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An apparatus to allow or stop a flow into a piping system or an enclosed environment comprises a housing having an upper flow passage, a gasket, and a lower flow passage, wherein said gasket is between said upper flow passage and said lower flow passage, wherein said gasket has an inner diameter les

An apparatus to allow or stop a flow into a piping system or an enclosed environment comprises a housing having an upper flow passage, a gasket, and a lower flow passage, wherein said gasket is between said upper flow passage and said lower flow passage, wherein said gasket has an inner diameter less than an inner diameter of said upper flow passage; a rotary valve inside said housing, wherein said rotary valve further comprises a main body and two guides affixed to said main body in opposition to each other, wherein said main body of said rotary valve is configured to be between said inner diameter of said gasket and said inner diameter of said upper flow passage, and wherein said rotary valve can move inside said upper flow passage and above said gasket; and two guide rails inside the upper flow passage.

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1. An apparatus to allow or stop a flow into a piping system or an enclosed environment, comprising: (a) a housing having an upper flow passage, a gasket, and a lower flow passage, wherein said gasket is between said upper flow passage and said lower flow passage, and wherein said gasket has an inne

1. An apparatus to allow or stop a flow into a piping system or an enclosed environment, comprising: (a) a housing having an upper flow passage, a gasket, and a lower flow passage, wherein said gasket is between said upper flow passage and said lower flow passage, and wherein said gasket has an inner diameter smaller than an inner diameter of said upper flow passage;(b) a rotary valve inside said housing, wherein said rotary valve further comprises a main body and two guides affixed to said main body in opposition to each other, wherein said rotary valve has a predetermined weight, wherein said main body of said rotary valve is dimensioned to be between said inner diameter of said gasket and said inner diameter of said upper flow passage, wherein said rotary valve can rotate axially relative to said guides when said flow from said lower flow passage flows through the housing, and wherein said rotary valve can move inside said upper flow passage and above said gasket; and(c) two guide rails inside the upper flow passage for guiding the rotary valve between an open position and a closed position, wherein said each of two guides of said rotary valve are disposed in each of said two guide rails, and wherein said two guides move freely up and down in said two guide rails. 2. The apparatus of claim 1, wherein an upper flow passage pressure exists in said upper flow passage, wherein a lower flow passage pressure exists in said lower flow passage, wherein said rotary valve is in said closed position when said rotary valve rests on said gasket to seal said gasket, wherein said rotary valve is in said open position when said rotary valve moves away from said gasket to unseal said gasket, wherein said rotary valve is in said open position when said lower flow passage pressure is greater than said predetermined weight of said rotary valve and said upper flow passage pressure, wherein said rotary valve is in said closed position when said lower flow passage pressure is less than or equal to said predetermined weight of said rotary valve and said upper flow passage pressure, wherein said flow cannot pass through said gasket when said rotary valve is in said closed position, and wherein said flow can pass through said gasket when rotary valve is in said open position. 3. The apparatus of claim 1, further comprising a turbulator on each of said two guides, wherein said turbulator comprises a plurality of impellers radially affixed to each of said guides, and wherein said turbulator rotates said rotary valve axially relative to said guides when said flow from said lower flow passage pushes said plurality of impellers. 4. The apparatus of claim 1, further comprising an upper flow passage filter located in said upper flow passage and a lower flow passage filter located in said lower flow passage, wherein said upper flow passage filter and said lower flow passage filter have a predetermined sieve size to prevent a plurality of foreign objects from entering said housing. 5. The apparatus of claim 1, wherein said apparatus is configured to be inside said enclosed environment, wherein said enclosed environment has an ambient pressure in said enclosed environment, wherein said enclosed environment further comprises at least one conduit, wherein each said at least one conduit has a first end and a second end, wherein each of said at least one conduit has said first end connected to said lower flow passage of said apparatus and said second end extends out of said enclosed environment, wherein said upper flow passage pressure is adopted to said ambient pressure of said enclosed environment, wherein said rotary valve is in said open position when said lower flow passage pressure is greater than said predetermined weight of said rotary valve and said upper flow passage pressure, and wherein said rotary valve is in said closed position when said lower flow passage pressure is equal to or less than said predetermined weight of said rotary valve and said upper flow passage pressure. 6. The apparatus of claim 1, wherein said apparatus is configured to be outside said enclosed environment, wherein said enclosed environment has an ambient pressure in said enclosed environment, wherein said enclosed environment further comprises at least one conduit, wherein each said at least one conduit has a first end and a second end, wherein each of said at least one conduit has said first end connected to said upper flow passage of said apparatus and said second end connected to and communicated with said enclosed environment, wherein said upper flow passage pressure is adopted to said ambient pressure of said enclosed environment, wherein said rotary valve is in said open position when said lower flow passage pressure is greater than said predetermined weight of said rotary valve and said upper flow passage pressure, and wherein said rotary valve is in said closed position when said lower flow passage pressure is equal to or less than said predetermined weight of said rotary valve and said upper flow passage pressure. 