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A valve for use with an aerosol container including a valve body, a valve stem having a dispensing passage, and a sealing ring contacting the valve stem. The sealing ring includes a sealing portion. The valve stem is slidably moveable relative to the sealing ring from a valve-closed position to a va

A valve for use with an aerosol container including a valve body, a valve stem having a dispensing passage, and a sealing ring contacting the valve stem. The sealing ring includes a sealing portion. The valve stem is slidably moveable relative to the sealing ring from a valve-closed position to a valve-open position. The interior of the valve body is in communication with the dispensing passage when the valve stem is in the valve-open position. The sealing ring also includes a wiper component to wipe the valve stem. The valve is preferably a metering valve.

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1. A valve comprising:a valve body defining a metering chamber in communication with a dispensing passage; and, a valve stem having the dispensing passage and transfer passage, the valve stem contacting and slidably movable with respect to a first sealing ring including a first sealing portion and a

1. A valve comprising:a valve body defining a metering chamber in communication with a dispensing passage; and, a valve stem having the dispensing passage and transfer passage, the valve stem contacting and slidably movable with respect to a first sealing ring including a first sealing portion and a first wiper portion, wherein a stem-receiving part of the first sealing portion contacts a first of the valve stem, wherein a stem-receiving part of the first wiper portion contacts a second surface of the valve stem, and wherein there is an enclosed space between the first sealing portion, the first wiper portion, and a valve stem surface between the first surface of the valve stem and the second surface of the valve stem. 2. The valve according to claim 1, further including:a sampling chamber; and, a second sealing ring including a second sealing portion, wherein, in a valve-closed position, the dispensing passage is isolated from the metering chamber and the metering chamber is in communication with the sampling chamber via said transfer passage, wherein, in the valve-open position, the dispensing passage is in communication with the metering chamber and the transfer passage is isolated from the metering chamber; and, wherein the second sealing ring further includes a second wiper position adapted to wipe the valve stem. 3. The valve according to claim 1, wherein the first wiper portion is integral to the first sealing ring.4. The valve according to claim 1, wherein the first wiper portion is in curved contact with the valve stem.5. The valve according to claim 1, wherein the first sealing portion includes a square cut edge.6. The valve according to claim 1 wherein the first sealing portion includes a rounded edge.7. The valve according to claim 1, wherein the first wiper portion includes a tapered portion.8. The valve according to claim 1, further including a first layer of rigid material supporting the first wiper and sealing portion.9. The valve according to claim 8 wherein the layer is constructed from a material selected from the group consisting of a polybutylteraphthlate, polyoxymethylene, metal and nylon.10. The valve according to claim 1, wherein the first sealing portion includes a lobed portion.11. The valve according to claim 1, wherein the first sealing ring is constructed by moulding.12. The valve according to claim 11, wherein the first sealing ring is made by compression moulding or injection moulding.13. The valve according to claim 1, wherein the first sealing ring is formed from an elastomeric material.14. The valve according to claim 13 wherein the elastomeric material is selected from the group consisting of:a copolymer of about 80 to about 95 mole % ethylene and about 5 to about 20 mole % of one or more of 1-butene, 1-hexene and 1-octene; a styrene-ethylene/butylene-styrene block copolymer; an ethylene propylene diene rubber; a styrene-ethylene/butylene-styrene dispersed in a polypropylene or polyethylene matrix; a butyl polyethylene; a butyl-polypropylene; and mixtures thereof. 15. The valve according to claim 1, wherein the first sealing ring is fixed relative to the valve body.16. The valve according to claim 15, wherein the first sealing ring is fixed within a cavity in the valve body.17. A drug product comprising:an aerosol container in communication with a valve according to claim 1. 18. The drug product of claim 17, further comprising a suspension of medicament in a propellant contained within the aerosol container.19. The drug product according to claim 18, wherein the propellant is liquefied HFA134a or HFA-227 or mixtures thereof.20. The drug product according to claim 18, where the medicament is selected from the group consisting of albuterol, salmeterol, fluticasone, beclomethasone, salt, esters or solvates thereof, and combinations thereof.21. The drug product according to claim 20 wherein the medicament comprises salmeterol xinafoate and fluticasone propionate.22. The valve according to claim 1, wherein the first sealing ring includes a second wiper portion.23. A valve comprising:a valve body defining a metering chamber in communication with a dispensing passage; and, a valve stem having the dispensing pass go and a transfer passage, the valve stem contacting and slidably movable with respect to a sealing ring including a sealing portion and a wiper portion, wherein the wiper portion is in curved contact with the valve stem. 24. The valve according to claim 23, wherein the wiper portion is integral to the sealing ring.25. The valve according to claim 23, wherein a stem-receiving part of the sealing portion that contacts the valve stem has a rounded edge.26. The valve according to claim 23, wherein a layer of rigid material is positioned between the sealing portion and the wiper portion.27. The valve according to claim 26, wherein the layer is constructed from a material selected from the group consisting of a polybutylteraphthlate, polyoxymethylene, metal and nylon.28. The valve according to claim 23, wherein the sealing ring includes a first wiper portion and a second wiper portion.29. The valve according to claim 23, wherein the sealing ring comprises an elastomeric material.30. A drug product comprising:an aerosol container in communication with a valve according to claim 23. 