wherein the seal disk is deflectable between a generally planar closed position against the first seat and an arcuate position against the second seat. 10. The check valve of claim 9, wherein the second seat defines a support structure comprising a plurality of fingers extending into the internal cavity circumferentially spaced apart about the second port. 11. The check valve of claim 1, wherein the housing includes a pin extending into the internal cavity, the seal disk includes a bore therethrough, and the pin of the housing is received in the bore of the seal disk for translation of the seal disk along the pin. 12. The check valve of claim 1 wherein the second port includes a discharge passageway having a restrictor profile. 13. The check valve of claim 12, wherein the second port is in fluid communication with an intake manifold of an internal combustion engine. 14. A Venturi device comprising: a check valve according to claim 1 controlling fluid flow through a bypass port disposed downstream of and bypassing a Venturi gap and/or a check valve according to claim 1 controlling fluid flow through a Venturi gap. 15. The Venturi device of claim 14, wherein the first seat further comprises a plurality of ribs extending between the first annular seal bead and the second annular seal bead within the fluid flow path of the first port. 16. The Venturi device of claim 15, wherein the plurality of ribs comprises five or six connecting ribs extending between the first seal bead and the second. 17. The Venturi device of claim 15, wherein the plurality of ribs further comprises one or more partial ribs between neighboring connecting ribs. 18. The Venturi device of claim 14, wherein the first seat further comprises a plurality of ribs extending from the first annular seal bead in an orientation transverse to a longitudinal axis to define a grill of ribs, wherein at least one rib is a connecting rib between the first annular seal bead and the second annular seal bead. 19. The Venturi device of claim 14, wherein the seal disk is deflectable between a generally planar closed position against the first seat and an arcuate position against the second seat. 20. The Venturi device of claim 19, wherein the second seat defines a support structure comprising a plurality of fingers extending into the internal cavity circumferentially spaced apart about the second port. 21. The Venturi device of claim 14, further comprising a sound attenuating member disposed in the fluid path between the Venturi gap and the bypass port and/or a sound attenuating member connected thereto upstream of an inlet port into the bypass check valve. 22. An engine system comprising the Venturi device of claim 14 connected to a device requiring vacuum.