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Check valves, Venturi devices and engines having such 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 check valves have an outlet conduit extending from the second port and/or the first seat has a first

Check valves, Venturi devices and engines having such 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 check valves have an outlet conduit extending from the second port and/or the first seat has a first annular seal bead and a second annular seal bead disposed radially inward of the first annular seal bead with 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. The outlet conduit defines an outlet passageway having a restrictor profile that is circular in a transverse profile, and the ribs decrease the flow area of the fluid flow path of the first port by about 10% to about 60%.

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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;a seal disk within the internal cavity, wherein the seal disk is tra

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;a seal disk within the internal cavity, wherein the seal disk is translatable between a closed position against the first seat and an open position against the second seat; andan outlet conduit extending from the second port, wherein the outlet conduit defines an outlet passageway and an outlet end, wherein the outlet passageway has a restrictor profile;wherein the restrictor profile has a first portion more proximate the second port and a second section more proximate the outlet end, wherein as viewed in a transverse cross-section both the first portion and the second portion are circular;wherein the first portion narrows according to a parabolic or hyperbolic function along a length of the first portion in the downstream direction. 2. The check valve of claim 1, wherein the second portion narrows according to a parabolic or hyperbolic function along a length of the second portion in the downstream direction. 3. The check valve of claim 1, 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, and the seal disk is deflectable between a generally planar closed position against the first seat and an arcuate position against the second seat. 4. 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;a seal disk within the internal cavity, wherein the seal disk is translatable between a closed position against the first seat and an open position against the second seat; andan outlet conduit extending from the second port, wherein the outlet conduit defines an outlet passageway and an outlet end, wherein the outlet passageway has a restrictor profile;wherein the restrictor profile has a first portion more proximate the second port and a second section more proximate the outlet end, wherein as viewed in a transverse cross-section both the first portion and the second portion are circular;wherein a length of the first portion compared to a length of the second portion is at least 1:3. 5. 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;a seal disk within the internal cavity, wherein the seal disk is translatable between a closed position against the first seat and an open position against the second seat; andan outlet conduit extending from the second port, wherein the outlet conduit defines an outlet passageway and an outlet end, wherein the outlet passageway has a restrictor profile;wherein the first seat comprises a first annular seal bead and a second annular seal bead disposed radially inward of the first annular seal bead, and a plurality of ribs extending between the first annular seal bead and the second annular seal bead within a fluid flow path of the first port. 6. The check valve of claim 5, wherein a portion of a surface of each of the plurality of ribs positioned facing 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 against the first seat. 7. The check valve of claim 5, wherein the plurality of ribs are spaced apart from each most proximate neighboring rib to decrease a flow area by about 10% to about 60% of an opening without any ribs present. 8. The check valve of claim 5, wherein the plurality of ribs comprises five or six connecting ribs extending between the first seal bead and the second seal bead. 9. The check valve of claim 8, wherein the plurality of ribs further comprises one or more partial ribs between neighboring connecting ribs. 10. 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;a seal disk within the internal cavity, wherein the seal disk is translatable between a closed position against the first seat and an open position against the second seat; andan outlet conduit extending from the second port, wherein the outlet conduit defines an outlet passageway and an outlet end, wherein the outlet passageway has a restrictor profile;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. 11. An engine system comprising: an engine having an intake manifold; anda 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;a seal disk within the internal cavity, wherein the seal disk is translatable between a closed position against the first seat and an open position against the second seat; andan outlet conduit extending from the second port, wherein the outlet conduit defines an outlet passageway and an outlet end, wherein the outlet passageway has a restrictor profile;wherein the outlet end of the outlet conduit is connected to the intake manifold for fluid communication therewith. 12. The engine system of claim 11, further comprising a device requiring vacuum; wherein the first port is connected in fluid communication with the device requiring vacuum. 13. 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; anda seal disk within the internal cavity, wherein the seal disk is translatable between a closed position against the first seat and an open position against the second seat;wherein the first seat comprises a first annular seal bead and a second annular seal bead disposed radially inward of the first annular seal bead, and a plurality of ribs extending between the first annular seal bead and the second annular seal bead within a fluid flow path of the first port;wherein the plurality of ribs are spaced apart from each most proximate neighboring rib to decrease a flow area by about 10% to about 60% of an opening without any ribs present;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, and the seal disk is deflectable between a generally planar closed position against the first seat and an arcuate position against the second seat. 14. The check valve of claim 13, wherein a portion of a surface of each of the plurality of ribs positioned facing 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 against the first seat. 15. The check valve of claim 13, wherein the plurality of ribs comprises five or six connecting ribs extending between the first seal bead and the second seal bead. 16. The check valve of claim 13, 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. 17. 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; anda seal disk within the internal cavity, wherein the seal disk is translatable between a closed position against the first seat and an open position against the second seat;wherein the first seat comprises a first annular seal bead and a second annular seal bead disposed radially inward of the first annular seal bead, and a plurality of ribs extending between the first annular seal bead and the second annular seal bead within a fluid flow path of the first port;wherein the plurality of ribs are spaced apart from each most proximate neighboring rib to decrease a flow area by about 10% to about 60% of an opening without any ribs present;wherein the plurality of ribs further comprises five or six connecting ribs extending between the first seal bead and the second seal bead and one or more partial ribs between neighboring connecting ribs. 18. A Venturi device comprising: a first check valve that comprises: 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;a seal disk within the internal cavity, wherein the seal disk is translatable between a closed position against the first seat and an open position against the second seat;wherein the first seat comprises a first annular seal bead and a second annular seal bead disposed radially inward of the first annular seal bead, and a plurality of ribs extending between the first annular seal bead and the second annular seal bead within a fluid flow path of the first port;wherein the plurality of ribs are spaced apart from each most proximate neighboring rib to decrease a flow area by about 10% to about 60% of an opening without any ribs present, and a portion of the surface of each of the plurality of ribs positioned facing 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 against the first seat;wherein the check valve controls fluid flow through a bypass port disposed downstream of and bypassing a Venturi gap and/or a second check valve controlling fluid flow through a Venturi gap. 19. The Venturi device of claim 18, 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. 20. An engine system comprising: a device requiring vacuum; anda Venturi device of claim 18 having a suction passageway in fluid communication with the Venturi gap;wherein the suction passageway is connected in fluid communication with the device requiring vacuum.