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Embodiments of a valve assembly and a plumbing system incorporating the same are provided herein. In some embodiments, a valve assembly for use with an enclosed environment includes a housing having an interior volume, an inlet disposed at a first end of the housing and fluidly coupled to an environ

Embodiments of a valve assembly and a plumbing system incorporating the same are provided herein. In some embodiments, a valve assembly for use with an enclosed environment includes a housing having an interior volume, an inlet disposed at a first end of the housing and fluidly coupled to an environment surrounding the housing, and an outlet disposed at a second end of the housing opposite the first end and fluidly coupled to the enclosed environment; a first valve having a first valve seat and a first sealing member at least partially extending through a first opening in the first valve seat in a closed position; and a second valve disposed beneath the first valve and having a second valve seat and a second sealing member at least partially extending through a second opening in the second valve seat in a closed position.

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1. A valve assembly for use with an enclosed environment, comprising: (a) a housing having an interior volume, an inlet disposed at a first end of the housing and fluidly coupled to an environment surrounding the housing, and an outlet disposed at a second end of the housing opposite the inlet first

1. A valve assembly for use with an enclosed environment, comprising: (a) a housing having an interior volume, an inlet disposed at a first end of the housing and fluidly coupled to an environment surrounding the housing, and an outlet disposed at a second end of the housing opposite the inlet first end, wherein said interior volume is divided into a first zone, a second zone, a third zone, wherein said first zone occupies a predetermined volume of said interior volume proximate said outlet, wherein said third zone occupies a predetermined volume of said interior volume proximate said inlet, wherein said second zone occupies a predetermined volume of said interior volume between said first zone and said third zone, wherein a first zone pressure exists in said first zone, wherein a second zone pressure exists in said second zone, and wherein a third zone pressure exists in said third zone;(b) a first valve inside said housing, comprising a first valve seat, wherein said first valve seat is disposed between said first zone and said second zone wherein said first valve seat has a first opening, wherein said first valve further comprises a first sealing member, wherein said first sealing member has an outer diameter greater than said first opening, wherein said first sealing member outer diameter is less than the inner diameter of said housing, wherein said first sealing member has a predetermined weight, and wherein said first sealing member can move inside said first zone and away from said first valve seat, wherein said first valve is in an open position when said second zone pressure is greater than said sealing member predetermined weight and said first zone pressure, and wherein said first valve is in a closed position when said second zone pressure is less than said sealing member predetermined weight and said first zone pressure;(c) a second valve inside said housing, comprising a second valve seat, wherein said second valve seat is disposed between said second zone and said third zone wherein said second valve seat has a second opening, wherein said second valve further comprises a second sealing member, wherein said second sealing member has an outer diameter greater than said second opening, wherein said second sealing member outer diameter is less than the inner diameter of said housing, wherein said second sealing member has a predetermined weight, and wherein said second sealing member can move inside said second zone and away from said second valve seat, wherein said second valve is in an open position when said third zone pressure is greater than said sealing member predetermined weight and said second zone pressure, and wherein said second valve is in a closed position when said third zone pressure is less than said sealing member predetermined weight and greater than said second zone pressure. 2. The valve assembly of claim 1, wherein: the first sealing member comprises a first upper hemispherical section, and first lower hemispherical section, a first neck section connecting the first upper and lower hemispherical sections, the first neck section having a first diameter less than a first opening diameter of the first opening of the first valve seat, a portion of each of the first upper and lower hemispherical sections being sized larger than the first opening diameter to form a seal when abutting against the first valve seat, andthe second sealing member comprises a second upper hemispherical section, a second lower hemispherical section, a second neck section connecting the second upper and lower hemispherical sections, the second neck section having a second diameter less than a second opening diameter of the second opening of the second valve seat, a portion of each of the second upper and lower hemispherical sections being sized larger than the second opening diameter to form a seal when abutting against the second valve seat. 3. The valve assembly of claim 1, wherein the first valve seat comprises a first flexible membrane coupled to and disposed radially within a first rigid ring that is coupled to an interior wall of the housing, and wherein the first opening is formed in the first flexible membrane. 4. The valve assembly of claim 1, wherein the second valve seat comprises a second flexible membrane coupled to and disposed radially within a second rigid ring that is coupled to an interior wall of the housing, and wherein the second opening is formed in the second flexible membrane. 