31. The drug product according to claim 30, further comprising a suspension of medicament in a propellant contained within the aerosol container.32. The drug product according to claim 31, wherein the propellant is liquified HFA134a or HPA-227 or mixtures thereof.33. The drug product according to claim 31, wherein the medicament is selected from the group consisting of albuterol, salmeterol fluticasone, beclomethasone, salts, esters or solvates thereof, and combinations thereof.34. A valve comprising:a valve body defining a metering chamber in communication with a dispensing passage; and, a valve stem having the dispensing passage and a transfer passage, the valve stem contacting and slidably movable with respect to a sealing ring including a sealing portion, a wiper portion, and a layer of supporting rigid material positioned between the sealing portion and the wiper portion. 35. The valve according to claim 34, wherein the layer is constructed from a material selected from the group consisting of a polybutylteraphthlate, polyoxymethylene, metal and nylon.36. The valve according to claim 34, wherein a stem-receiving part of the sealing portion contacts a first surface of the valve stem, a stem-receiving part of the wiper portion contacts a second surface of the valve stem, and there is an enclosed space between the sealing portion, the wiper portion, and a valve stem surface between the first surface of the valve stem and the second surface of the valve stem, and wherein the wiper portion is in curved contact with the valve stem.37. The valve according to claim 34, wherein the wiper portion is integral to the sealing ring.38. The valve according to claim 34, wherein a stem-receiving part of the sealing portion contacts the valve stem and has a rounded edge.39. The valve according to claim 34, wherein the sealing ring includes a first wiper portion and a second wiper portion.40. The valve according to claim 34, wherein the sealing ring comprises an elastomeric material.41. A drug product comprising:an aerosol container in communication with a valve according to claim 34. 42. The drug product according to claim 41, further comprising a suspension of medicament in a propellant contained within the aerosol container.43. The drug product according to claim 42, wherein the propellant is liquified HFA134a or HFA-227 or mixtures thereof.44. The drug product according to claim 42, wherein the medicament is selected from the group consisting of albuterol, salmeterol, fluticasone, beclomethasone, salts, esters or solvates thereof, and combinations thereof.45. A valve comprising:a valve body defining a metering chamber in communication with a dispensing passage; a sampling chamber; a valve stem having the dispensing passage and a transfer passage, the valve stem contacting and slidably movable with respect to a first sealing ring including a first sealing portion; and a second sealing ring including a second sealing portion; wherein, in a valve-closed position, the dispensing passage is isolated from the metering chamber and the metering chamber is in communication with the sampling chamber via said transfer passage; wherein, in the valve-open position, the dispensing passage is in communication with the metering chamber and the transfer passage is isolated from the metering chamber; wherein the first sealing ring further includes a first wiper portion adapted to wipe the valve stem; wherein the second sealing ring further includes a second wiper portion adapted to wipe the valve stem; and wherein the first and/or second sealing ring is constructed by a moulding process. 46. A valve comprising:a valve body; and a valve stem having a dispensing passage, and, said valve stem, a sealing ring including a sealing portion; the valve stem being slidably movable relative to the sealing ring from a valve-closed position to a valve-open position in which the interior of the valve body is in communication with the dispensing passage, wherein the sealing ring further includes a wiper portion configured to wipe the valve stem on sliding movement of the valve stem relative to the sealing ring, wherein the sealing portion presents a sealing surface in sealing engagement with the valve stem, wherein the wiper portion presents a wiper surface in wiping engagement with the valve stem, and wherein the sealing ring further has a void portion which is juxtaposed to the valve stem and located between the sealing and wiper surfaces for spatial separation of the sealing and wiper surfaces. 47. The valve according to claim 46, wherein the wiper portion is an integral part of the sealing ring.48. The valve according to claim 46, wherein the wiper portion is in curved contact with the valve stem.49. The valve according to claim 46, wherein the sealing surface and the wiping surface have rounded edges.50. The valve according to claim 46, wherein the seal and wiper are spaced apart by a layer of supporting rigid material.51. The valve according to claim 46, wherein the rigid material is selected from the group consisting of polybutylteraphthlate, polyoxymethylene, a metal and nylon.52. The valve according to claim 46, wherein the sealing ring comprises a first wiper and a second wiper.53. The valve according to claim 46, wherein the sealing ring comprises an elastomer material.54. A drug product comprising:an aerosol container in communication with a valve according to claim 46. 55. The drug product according to claim 54, further comprising a suspension of medicament in a propellant contained within the aerosol container.56. The drug product according to claim 55, wherein the propellant is liquefied HFA134a or HFA-277 or mixtures thereof.57. The drug product according to claim 55, wherein the medicament is selected from the group consisting of albuterol, salmeterol, fluticasone, beclomethasone, salts, esters or solvates thereof, and combinations thereof.