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A check valve is provided that includes a valve body, a stop bar, a flapper, and a protrusion. The valve body has a flow channel extending therethrough, a first stop support, and a second stop support. The first and second stop supports extend axially from the valve body. The stop bar is coupled to

A check valve is provided that includes a valve body, a stop bar, a flapper, and a protrusion. The valve body has a flow channel extending therethrough, a first stop support, and a second stop support. The first and second stop supports extend axially from the valve body. The stop bar is coupled to and extends between the first and the second stop supports. The flapper is rotationally mounted to the valve body and comprises a first material. The protrusion is integrally molded with the flapper and extends axially therefrom. The protrusion comprises a second material that is non-metallic and different than the first material. The flapper is moveable between a closed position, in which the flapper at least substantially seals the flow channel, and a fully-open position, in which the protrusion contacts the stop bar and the flapper unseals the flow channel.

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We claim: 1. A check valve for disposal in a duct, the check valve comprising: a valve body having a flow channel extending therethrough, a first stop support, and a second stop support, the first and second stop supports extending axially from the valve body; a stop bar coupled to and extending be

We claim: 1. A check valve for disposal in a duct, the check valve comprising: a valve body having a flow channel extending therethrough, a first stop support, and a second stop support, the first and second stop supports extending axially from the valve body; a stop bar coupled to and extending between the first and the second stop supports; a flapper rotationally mounted to the valve body, the flapper comprising a first material and including an upstream side, a downstream side, a mount hole, and a depression, the mount hole extending between the upstream side and the downstream side, and the depression formed in the downstream side in communication with the mount hole; and a protrusion injection molded into the flapper and extending axially therefrom, the protrusion comprising a second material that is non-metallic and different than the first material and including a mount portion, a connector portion, and a contact portion, the mount portion disposed on the upstream side of the flapper, the connector portion extending through the mount hole, and the contact portion disposed within and extending away from the depression, wherein the flapper is moveable between a closed position, in which the flapper at least substantially seals the flow channel, and a fully-open position, in which the contact portion of the protrusion contacts the stop bar and the flapper unseals the flow channel. 2. The check valve of claim 1, wherein the second material comprises an elastomeric material. 3. The check valve of claim 1, wherein the elastomeric material comprises fluorosilicone. 4. The check valve of claim 1, wherein the second material comprises an engineered composite material. 5. The check valve of claim 4, wherein the engineered composite material comprises a plastic. 6. The check valve of claim 1, wherein the stop bar comprises a metal. 7. The check valve of claim 1, wherein the first material comprises a metallic material. 8. A check valve for disposal in a duct, the check valve comprising: a valve body having a flow channel extending therethrough, a first stop support, and a second stop support, the first and second stop supports extending axially from the valve body; a metallic stop bar coupled to and extending between the first and the second stop supports; a metallic flapper rotationally mounted to the valve body and including an upstream side, a downstream side, a mount hole, and a depression, the mount hole extending between the upstream side and the downstream side, and the depression formed in the downstream side in communication with the mount hole; and a non-metallic protrusion injection molded into the metallic flapper and extending axially therefrom and including a mount portion, a connector portion, and a contact portion, the mount portion disposed on the upstream side of the metallic flapper, the connector portion extending through the mount hole, and the contact portion disposed within and extending away from the depression, wherein the metallic flapper is moveable between a closed position, in which the metallic flapper at least substantially seals the flow channel, and a fully-open position, in which the contact portion of the non-metallic protrusion contacts the stop bar and the metallic flapper unseals the flow channel.