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A foam-dispensing pump includes an actuator, a collar, a housing, an air piston, a liquid piston, a mesh element and an air valve structure. The collar is constructed and arranged for attachment to a liquid storage container and a portion of the actuator is received by the collar. The air piston is

A foam-dispensing pump includes an actuator, a collar, a housing, an air piston, a liquid piston, a mesh element and an air valve structure. The collar is constructed and arranged for attachment to a liquid storage container and a portion of the actuator is received by the collar. The air piston is constructed and arranged to be moveable within the housing. The liquid piston is constructed and arranged to be moveable within the housing. The mesh element is constructed and arranged to receive air and liquid for the production of foam. The air valve structure includes an annular sleeve component which is assembled onto the liquid piston and a cooperating annular valve element which is received by the air piston.

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1. A foam-dispensing pump comprising: an actuator;a collar constructed and arranged for attachment to a liquid storage container, wherein a portion of said actuator is received by said collar;a housing;an air piston which is constructed and arranged to be moveable within said housing;a liquid piston

1. A foam-dispensing pump comprising: an actuator;a collar constructed and arranged for attachment to a liquid storage container, wherein a portion of said actuator is received by said collar;a housing;an air piston which is constructed and arranged to be moveable within said housing;a liquid piston which is constructed and arranged to be moveable within said housing;a mesh element which is constructed and arranged to receive air and liquid for the production of foam; andan air valve structure including an annular sleeve component assembled onto said liquid piston and a cooperating annular valve element received by said air piston, wherein said annular sleeve component is axially symmetrical about a horizontal centerline. 2. The foam-dispensing pump of claim 1 wherein said annular sleeve component includes an annular body and an outwardly radiating, flexible lip. 3. The foam-dispensing pump of claim 2 wherein said flexible lip generally coincides with a horizontal centerline. 4. The foam-dispensing pump of claim 2 wherein said annular body includes a first edge which defines a recessed notch and a second edge which defines a recessed notch. 5. The foam-dispensing pump of claim 2 wherein said air valve structure is constructed and arranged with said flexible lip in a deflected orientation against a portion of said annular valve element. 6. The foam-dispensing pump of claim 5 wherein said portion is a radially-inner annular edge of said annular valve element. 7. The foam-dispensing pump of claim 1 wherein said annular sleeve component includes an annular lip which is preloaded against said annular valve element. 8. The foam-dispensing pump of claim 7 wherein said annular sleeve component is axially reversible. 9. The foam-dispensing pump of claim 8 wherein said annular sleeve component includes an axially outer surface which defines a plurality of air-flow apertures. 10. The foam-dispensing pump of claim 1 wherein said annular sleeve component is constructed and arranged with a first axially outer surface and with a second axially outer surface. 11. The foam-dispensing pump of claim 10 wherein the assembly of said foam dispensing pump positions either one of said axially outer surfaces adjacent a surface of said piston due to the reversible construction of said annular sleeve component. 12. The foam-dispensing pump of claim 11 wherein each axially outer surface defines a recessed notch. 13. A foam-dispensing pump comprising: an actuator;a collar constructed and arranged for attachment to a liquid storage container, wherein a portion of said actuator is received by said collar;a housing;an air piston which is constructed and arranged to be moveable within said housing;a liquid piston which is constructed and arranged to be moveable within said housing;means for the production of foam; andan air valve structure constructed and arranged with a first component assembled into the air piston and with a cooperating second component assembled onto the liquid piston,wherein said second component includes an annular sleeve component which includes an annular body and an outwardly radiating, flexible lip and wherein said annular body includes a first edge which defines a recessed notch and a second edge which defines a recessed notch. 14. The foam-dispensing pump of claim 13 wherein said second component is axially symmetrical about a horizontal centerline. 15. The foam-dispensing pump of claim 13 wherein said air valve structure is constructed and arranged with said flexible lip in a deflected orientation against a portion of said first component. 16. An air valve structure for use in a foam-dispensing pump which includes an air piston and a liquid piston, said air valve structure comprising: an annular sleeve component which is constructed and arranged to assemble onto a portion of said liquid piston; andan annular valve element which is constructed and arranged to assemble into a portion of said air piston; wherein said annular sleeve component includes an outwardly radiating flexible lip which is preloaded into deflected engagement against said annular valve element. 17. The air valve structure of claim 16 wherein said annular valve element includes a radially inner edge and wherein said flexible lip is preloaded into deflected engagement against said radially inner edge of said annular valve element. 18. The air valve structure of claim 17 wherein said annular sleeve component includes an annular body which includes the first edge which defines a recessed notch and a second edge which defines a recessed notch.