5. The valve assembly of claim 1, wherein: the first sealing member comprises a first disc having a first diameter larger than a first opening diameter of the first opening to form a seal when the first disc rests on the first valve seat, andthe second sealing member comprises a second disc having a second diameter larger than a second opening diameter of the second opening to form a seal when the second disc rests on the second valve seat. 6. The valve assembly of claim 5, wherein each of the first and second sealing members further comprises: a plurality of alignment members extending from a peripheral edge of the first disc, wherein a circle circumscribing the plurality of alignment members has a diameter less than an inner diameter of the housing. 7. The valve assembly of claim 5, wherein at least one of the first and second sealing members further comprises a plurality of turbulators coupled to a lower surface of the first or second disc and configured to spin the first or second disc when air flows past the plurality of turbulators. 8. The valve assembly of claim 5, wherein at least one of the first and second sealing members further comprises: a central opening;a non-permeable sac coupled to the opening; anda weight configured to stretch the non-permeable sac downwards and press the first or second sealing member against the corresponding first or second valve seat. 9. The valve assembly of claim 8, wherein the weight is disposed within the non-permeable sac. 10. The valve assembly of claim 9, wherein the non-permeable sac includes a reduced diameter section having a diameter less than a width of the weight and a pocket disposed beneath the reduced diameter section, and wherein the pocket is configured to contain the weight after the weight is pushed beyond the reduced diameter section into the pocket. 11. The valve assembly of claim 8, wherein the weight is attached to a lowermost portion of the non-permeable sac. 12. The valve assembly of claim 1, wherein a first filter element disposed proximate to the inlet and having a first plurality of openings configured to prevent any object having a size larger than any one of the first plurality of openings from passing through the first filter element into the interior volume; and a second filter element disposed proximate to the outlet and having a second plurality of openings configured to prevent any object having a size larger than any one of the second plurality of openings from passing through the second filter element into the interior volume. 13. A valve assembly for use with an enclosed environment, comprising: a housing having an interior volume and an inlet disposed at a first end of the housing and fluidly coupled to an environment surrounding the housing, wherein the interior volume is defined by a wall and a ceiling of the housing, wherein the ceiling is disposed at a second end of the housing opposite the inlet first end;a pipe extending proximate the housing inlet coaxial with the housing into the housing interior volume and having a pipe end disposed above the housing inlet and below the ceiling of the housing, wherein the end of the pipe has an inlet opening fluidly coupled to the housing interior volume;a annular filter disposed below the second valve and above the housing inlet coupled between the interior wall of the housing and the pipe;a first valve having a first valve seat and a first sealing member disposed above the first valve seat, wherein the first valve seat includes a first seat outer ring coupled to the wall of the housing and a first seat inner ring coupled to an exterior wall of the pipe, wherein the first sealing member includes a first central opening through which the pipe extends, and wherein the first sealing member is moveable between an open position in which air is allowed to pass through a first space between the first seat outer and inner rings and a closed position in which air is prevented from moving through the first space;a second valve disposed beneath the first valve and having a second valve seat and a second sealing member disposed above the second valve seat, wherein the second valve seat includes a second seat outer ring coupled to the wall of the housing and a second seat inner ring coupled to the exterior wall of the pipe, wherein the second sealing member includes a second central opening through which the pipe extends, and wherein the second sealing member is moveable between an open position in which air is allowed to pass through a second space between the second seat outer and inner rings and a closed position in which air is prevented from moving through the second space;an annular filter element disposed at or proximate to the inlet and configured to prevent contaminants from passing through the annular filter element into the interior volume; and a second filter element disposed within the pipe at or proximate to the inlet opening and configured to prevent contaminants from passing through the second filter element into the pipe, wherein at least one of the first valve or second valve includes a flexible membrane section disposed in the first or second sealing member and a ring disposed atop the flexible membrane section, wherein the ring has a predetermined weight and is configured to bias the first or second sealing member towards the closed position, wherein the first valve seat is disposed in an upper portion of the interior volume and the second valve seat is disposed in a lower portion of the interior volume, and wherein the first and second valve seats divide the interior volume into a first zone, a second zone, and a third zone. 14. The valve assembly of claim 13, wherein said pipe extending proximate the housing is fluidly coupled to an enclosed environment piping system, comprising: a main pipeline; a trap coupled to the main pipeline; a conduit coupled to the main pipeline, wherein the conduit includes a first vertical portion coupled to the main pipeline at a first end, a second vertical portion parallel to the first vertical portion, and a u-shaped portion coupled to the first and second vertical portions at opposite ends of the u-shaped portion; and the valve assembly of claim 13 coupled to an end of the second vertical portion opposite the u-shaped portion. 