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A relief vent including a vent body having an opening configured to be in communication with the internal volume of a tank. The relief vent further includes a movable portion that is movable relative to the vent body. The movable portion or the vent body includes a base and a sealing member coupled

A relief vent including a vent body having an opening configured to be in communication with the internal volume of a tank. The relief vent further includes a movable portion that is movable relative to the vent body. The movable portion or the vent body includes a base and a sealing member coupled thereto. At least part of the sealing member is elastically deformed to press at least a portion the sealing member against the base. The portion of the sealing member pressed against the base is positioned to sealingly engage the other one of the movable portion or the vent body.

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1. A relief vent comprising: a vent body having an opening configured to be in communication with the internal volume of a tank; anda movable portion that is movable relative to said vent body, wherein the movable portion or the vent body includes a base and a sealing member coupled thereto, and whe

1. A relief vent comprising: a vent body having an opening configured to be in communication with the internal volume of a tank; anda movable portion that is movable relative to said vent body, wherein the movable portion or the vent body includes a base and a sealing member coupled thereto, and wherein a radially inner portion of said sealing member is elastically deformed to press a radially outer portion of said sealing member against said base, wherein said portion of said sealing member pressed against said base is positioned to sealingly engage the other one of said movable portion or said vent body; wherein the other one of the vent body or the movable portion includes an elastic or resilient seal carried thereon, said seal being configured to sealingly engage said portion of said sealing member pressed against said base. 2. The vent of claim 1 wherein said movable portion includes said base and said sealing member coupled thereto, and wherein said portion of said sealing member pressed against said base is configured to sealingly engage said vent body. 3. The vent of claim 1 wherein said movable portion is movable between a closed position, wherein the movable portion generally sealingly engages the vent body, and an open position, wherein the movable portion generally does not sealingly engage the vent body to allow venting thereof, and wherein said sealing member is configured to generally form a seal with the other one of the vent body or the movable portion when the movable portion is in the closed position. 4. The vent of claim 3 wherein said movable portion is biased into said closed position. 5. The vent of claim 4 wherein said vent is configured such that when sufficient pressure is generated in said internal volume said pressure causes said movable portion to move to said open position to allow at least some of said pressure from said internal volume to be vented, after which said movable portion automatically moves to said closed position. 6. The vent of claim 1 wherein said inner portion of said sealing member is engaged to cause said elastic deformation, and wherein said outer portion pressed against said base is an outer portion of said sealing member spaced away from said inner portion. 7. The vent of claim 6 wherein said outer portion of said sealing member is pressed against an outer portion of said base. 8. The vent of claim 7 wherein said outer portion of said base extends axially forwardly relative to adjacent areas of said base. 9. The vent of claim 6 wherein said inner portion of said sealing member is pressed against an inner portion of said base, and wherein said inner portion of said base extends axially forwardly relative to adjacent areas of said base. 10. The vent of claim 9 wherein said movable portion is biased into said closed position solely by a weight of said movable portion. 11. The vent of claim 6 wherein said base includes a radially inner portion and a radially outer portion with a recessed area therebetween that is recessed relative to both said inner portion and said outer portion, and wherein said sealing member is coupled to said base such that said sealing member simultaneously contacts both said radially inner portion and said radially outer portion of said base. 12. The vent of claim 11 wherein said radially inner portion of said base is recessed, in the axial direction, relative to said radially outer portion of said base. 13. The vent of claim 6 further comprising a threaded fastener engaging said sealing member and urging said inner portion of said sealing member against a radially inner portion of said base. 14. The vent of claim 1 wherein said sealing member is generally flat and planar in the absence of outside forces, and wherein said sealing member is elastically deformed out of plane to press said portion of said sealing member against said base. 15. The vent of claim 1 wherein said seal has a deflectable lip portion extending generally toward the sealing member when said movable portion does not sealingly engage said vent body, and wherein the movable portion and lip are configured such that said movable portion engages said lip portion and deflects the lip portion when the movable portion sealingly engages said vent body. 16. The vent of claim 1 wherein said sealing member is elastically deformed by at least about 1/1000, but less than about 1/100, of a diameter of the sealing member. 17. The vent of claim 1 wherein said vent body is mounted on a tank and said opening is in communication with said internal volume of said tank. 18. The vent of claim 1 wherein said portion of said sealing member pressed against said base and configured to sealingly engage the other one of said movable portion or said vent body has a smoothness of less than about 150 microns. 19. The vent of claim 1 wherein said sealing member has a Young's modulus of at least about 10 GPa. 20. The vent of claim 1 wherein said sealing member is made of metal. 21. The vent of claim 1 wherein said pressure is vented from the internal volume of said tank directly to the ambient environment. 