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Check valve units having one or more sound attenuating members are disclosed. A check valve unit includes a housing defining an inlet port, an outlet port, and a chamber in fluid communication therewith thereby defining a flow path from the inlet port through the chamber to the outlet port. The cham

Check valve units having one or more sound attenuating members are disclosed. A check valve unit includes a housing defining an inlet port, an outlet port, and a chamber in fluid communication therewith thereby defining a flow path from the inlet port through the chamber to the outlet port. The chamber includes first and second valve seats and has a sealing member disposed therein that is moveable from a position seated on the first valve seat to a position seated on the second valve seat. A sound attenuating member is disposed in the flow path downstream of the chamber, within the chamber, or both. In another embodiment, the check valve unit includes a Venturi portion in fluid communication with the chamber. The Venturi portion has a fluid junction with the flow path downstream of the chamber or forms the discharge section of the Venturi portion thereby defining the outlet port.

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1. A check valve unit comprising: a housing defining an inlet port, an outlet port, and a chamber in fluid communication with the inlet port and the outlet port thereby defining a flow path from the inlet port through the chamber to the outlet port, wherein the chamber is defined between a first val

1. A check valve unit comprising: a housing defining an inlet port, an outlet port, and a chamber in fluid communication with the inlet port and the outlet port thereby defining a flow path from the inlet port through the chamber to the outlet port, wherein the chamber is defined between a first valve seat and a second valve seat;a sealing disc disposed within the chamber and moveable within the chamber between a position seated on the first valve seat to a position seated on the second valve seat only in response to a pressure difference across the sealing disc itself; anda sound attenuating member disposed in the flow path downstream of the chamber, disposed within the chamber, or both. 2. The check valve unit of claim 1, wherein the sound attenuating member includes a porous material that attenuates noise pressure wave by interference. 3. The check valve unit of claim 1, wherein the sound attenuating member is heat resistant to temperatures in an internal combustion engine. 4. The check valve unit of claim 1, wherein the sound attenuating member is a continuous plug of porous material. 5. The check valve unit of claim 1, wherein the sound attenuating member has one or more bore holes passing therethrough that are generally aligned with the direction of the flow in the flow path. 6. The check valve unit of claim 1, wherein a first sound attenuating member is disposed in the flow path proximate the inlet port and a second sound attenuating member is disposed in the flow path proximate the outlet port. 7. The check valve unit of claim 1, wherein a first sound attenuating member is disposed in the chamber and forms either the first valve seat or the second valve seat and a second sound attenuating member is disposed in the flow path proximate the outlet port. 8. A check valve unit comprising: a housing defining an inlet port, an outlet port, and a chamber in fluid communication with the inlet port and the outlet port thereby defining a flow path from the inlet port through the chamber to the outlet port, wherein the chamber includes a first valve seat and a second valve seat;a sealing member disposed in the chamber and moveable from a position seated on the first valve seat to a position seated on the second valve seat;a sound attenuating member disposed in the flow path downstream of the chamber, disposed within the chamber, or both; anda Venturi portion having a fluid junction with the outlet port for fluid communication therewith. 9. The check valve unit of claim 1, wherein a first sound attenuating member is disposed in the flow path proximate the outlet port. 10. The check valve unit of claim 9, wherein a second sound attenuating member is disposed in the flow path proximate the inlet port. 11. The check valve unit of claim 9, wherein a second sound attenuating member is disposed in the chamber. 12. A check valve unit comprising: a housing defining an inlet port, an outlet port, and a chamber in fluid communication with the inlet port and the outlet port thereby defining a flow path from the inlet port through the chamber to the outlet port, wherein the chamber includes a first valve seat and a second valve seat;a sealing member disposed in the chamber and moveable from a position seated on the first valve seat to a position seated on the second valve seat;a sound attenuating member disposed in the flow path downstream of the chamber, disposed within the chamber, or both; anda Venturi portion in fluid communication with the chamber, wherein a discharge section of the Venturi portion defines the outlet port of the chamber, and the sound attenuating member is disposed in the discharge section. 13. The check valve unit of claim 12, wherein the housing further defines: a second chamber having a second inlet port and a second outlet port in fluid communication therewith thereby defining a flow path from the inlet port through the chamber to the outlet port, wherein the second chamber includes a first valve seat and a second valve seat;a sealing member disposed in the second chamber that is moveable from a position seated on the first valve seat to a position seated on the second valve seat; andwherein the outlet port of the second chamber has a fluid junction with the discharge section of the Venturi portion downstream of the sound attenuating member. 14. The check valve unit of claim 12, wherein the sound attenuating member includes a porous material that attenuates noise pressure wave by interference. 15. The check valve unit of claim 12, wherein the sound attenuating member is heat resistant to temperatures in an internal combustion engine. 16. The check valve unit of claim 12, wherein the sound attenuating member is a continuous plug of porous material. 17. The check valve unit of claim 12, wherein the sound attenuating member has one or more bore holes passing therethrough that are generally aligned with the direction of the flow in the flow path. 18. The check valve unit of claim 12, wherein the discharge section includes a canister to house the sound attenuating member, wherein the canister comprises a first canister portion as part of the discharge section of the Venturi portion that defines a seat for the sound attenuating member and a second canister portion that is mated to the first canister portion to enclose the sound attenuating member in a first chamber of the canister. 19. The check valve unit of claim 18, wherein the canister is a dual chambered canister that forms a second chamber surrounding at least a portion of the discharge section of the Venturi portion upstream from the first chamber. 20. The check valve unit of claim 19, wherein the discharge section includes a collar extending outward therefrom at a position upstream from the first canister portion, wherein the collar is mated with the second canister portion thereby defining the second chamber. 21. A check valve unit comprising: a housing defining an inlet port, an outlet port, and a chamber in fluid communication with the inlet port and the outlet port thereby defining a flow path from the inlet port through the chamber to the outlet port, wherein the chamber is defined between a first valve seat and a second valve seat;a sealing disc disposed within the chamber and moveable within the chamber between a position seated on the first valve seat to a position seated on the second valve seat, wherein the sealing member moves to an open position in response to fluid flow from the inlet port to the outlet port; anda sound attenuating member disposed in the flow path downstream of the chamber, disposed within the chamber, or both;wherein a first sound attenuating member is disposed in the flow path proximate the inlet port or the first sound attenuating member is disposed in the chamber and forms either the first valve seat or the second valve seat, and a second sound attenuating member is disposed in the flow path proximate the outlet port.