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A check valve includes a valve body, a pair of stoppers, a hinge pin, and one or more flappers. The valve body includes an inlet end, an outlet end, and an inner surface that defines a flow passage between the inlet end and the outlet end. The inner surface further defines a valve seat adjacent the

A check valve includes a valve body, a pair of stoppers, a hinge pin, and one or more flappers. The valve body includes an inlet end, an outlet end, and an inner surface that defines a flow passage between the inlet end and the outlet end. The inner surface further defines a valve seat adjacent the inlet end. The stoppers are integrally formed on the valve body inner surface, and each has a first end and a second end. The hinge pin is disposed within each hinge pin opening and extends across the flow passage. The flappers are disposed within the flow passage and are rotationally mounted on the hinge pin. Each of the one or more flappers is rotatable between a closed position, in which the flapper engages the valve seat, and a full-open position, in which the flapper engages the pair of stoppers.

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1. A check valve, comprising: a valve body including an inlet end, an outlet end, and an inner surface that defines a flow passage between the inlet end and the outlet end, the inner surface further defining a valve seat adjacent the inlet end;a pair of stoppers integrally formed on the valve body i

1. A check valve, comprising: a valve body including an inlet end, an outlet end, and an inner surface that defines a flow passage between the inlet end and the outlet end, the inner surface further defining a valve seat adjacent the inlet end;a pair of stoppers integrally formed on the valve body inner surface, each stopper having a first end and a second end, each first end disposed proximate the inlet end and including a hinge pin opening formed therein, each second end disposed downstream of the first end;a hinge pin disposed within each hinge pin opening and extending across the flow passage; andone or more flappers disposed within the flow passage and rotationally mounted on the hinge pin, each of the one or more flappers rotatable between a closed position, in which the flapper engages the valve seat, and a full-open position, in which the flapper engages the pair of stoppers,wherein each stopper is dimensioned such that: the first end extends radially inwardly from the inner surface a first distance;the second end extends radially inwardly from the inner surface a second distance;the first distance is greater than the second distance;the first end has a first width;the second end has a second width; andthe first width is greater than the second width. 2. The check valve of claim 1, wherein: the hinge pin openings extend through the valve body; andthe hinge pin is press fit into the hinge pin openings. 3. The check valve of claim 2, further comprising: a pair of adhesive pockets formed in the valve body, each adhesive pocket formed around one of the valve body hinge pin openings; andan adhesive disposed in each adhesive pocket and around a portion of the hinge pin. 4. The check valve of claim 1, further comprising: a pair of inserts, each insert disposed in a different one of the hinge pin openings. 5. The check valve of claim 4, wherein: at least one of the inserts has insert threads formed on an inner surface thereof; andthe hinge pin has pin threads formed on at least a portion of its outer surface, at least a portion of the pin threads engaging the insert threads. 6. The check valve of claim 4, wherein: each insert has insert threads formed on an inner surface thereof; andthe check valve further includes a pair of grub screws, each grub screw threaded into a different one of the inserts and securing the hinge pin in place. 7. The check valve of claim 4, wherein: the hinge pin includes a first end and a second end;the second end of the hinge pin is configured as a collet; andthe second end extends through and engages one of the inserts. 8. The check valve of claim 4, further comprising: one or more clips, each clip disposed around and engaging a different end of the hinge pin. 9. The check valve of claim 8, further comprising: one or more lock pins, each lock pin engaging a different one of the clips. 10. The check valve of claim 8, further comprising: an adhesive disposed within each of the hinge pin openings. 11. The check valve of claim 1, wherein: each flapper is snap fit onto the hinge pin; andthe portion of each flapper that is snap fit onto the hinge pin is at least partially metal insert molded. 12. The check valve of claim 1, further comprising: one or more gussets integrally formed on either the inner surface or outer surface of the valve body. 13. The check valve of claim 1, further comprising: a metal ring disposed proximate the outlet end of the valve body, the metal ring insert molded with the valve body. 14. The check valve of claim 1, wherein the valve body, the stoppers, and flappers are all formed of a fiber reinforced plastic. 15. A check valve, comprising: a valve body including an inlet end, an outlet end, and an inner surface that defines a flow passage between the inlet end and the outlet end, the inner surface further defining a valve seat adjacent the inlet end;a pair of stoppers integrally formed on the valve body inner surface, each stopper having a first end and a second end, each first end disposed proximate the inlet end and having a hinge pin opening formed therein that extends through the valve body, each second end disposed downstream of the first end,;a hinge pin press fit into each hinge pin opening, the hinge pin extending through each hinge pin opening and across the flow passage; anda pair of flappers disposed within the flow passage and rotationally mounted on the hinge pin, each flapper rotatable between a closed position, in which the flapper engages the valve seat, and a full-open position, in which the flapper engages the pair of stoppers,wherein: each stopper is dimensioned such that (i) the first end extends radially inwardly from the inner surface a first distance, (ii) the second end extends radially inwardly from the inner surface a second distance, and (iii) the first distance is greater than the second distance,the valve body, the stoppers, the hinge pin, and flappers are all formed of a fiber reinforced plastic, andeach flapper is snap fit onto the hinge pin. 16. The check valve of claim 15, further comprising: one or more reinforcement features integrally formed on the valve body. 17. A check valve, comprising: a valve body including an inlet end, an outlet end, and an inner surface that defines a flow passage between the inlet end and the outlet end, the inner surface further defining a valve seat adjacent the inlet end;a pair of stoppers integrally formed on the valve body inner surface, each stopper having a first end and a second end, each first end disposed proximate the inlet end and including a hinge pin opening formed therein, each second end disposed downstream of the first end;a pair of inserts, each insert disposed in a different one of the hinge pin openings;an adhesive disposed within each of the hinge pin openings;a hinge pin disposed within each hinge pin opening and extending across the flow passage;one or more clips, each clip disposed around and engaging a different end of the hinge pin; andone or more flappers disposed within the flow passage and rotationally mounted on the hinge pin, each of the one or more flappers rotatable between a closed position, in which the flapper engages the valve seat, and a full-open position, in which the flapper engages the pair of stoppers.