22. The vent of claim 1 wherein said vent is configured such that when sufficient pressure is present in said internal volume said pressure automatically causes said movable portion to move to allow at least some of said pressure from said internal volume to be vented. 23. The vent of claim 1 wherein said base includes a radially inner portion and a radially outer portion with a recessed area therebetween, and wherein said sealing member is coupled to said base such that said sealing member simultaneously contacts both said radially inner portion and said radially outer portion of said base and does not contact said recessed area. 24. A relief vent comprising: a vent body having an opening configured to be in communication with the internal volume of a tank; anda movable portion that is movable between a closed position, wherein the movable portion generally sealingly engages the vent body, and an open position, wherein the movable portion generally does not sealingly engage the vent body to allow venting thereof, wherein the movable portion includes a base and a metal sealing member coupled thereto, wherein an inner portion of said sealing member engages an inner portion of said base and is elastically deformed to directly cause an outer portion of said sealing member to be urged against an outer portion of said base, and wherein said sealing member is configured to generally form a seal with the vent body when the movable portion is in the closed position. 25. A relief vent comprising: a vent body having an opening configured to be in communication with the internal volume of a tank, said vent body having a sealing portion anda movable portion that is movable relative to said vent body, wherein the movable portion includes a base and a sealing member which is a separate and discrete piece of material from said base, wherein said sealing member is coupled to said base and positioned to sealingly engage said sealing portion of said vent body, wherein said sealing member is elastically deformed by a force applied at a radially inner portion of said sealing member and is in tension with said base when said movable portion is spaced away from said vent body in an open position, and wherein said sealing member has a Young's modulus of at least about 10 GPa. 26. The vent of claim 25 wherein said sealing member is made of a material which is more corrosion resistant than said base, or smoother than said base, or both. 27. The vent of claim 25 wherein said sealing member is made from material having differing material properties than those of said base. 28. The vent of claim 25 wherein said movable portion is movable between a closed position, wherein the movable portion generally sealingly engages the vent body, and an open position, wherein the movable portion generally does not sealingly engage the vent body to allow venting thereof, and wherein said sealing member is configured to generally form a seal with the sealing portion when the movable portion is in the closed position. 29. The vent of claim 28 wherein said sealing portion is a lip seal extending generally around the perimeter of said vent body, said lip seal being engaged and deflected by said movable portion when said movable portion is in said closed position. 30. The vent of claim 25 wherein said sealing member is a generally flat, planar metal disk. 31. The vent of claim 25 wherein at least part of said sealing member is elastically deformed to press at least a portion said sealing member against said base. 32. The vent of claim 25 wherein said sealing portion extends around a perimeter of said vent body, and wherein said sealing member extends around a perimeter of said movable portion. 33. A relief vent comprising: a vent body having a sealing surface and an opening configured to be in communication with the internal volume of a tank; anda movable portion that is movable between a closed position, wherein the movable portion generally forms a seal with the vent body, and an open position, wherein the movable portion generally does not form a seal with the vent body to allow venting thereof, the movable portion includes a sealing surface that engages the sealing surface of the vent body to form the seal, wherein the at least one of the sealing surfaces is made of a material that is corrosion resistant, or has a smoothness of less than about 150 microns, or both, and wherein said sealing surface of said movable portion has a Young's modulus of at least about 10 GPa. 34. A relief vent comprising: a vent body having an opening configured to be in communication with the internal volume of a tank; anda movable portion that is movable relative to said vent body, wherein the movable portion or the vent body includes a base and a sealing member coupled thereto, and wherein at least part of said sealing member is elastically deformed to press at least a portion of said sealing member against said base regardless of whether said movable portion is in an open position or a closed position, wherein said portion of said sealing member pressed against said base is positioned to sealingly engage the other one of said movable portion or said vent body, and wherein said movable portion is biased into the closed position in which said movable portion sealingly engages said vent body solely by a weight of said movable portion. 35. A relief vent comprising: a vent body having an opening configured to be in communication with the internal volume of a tank; anda movable portion that is movable relative to said vent body, wherein the movable portion or the vent body includes a base and a sealing member coupled thereto, and wherein a radially inner portion of said sealing member is elastically deformed to press a radially outer portion of said sealing member against said base, wherein said portion of said sealing member pressed against said base is positioned to sealingly engage the other one of said movable portion or said vent body;wherein said base includes a radially inner portion and a radially outer portion with a recessed area therebetween, and wherein said sealing member is coupled to said base such that said sealing member simultaneously contacts both said radially inner portion and said radially outer portion of said base and does not contact said recessed area.