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A pressure swing adsorption system including a pressure vessel having an opening and a valve manifold including a body having a first cavity fluidly connected to the opening. The body further includes a passage and a channel, such that the passage connects the channel to the cavity. The valve manifo

A pressure swing adsorption system including a pressure vessel having an opening and a valve manifold including a body having a first cavity fluidly connected to the opening. The body further includes a passage and a channel, such that the passage connects the channel to the cavity. The valve manifold further includes a valve provided within the passage. The valve is configured to selectively permit and restrict flow between the channel and the cavity via the passage.

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1. A method of performing pressure swing adsorption comprising the steps of:providing a valve manifold having a cavity, a passage and a channel, the cavity being fluidly connected to an opening of an adsorbent vessel, the passage connecting the channel to the cavity, wherein the valve manifold inclu

1. A method of performing pressure swing adsorption comprising the steps of:providing a valve manifold having a cavity, a passage and a channel, the cavity being fluidly connected to an opening of an adsorbent vessel, the passage connecting the channel to the cavity, wherein the valve manifold includes a valve provided within the passage, the valve being configured to selectively permit and restrict flow between the channel and the cavity via the passage, the valve comprising a non-return valve, a metering orifice provided in parallel with the non-return valve, and an on/off valve provided in series with the non-return valve and the metering orifice,wherein product gas flows out of the adsorbent vessel through the non-return valve, the metering orifice and the on/off valve during an adsorption stage,wherein the product gas flows through the on/off valve and the metering orifice and into the adsorbent vessel during a counter-current flow stage, andwherein flow to and from the adsorbent vessel ceases when the on/off valve is closed. 2. The method according to claim 1, wherein the valve manifold comprises at least one additional valve configured to control fluid flow from the cavity to the channel that is connected to another adsorbent vessel. 3. The method according to claim 1, wherein:the non-return valve comprises a seal cup configured to receive the on/off valve therein;the metering orifice is provided through the seal cup; andthe seal cup is spring biased toward a valve seat provided in the passage. 4. The method according to claim 1, wherein the on/off valve is linearly actuated in contact with and out of contact with a valve seat provided in the passage. 5. A valve manifold for a pressure swing adsorption system having at least one pressure vessel, said valve manifold comprising:a body having a first cavity, a first passage and a first channel, said first cavity being adapted to fluidly connect to the at least one pressure vessel, said first passage connecting said first channel to said first cavity;a first valve provided within said first passage, said first valve being configured to selectively permit and restrict flow between said first channel and said first cavity via said first passage;a second cavity in said body adapted to fluidly connect to another pressure vessel, said body having a second passage connecting said first channel to said second cavity; anda second valve provided within said second passage, said second valve being configured to selectively permit and restrict flow between said first channel and said second cavity;wherein said first valve is configured to not restrict flow along said first channel. 6. The valve manifold according to claim 5, wherein:said body has a third passage and a second channel, said third passage connecting said second channel to said first cavity; andsaid valve manifold further comprises a third valve provided within said third passage, said third valve being configured to selectively permit and restrict fluid flow between said second channel and said first cavity. 7. The valve manifold according to claim 6, wherein said first channel and said second channel are configured to provide a parallel flow connection to said first cavity. 8. The valve manifold according to claim 6, wherein said first channel and said second channel are connected to a same side of said first cavity. 9. The valve manifold according to claim 5, wherein:said body has a third passage connecting said first channel to said first cavity; andsaid valve manifold further comprises a third valve provided within said third passage, said third valve being configured to selectively permit and restrict fluid flow between said first channel and said first cavity via said third passage. 10. The valve manifold according to claim 9, wherein:said body has a second channel and a fourth passage, said fourth passage connecting said second channel to said first cavity; andsaid valve manifold further comprises a fourth valve provided within said fourth passage, said fourth valve being configured to selectively permit and restrict fluid flow between said second channel and said first cavity via said fourth passage. 