7. The apparatus of claim 1, wherein said apparatus is installed in a piping system, wherein said piping system has a pipe flow moves between a lower elevation position of said piping system to a upper elevation position of said piping system, wherein said upper flow passage of said apparatus is communicated with said upper elevation position of said piping system, wherein said lower flow passage is communicated with said lower elevation position of said piping system, wherein said rotary valve is in an open position, wherein said pipe flow moves from said lower elevation position of said piping system toward said upper elevation position of said piping system, and wherein said rotary valve is in said closed position wherein said pipe flow moves from said upper elevation position of said piping system toward said lower elevation of said piping system. 8. The apparatus of claim 1, wherein said main body of said rotary valve is made of a flexible material having a Shore Hardness about 60 A to about 90 A. 9. The apparatus of claim 1, wherein said main body of said rotary valve has a hard inner core and a flexible material outer core around said hard inner core. 10. The apparatus of claim 1, wherein said main body of said rotary valve has a flexible material outer core and is hollow inside said main body. 11. An apparatus to allow or stop a flow into a piping system or an enclosed environment, comprising: (a) a housing having an upper flow passage, a gasket, and a lower flow passage, wherein said gasket is between said upper flow passage and said lower flow passage, and wherein said gasket has an inner diameter smaller than an inner diameter of said upper flow passage;(b) a rotary valve inside said housing, wherein said rotary valve further comprises a main body and two guides affixed to said main body in opposition to each other, wherein said rotary valve has a predetermined weight, wherein said main body of said rotary valve is dimensioned to be between said inner diameter of said gasket and said inner diameter of said upper flow passage, and wherein said rotary valve can move inside said upper flow passage and above said gasket;(c) two guide rails inside the upper flow passage for guiding the rotary valve between an open position and a closed position, wherein said each of two guides of said rotary valve are disposed in each of said two guide rails, and wherein said two guides move freely up and down in said two guide rails;(d) an upper flow passage filter; and(e) a lower flow passage filter, wherein said upper flow passage filter and said lower flow passage filter have a predetermined sieve size to prevent a plurality of foreign objects from entering said housing, wherein an upper flow passage pressure exists in said upper flow passage, wherein a lower flow passage pressure exists in said lower flow passage, wherein said rotary valve is in said closed position when said rotary valve rests on said gasket to seal said gasket, wherein said rotary valve is in said open position when said rotary valve moves away from said gasket to unseal said gasket, wherein said rotary valve is in said open position when said lower flow passage pressure is greater than said predetermined weight of said rotary valve and said upper flow passage pressure, wherein said rotary valve is in said closed position when said lower flow passage pressure is less than or equal to said predetermined weight of said rotary valve and said upper flow passage pressure, wherein said flow cannot pass through said gasket when said rotary valve is in said closed position, and wherein said flow can pass through said gasket when rotary valve is in said open position. 12. The apparatus of claim 11, wherein said apparatus is configured to be inside said enclosed environment, wherein said enclosed environment has an ambient pressure in said enclosed environment, wherein said enclosed environment further comprises at least one conduit, wherein each said at least one conduit has a first end and a second end, wherein each of said at least one conduit has said first end connected to said lower flow passage of said apparatus and said second end extends out of said enclosed environment, wherein said upper flow passage pressure is adopted to said ambient pressure of said enclosed environment, wherein said rotary valve is in said open position when said lower flow passage pressure is greater than said predetermined weight of said rotary valve and said upper flow passage pressure, and wherein said rotary valve is in said closed position when said lower flow passage pressure is equal to or less than said predetermined weight of said rotary valve and said upper flow passage pressure. 13. The apparatus of claim 11, wherein said apparatus is configured to be outside said enclosed environment, wherein said enclosed environment has an ambient pressure in said enclosed environment, wherein said enclosed environment further comprises at least one conduit, wherein each said at least one conduit has a first end and a second end, wherein each of said at least one conduit has said first end connected to said upper flow passage of said apparatus and said second end connected to and communicated with said enclosed environment, wherein said upper flow passage pressure is adopted to said ambient pressure of said enclosed environment, wherein said rotary valve is in said open position when said lower flow passage pressure is greater than said predetermined weight of said rotary valve and said upper flow passage pressure, and wherein said rotary valve is in said closed position when said lower flow passage pressure is equal to or less than said predetermined weight of said rotary valve and said upper flow passage pressure. 