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A flapper valve assembly is provided for venting pressure in a tank. The flapper valve assembly includes a float assembly that is configured to be disposed within a valve housing. The float assembly may have a plurality of guide supports that extend from an end portion of the float assembly. A flapp

A flapper valve assembly is provided for venting pressure in a tank. The flapper valve assembly includes a float assembly that is configured to be disposed within a valve housing. The float assembly may have a plurality of guide supports that extend from an end portion of the float assembly. A flapper member is movably supported on the float assembly. The flapper member may include a plurality of guide legs that correspond with the guide supports of the float assembly to maintain proper alignment of the flapper member relative to the float assembly.

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1. A flapper valve assembly for venting pressure in a tank, the flapper valve assembly comprising: a float assembly configured to be disposed within a valve housing, the float assembly having a plurality of guide supports that extend from an end portion of the float assembly; anda flapper member fre

1. A flapper valve assembly for venting pressure in a tank, the flapper valve assembly comprising: a float assembly configured to be disposed within a valve housing, the float assembly having a plurality of guide supports that extend from an end portion of the float assembly; anda flapper member freely pivotable on the float assembly, wherein the flapper member includes a plurality of guide legs that correspond with the plurality of guide supports of the float assembly to maintain proper alignment of the flapper member relative to the float assembly, andwherein at least two of the plurality of guide legs have respective projections that extend radially outward beyond opposite sides of at least one of the plurality of guide supports and then at least partially overlap an outwardly facing surface of the at least one of the plurality of guide supports, andwherein another at least two of the plurality of guide legs include alignment legs that abut inwardly facing sides of at least two of the plurality of guide supports. 2. A flapper valve assembly comprising: a float assembly configured to be disposed within a valve housing, the float assembly including a plurality of vertical supports that extend from an end portion of the float assembly, with one of the vertical supports including a guide support;a flapper member freely pivotable on the float assembly, wherein the flapper member includes a plurality of guide legs that are coupled to the guide support of the float assembly to maintain proper alignment of the flapper member relative to the float assembly;wherein at least two of the guide legs have respective projections that extend outward along opposite sides of the guide support, and which at least partially extend along and selectively contact an outwardly facing surface of the guide support; andwherein the flapper member includes a plurality of alignment legs that abut respective inwardly facing sides of respective ones of the vertical supports. 3. The flapper valve assembly of claim 1, wherein the float assembly further includes a guide ring that forms a cage with the vertical supports of the float assembly to restrict a range of motion of the flapper member. 4. The flapper valve assembly of claim 1, wherein the guide support of the float assembly further includes a ledge located on an intermediate portion to contact the guide legs of the flapper member and restrict a range of motion of the flapper member. 5. The flapper valve assembly of claim 1, wherein at least one of the guide legs of the flapper member defines a hook shaped portion that surrounds at least part of the guide support of the float assembly. 6. The flapper valve assembly of claim 5, wherein the alignment legs restrict rotational movement of the flapper member relative to the float assembly. 7. The flapper valve assembly of claim 1, wherein at least two of the guide legs of the flapper member define respective hook portions that extend along opposite sides of the guide support of the float assembly. 8. The flapper valve assembly of claim 1, further including a rocking mechanism provided between the float body and the flapper member which is configured to allow the flapper member to freely pivot in any direction on the float assembly. 9. The flapper valve assembly of claim 8, wherein the rocking mechanism includes a protrusion that extends from the end portion of the float body and is loosely received in a recess formed in an underside of the flapper member, and wherein the protrusion and the recess are complimentary in configuration to each other. 10. The flapper valve assembly of claim 9, wherein the float assembly further includes a guide ring that forms a cage with the vertical supports and the guide support, and wherein the protrusion is coaxially aligned with the guide ring. 11. The flapper valve assembly of claim 1, wherein a seal is supported on the flapper member and the seal is made from an elastomer composition that includes polytetrafluoroethylene (PTFE). 12. The flapper valve assembly of claim 11, wherein the polytetrafluoroethylene (PTFE) additive constitutes approximately 5% of the elastomer composition. 13. The flapper valve assembly of claim 1, wherein a seal is supported on the flapper member and the seal includes resilient protrusions that are received within holes formed in a perimeter of the flapper member for securing the seal to the flapper member. 14. A flapper valve assembly comprising: a float body including a plurality of vertical supports and a guide ring that form a cage which extends from an end of the float body, with one of the vertical supports including a guide support;a flapper member freely pivotable within the cage of the float body, the flapper member including a plurality of guide legs that are coupled to the guide support of the float assembly to maintain proper alignment of the flapper member relative to the float body; anda rocking mechanism including a protrusion provided on the end of the float body and the protrusion is coaxially aligned with the guide ring, and wherein the rocking mechanism includes a recess formed in an underside of the flapper member which loosely receives the protrusion to pivotally support the flapper member on the float body, and wherein the protrusion and the recess are configured complementary in configuration to each other;wherein the guide support includes a first side facing the protrusion and a second side opposing the first side such that the second side faces away from the protrusion;wherein at least one of the guide legs of the flapper member defines a hook shaped portion that extends transverse to the at least one of the guide legs such that the hook shaped portion at least partially surrounds the second side of the guide support to couple the flapper member to the guide support. 15. The flapper valve assembly of claim 14, wherein the guide support of the float body further includes a ledge located on an intermediate portion to contact the guide legs of the flapper member and restrict a range of motion of the flapper member. 16. The flapper valve assembly of claim 14, wherein each of the guide legs of the flapper member defines the hook shaped portion, and the hook shaped portion of each of the guide legs at least partially surround the second side of the guide support. 17. The flapper valve assembly of claim 16, wherein the flapper member further includes at least one alignment leg that abuts against at least one of the vertical supports of the float body to restrict rotational movement of the flapper member relative to the float body. 18. The flapper valve assembly of claim 14, wherein the guide support includes opposing sides disposed adjacent to the first and second sides of the guide support, with the opposing sides of the guide support disposed between the guide legs, and wherein at least two of the guide legs of the flapper member each define respective hook shaped portions that extend toward each other to at least partially surround the second side of the guide support of the float body. 19. The flapper valve assembly of claim 14, wherein a seal is supported on the flapper member and the seal is made from an elastomer composition that includes polytetrafluoroethylene (PTFE). 20. The flapper valve assembly of claim 19, wherein the polytetrafluoroethylene (PTFE) additive constitutes approximately 5% of the elastomer composition. 21. The flapper valve assembly of claim 14, wherein a seal is supported on the flapper member and the seal includes resilient protrusions that are received within holes formed in the flapper member for securing the seal to the flapper member.