11. The valve manifold according to claim 5, wherein:said body has a second channel, a third passage and a fourth passage, said third passage connecting said second channel to said first cavity, said fourth passage connecting said second channel to said second cavity;said valve manifold further comprises a third valve provided within said third passage, said third valve being configured to selectively permit and restrict flow between said second channel and said first cavity; andsaid valve manifold further comprises a fourth valve provided within said fourth passage, said fourth valve being configured to selectively permit and restrict flow between said second channel and said second cavity. 12. The valve manifold according to claim 11, wherein said first channel and said second channel are configured to provide a parallel flow connection between said first cavity and said second cavity. 13. The valve manifold according to claim 5, wherein said second valve is configured to not restrict flow along said first channel. 14. The valve manifold according to claim 5, wherein said first valve is configured to not restrict flow within said cavity. 15. The valve manifold according to claim 5, wherein said body further comprises a sensor port connected to said cavity. 16. The valve manifold according to claim 5, wherein said body further comprises a sensor port connected to said first passage. 17. The valve manifold according to claim 5, wherein said body further comprises a sensor port connected to said first channel. 18. The valve manifold according to claim 5, wherein said first passage includes a valve seat and a valve port in which said first valve is received. 19. The valve manifold according to claim 18, wherein said valve seat is concentric with said valve port. 20. The valve manifold according to claim 5, wherein said first valve includes a valve seal configured to be selectively actuated between a sealed contact position with a valve seat in said first passage wherein said first channel is sealed from said first cavity and a non-contact position with said valve seat, said first valve further including a secondary seal member having a metering orifice. 21. A valve manifold for a pressure swing adsorption system having at least one pressure vessel, said valve manifold comprising:a body having a first cavity, a first passage and a first channel, said first cavity being adapted to fluidly connect to the at least one pressure vessel, said first passage connecting said first channel to said first cavity;a first valve provided within said first passage, said first valve being configured to selectively permit and restrict flow between said first channel and said first cavity via said first passage, wherein;said valve manifold is adapted to be rigidly connected to the at least one pressure vessel; andsaid valve manifold further comprises a mounting boss having a pin journal adapted for connection to a support structure. 22. A valve manifold for a pressure swing adsorption system having at least one pressure vessel, said valve manifold comprising:a body having a first cavity, a first passage and a first channel, said first cavity being adapted to fluidly connect to the at least one pressure vessel, said first passage connecting said first channel to said first cavity;a first valve provided within said first passage, said first valve being configured to selectively permit and restrict flow between said first channel and said first cavity via said first passage, wherein said first valve comprises:a non-return valve;a metering orifice provided in parallel with said non-return valve; andan on/off valve provided in series with said non-return valve and said metering orifice. 23. The valve manifold according to claim 22, wherein:said non-return valve co mprises a seal cup configured to receive said on/off valve therein;said metering orifice is provided through said seal cup; andsaid seal cup is spring biased toward a valve seat provided in said first passage. 24. The valve manifold according to claim 22, wherein said first valve includes a motive device configured to linearly actuate said on/off valve in contact with and out of contact with a valve seat provided in said first passage. 25. A valve manifold for a pressure swing adsorption system having at least two pressure vessels, said valve manifold comprising:a body having a first cavity, a first passage and a channel, said first cavity being adapted to fluidly connect to one of the at least two pressure vessels, said first passage connecting said channel to said first cavity, said body having a second cavity and a second passage, said second cavity being adapted to fluidly connect to another of the at least two pressure vessels, said second passage connecting said channel to said second cavity;first means for selectively permitting and restricting fluid flow between said channel and said first cavity ; andsecond means for selectively permitting and restricting fluid flow between said channel and said second cavity,wherein said first means is configured to not restrict flow along said channel. 