15. A valve assembly to allow or stop air flow into an enclosed environment, comprising: a housing having an interior volume, defined by an interior wall, an inlet disposed at a first end of the housing and fluidly coupled to an environment surrounding the housing, and a ceiling end disposed opposite the inlet first end wherein a first valve is disposed in an upper portion of the interior volume and a second valve is disposed in a lower portion of the interior volume, andwherein said first valve and second valve divide the interior volume into a first zone, a second zone, and a third zone,wherein said first zone flow passage is above said second zone flow passage, wherein said second zone flow passage is above said third zone flow passage, wherein an upper flow passage pressure exists in said first zone flow passage, wherein a second zone flow passage pressure exists in said second zone flow passage, and wherein a third zone flow passage pressure exists in said third zone flow passage;a pipe extending proximate the housing inlet coaxial with the housing into the housing interior volume and having a pipe end disposed above the housing inlet first end and below the ceiling of the housing fluidly coupled to the housing interior volume;a filter element disposed below the second valve and above the housing inlet between the interior wall of the housing and the pipe;a first valve seat, wherein said first valve seat comprises an outer ring disposed in said upper portion of the interior volume to the interior wall, and wherein a first opening is formed on said first valve seat outer ring, wherein said first opening has an inner diameter and wherein a first valve seat further comprises an inner ring, wherein said first valve seat inner ring is disposed in said upper portion of the interior volume to the exterior wall of the pipe, and wherein a first opening is formed on said first valve seat inner ring, wherein said first opening has an outer diameter;a first sealing member, further comprising a main body, disposed above the first valve seat, and wherein a first central opening is formed on said first sealing member, wherein said opening has an inner diameter through which said pipe extends and said sealing member is moveable between an open position, when said second zone flow passage pressure beneath of the first sealing member is greater than said predetermined weight of said first sealing member and said first zone flow passage pressure in which air is allowed to flow through a first space between the first seat outer and inner rings, and wherein said first valve is in a closed position when said second zone flow passage pressure is equal to or less than said predetermined weight of said first sealing member and said first zone flow passage pressure in which the first sealing member seals when abutted against said first valve seat to prevent air from flowing through said first space between the first seat outer and inner rings; anda second valve seat, wherein said second valve seat comprises an outer ring disposed in said lower portion of the interior volume to the interior wall, and wherein a first opening is formed on said second valve seat outer ring, wherein said first opening has an inner diameter and wherein a second valve seat further comprises an inner ring, wherein said second valve seat inner ring is disposed in said lower portion of the interior volume to the exterior wall of the pipe, and wherein a first opening is formed on said second valve seat inner ring, wherein said first opening has an outer diameter;a second sealing member, further comprising a main body, disposed above the second valve seat, and wherein a first central opening is formed on said second sealing member, wherein said opening has an inner diameter through which said pipe extends and said second sealing member is moveable between an open position, when said third zone flow passage pressure beneath of the second sealing member is greater than said predetermined weight of said second sealing member and said second zone flow passage pressure in which air is allowed to flow through a second space between the first seat outer and inner rings, and wherein said second valve is in a closed position when said third zone flow passage pressure is equal to or less than said predetermined weight of said second sealing member and greater than second zone flow passage pressure in which the second sealing member seals when abutted against said first valve seat to prevent air from flowing through said second space between the second seat outer and inner rings. 16. The valve assembly of claim 15, wherein at least one of the first and second sealing members further comprises a plurality of turbulators coupled to a lower surface of the first or second sealing members and configured to spin the first or second sealing member when air flows past the plurality of turbulators. 17. The valve assembly of claim 15, wherein the flexible membrane section is an annular membrane having a circumference less than or equal to a circumference of the ring. 18. The valve assembly of claim 15, wherein the flexible membrane section is a plurality of compliant support elements arranged along a circumference around the pipe, and wherein the circumference is less than or equal to a circumference of the ring. 19. The valve assembly of claim 15, further comprising: a flexible membrane disposed within the first zone of the housing interior wall communicating with the enclosed environment and responsive to an increased positive pressure in first zone expanding upwards to temporarily increase the volume. 20. The valve assembly of claim 15, wherein the first filter element fluidly coupled to the housing interior wall and pipe exterior wall disposed at the housing inlet first end and having a first plurality of openings configured to prevent any object having a size larger than any one of the first plurality of openings from passing through the first filter element into the interior volume; and a second filter element disposed within the pipe and having a second plurality of openings configured to prevent any object having a size larger than any one of the second plurality of openings from passing through the second filter element into the interior volume.