14. The apparatus of claim 11, wherein said apparatus is installed in a piping system, wherein said piping system has a pipe flow moves between a lower elevation position of said piping system to a upper elevation position of said piping system, wherein said upper flow passage of said apparatus is communicated with said upper elevation position of said piping system, wherein said lower flow passage is communicated with said lower elevation position of said piping system, wherein said rotary valve is in said open position, wherein said pipe flow moves from said lower elevation position of said piping system toward said upper elevation position of said piping system, and wherein said rotary valve is in said closed position wherein said pipe flow moves from said upper elevation position of said piping system toward said lower elevation of said piping system. 15. An apparatus to allow or stop a flow into a piping system or an enclosed environment, comprising: (a) a housing having an upper flow passage, a gasket, and a lower flow passage, wherein said gasket is between said upper flow passage and said lower flow passage, and wherein said gasket has an inner diameter smaller than an inner diameter of said upper flow passage;(b) a rotary valve inside said housing, wherein said rotary valve further comprises a main body and two guides affixed to said main body in opposition to each other, wherein said rotary valve has a predetermined weight, wherein said main body of said rotary valve is dimensioned to be between said inner diameter of said gasket and said inner diameter of said upper flow passage, and wherein said rotary valve can move inside said upper flow passage and above said gasket;(c) two guide rails inside the upper flow passage for guiding the rotary valve between an open position and a closed position, wherein said each of two guides of said rotary valve are disposed in each of said two guide rails, and wherein said two guides move freely up and down in said two guide rails;(d) an upper flow passage filter; and(e) a lower flow passage filter, wherein said upper flow passage filter and said lower flow passage filter have a predetermined sieve size to prevent a plurality of foreign objects from entering said housing;(f) a turbulator on each of said two guides, wherein said turbulator comprises a plurality of impellers radially affixed to each of said guides, and wherein said turbulator rotates said rotary valve axially relative to said guides when said flow from said lower flow passage pushes said plurality of impellers; wherein an upper flow passage pressure exists in said upper flow passage, wherein a lower flow passage pressure exists in said lower flow passage, wherein said rotary valve is in a closed position when said rotary valve rests on said gasket to seal said gasket, wherein said rotary valve is in said open position when said rotary valve moves away from said gasket to unseal said gasket, wherein said rotary valve is in said open position when said lower flow passage pressure is greater than said predetermined weight of said rotary valve and said upper flow passage pressure, wherein said rotary valve is in said closed position when said lower flow passage pressure is less than or equal to said predetermined weight of said rotary valve and said upper flow passage pressure, wherein said flow cannot pass through said gasket when said rotary valve is in said closed position, and wherein said flow can pass through said gasket when rotary valve is in said open position. 16. The apparatus of claim 15, wherein said apparatus is configured to be inside said enclosed environment, wherein said enclosed environment has an ambient pressure in said enclosed environment, wherein said enclosed environment further comprises at least one conduit, wherein each said at least one conduit has a first end and a second end, wherein each of said at least one conduit has said first end connected to said lower flow passage of said apparatus and said second end extends out of said enclosed environment, wherein said upper flow passage pressure is adopted to said ambient pressure of said enclosed environment, wherein said rotary valve is in said open position when said lower flow passage pressure is greater than said predetermined weight of said rotary valve and said upper flow passage pressure, and wherein said rotary valve is in said closed position when said lower flow passage pressure is equal to or less than said predetermined weight of said rotary valve and said upper flow passage pressure. 17. The apparatus of claim 15, wherein said apparatus is configured to be outside said enclosed environment, wherein said enclosed environment has an ambient pressure in said enclosed environment, wherein said enclosed environment further comprises at least one conduit, wherein each said at least one conduit has a first end and a second end, wherein each of said at least one conduit has said first end connected to said upper flow passage of said apparatus and said second end connected to and communicated with said enclosed environment, wherein said upper flow passage pressure is adopted to said ambient pressure of said enclosed environment, wherein said rotary valve is in said open position when said lower flow passage pressure is greater than said predetermined weight of said rotary valve and said upper flow passage pressure, and wherein said rotary valve is in said closed position when said lower flow passage pressure is equal to or less than said predetermined weight of said rotary valve and said upper flow passage pressure. 18. The apparatus of claim 15, wherein said apparatus is installed in a piping system, wherein said piping system has a pipe flow moves between a lower elevation position of said piping system to a upper elevation position of said piping system, wherein said upper flow passage of said apparatus is communicated with said upper elevation position of said piping system, wherein said lower flow passage is communicated with said lower elevation position of said piping system, wherein said rotary valve is in said open position, wherein said pipe flow moves from said lower elevation position of said piping system toward said upper elevation position of said piping system, and wherein said rotary valve is in said closed position wherein said pipe flow moves from said upper elevation position of said piping system toward said lower elevation of said piping system.