26. A pressure swing adsorption system comprising:a first pressure vessel having a first opening;a second pressure vessel having a second opening; anda first valve manifold comprising:a first body having a first cavity, a first passage and a first channel, said first cavity being fluidly connected to said first opening of said first pressure vessel, said first passage connecting said first channel to said first cavity;a first valve provided within said first passage, said first valve being configured to selectively permit and restrict flow between said first channel and said first cavity via said first passages;a second cavity in said first body being fluidly connected to said second opening of said second pressure vessel, said first body having a second passage connecting said first channel to said second cavity; anda second valve provided within said second passage, said second valve being configured to selectively permit and restrict flow between said first channel and said second cavity.wherein said first valve is configured to not restrict flow along said first channel. 27. The pressure swing adsorption system according to claim 26, wherein:said first body has a third passage and a second channel, said third passage connecting said second channel to said first cavity; andsaid first valve manifold further comprises a third valve provided within said third passage, said third valve being configured to selectively permit and restrict fluid flow between said second channel and said first cavity. 28. The pressure swing adsorption system according to claim 27, wherein said first channel and said second channel are configured to provide a parallel flow connection to said first cavity. 29. The pressure swing adsorption system according to claim 27, wherein said first channel and said second channel are connected to a same side of said first cavity. 30. The pressure swing adsorption system according to claim 26, wherein:said first body has a third passage connecting said first channel to said first cavity; andsaid first valve manifold further comprises a third valve provided within said third passage, said third valve being configured to selectively permit and restrict fluid flow between said first channel and said first cavity via said third passage. 31. The pressure swing adsorption system according to claim 30, wherein:said first body has a second channel and a fourth passage, said fourth passage connecting said second channel to said first cavity; andsaid first valve manifold further comprises a fourth valve provided within said fourth passage, said fourth valve being configured to selectively permit and restrict fluid flow between sa id second channel and said first cavity via said fourth passage. 32. The pressure swing adsorption system according to claim 26, wherein:said first body has a second channel, a third passage and a fourth passage, said third passage connecting said second channel to said first cavity, said fourth passage connecting said second channel to said second cavity;said first valve manifold further comprises a third valve provided within said third passage, said third valve being configured to selectively permit and restrict flow between said second channel and said first cavity; andsaid first valve manifold further comprises a fourth valve provided within said fourth passage, said fourth valve being configured to selectively permit and restrict flow between said second channel and said second cavity. 33. The pressure swing adsorption system according to claim 32, wherein said first channel and said second channel are configured to provide a parallel flow connection between said first cavity and said second cavity. 34. The pressure swing adsorption system according to claim 26, wherein:said first valve is configured to not restrict flow along said first cavity;said second valve is configured to not restrict flow along said second cavity; andsaid second valve is configured to not restrict flow along said first channel. 35. The pressure swing adsorption system according to claim 26, further comprising:a third pressure vessel having a third opening; anda fourth pressure vessel having a fourth opening,wherein said first body of said first valve manifold comprises:a third cavity, a third passage, a fourth cavity and a fourth passage, said third cavity being fluidly connected to said third opening of said third pressure vessel, said third passage connecting said first channel to said third cavity, said fourth cavity being fluidly connected to said fourth opening of said fourth pressure vessel, said fourth passage connecting said first channel to said fourth cavity;a third valve provided within said third passage, said third valve being configured to selectively permit and restrict flow between said first channel and said third cavity via said third passage; anda fourth valve provided within said fourth passage, said fourth valve being configured to selectively permit and restrict flow between said first channel and said fourth cavity via said fourth passage. 36. The pressure swing adsorption system according to claim 35, wherein:said first valve is configured to not restrict flow along said first cavity;said first valve is configured to not restrict flow along said first channel;said second valve is configured to not restrict flow along said second cavity;said second valve is configured to not restrict flow along said first channel;said third valve is configured to not restrict flow along said third cavity;said third valve is configured to not restrict flow along said first channelsaid fourth valve is configured to not restrict flow along said fourth cavity; andsaid fourth valve is configured to not restrict flow along said first channel. 37. The pressure swing adsorption system according to claim 26, wherein said second valve is configured to not restrict flow along said first channel. 38. The pressure swing adsorption system according to claim 26, wherein said first valve is configured to not restrict flow within said first cavity. 39. The pressure swing adsorption system according to claim 26, wherein said first body further comprises a sensor port connected to said first cavity. 40. The pressure swing adsorption system according to claim 26, wherein said first body further comprises a sensor port connected to said first passage. 41. The pressure swing adsorption system according to claim 26, wherein said first body further comprises a sensor port connected to said first channel. 42. The pressure swing adsorption system according to claim 26, wherein said first pressure vessel has a third opening, said pressure swing adsorption system furt her comprising:a second valve manifold comprising:a second body having a third cavity, a third passage and a second channel, said third cavity being fluidly connected to said third opening of said first pressure vessel, said third passage connecting said second channel to said third cavity; anda third valve provided within said third passage, said third valve being configured to selectively permit and restrict flow between said second channel and said third cavity via said third passage. 43. The pressure swing adsorption system according to claim 42, wherein;said first valve manifold is rigidly connected to said first pressure vessel;said first valve manifold further comprises a first mounting boss having a pin journal adapted for pivotal connection to a support structure;said second valve manifold is rigidly connected to said first pressure vessel; andsaid second valve manifold further comprises a second mounting boss having a pin journal pivotally connected to a linkage that is adapted for pivotal connection to a support structure. 44. The pressure swing adsorption system according to claim 26, wherein said first passage includes a valve seat and a valve port in which said first valve is received. 45. The pressure swing adsorption system according to claim 44, whereinsaid valve seat is concentric with said valve port. 46. The pressure swing adsorption system according to claim 26, wherein said first valve includes a valve seal configured to be selectively actuated between a sealed contact position with a valve seat in said first passage wherein said first channel is sealed from said first cavity and a non-contact position with said valve seat, said first valve further including a secondary seal member having a metering orifice. 47. A pressure swing adsorption system comprising:a first pressure vessel having a first opening; anda first valve manifold comprising:a first body having a first cavity, a first passage and a first channel, said first cavity being fluidly connected to said first opening of said first pressure vessel, said first passage connecting said first channel to said first cavity; anda first valve provided within said first passage, said first valve being configured to selectively permit and restrict flow between said first channel and said first cavity via said first passage wherein;said first valve manifold is rigidly connected to said first pressure vessel; andsaid first valve manifold further comprises a first mounting boss having a pin journal adapted for connection to a support structure. 48. A pressure swing adsorption system comprising:a first pressure vessel having a first opening; anda first valve manifold comprising:a first body having a first cavity, a first passage and a first channel, said first cavity being fluidly connected to said first opening of said first pressure vessel, said first passage connecting said first channel to said first cavity; anda first valve provided within said first passage, said first valve being configured to selectively permit and restrict flow between said first channel and said first cavity via said first passage, wherein said first valve comprises:a non-return valve;a metering orifice provided in parallel with said non-return valve; andan on/off valve provided in series with said non-return valve and said metering orifice. 49. The pressure swing adsorption system according to claim 48, wherein:said non-return valve comprises a seal cup configured to receive said on/off valve therein;said metering orifice is provided through said seal cup; andsaid seal cup is spring biased toward a valve seat provided in said first passage. 50. The pressure swing adsorption system according to claim 48, wherein said first valve includes a motive device configured to linearly actuate said on/off valve in contact with and out of contact with a valve seat provided in said first passage. 51. A pressure swing adsorption system comprising:a first pressure vessel having a first opening;a sec ond pressure vessel having a first opening; anda valve manifold comprising:a body having a first cavity, a first passage and a channel, said first cavity being fluidly connected to said first opening of said first pressure vessel, said first passage connecting said channel to said first cavity, said body having a second cavity and a second passage, said second cavity being adapted to fluidly connect to said second opening of said second pressure vessel, said second passage connecting said channel to said second cavity;first means for selectively permitting and restricting fluid flow between said channel and said first cavity; andsecond means for selectively permitting and restricting fluid flow between said channel and said second cavity,wherein said first means is configured to not restrict flow along said channel.