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A paint cup assembly for a paint sprayer is disclosed and can include a paint reservoir, a cap configured to engage the paint reservoir, and a valve assembly disposed within the cap. The cap can include an outlet and the valve assembly can be operable from a closed configuration in which fluid flow

A paint cup assembly for a paint sprayer is disclosed and can include a paint reservoir, a cap configured to engage the paint reservoir, and a valve assembly disposed within the cap. The cap can include an outlet and the valve assembly can be operable from a closed configuration in which fluid flow through the outlet is prevented to an open configuration in which fluid flow through the outlet is permitted upon engagement with a paint sprayer.

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1. A paint cup assembly for a paint sprayer, the paint cup assembly comprising: a paint reservoir;a cap configured to engage the paint reservoir, the cap having an outlet;a valve assembly disposed within the cap, wherein the valve assembly includes a plunger having a head and a shaft, and wherein th

1. A paint cup assembly for a paint sprayer, the paint cup assembly comprising: a paint reservoir;a cap configured to engage the paint reservoir, the cap having an outlet;a valve assembly disposed within the cap, wherein the valve assembly includes a plunger having a head and a shaft, and wherein the head of the plunger is configured to engage a valve seat formed in the outlet, wherein prior to engagement with a paint sprayer the valve assembly is in a closed configuration in which a paint flow through the outlet is prevented, and wherein after engagement with the paint sprayer the valve assembly is automatically in an open configuration in which the paint flow through the outlet is permitted; anda valve retainer installed within the cap, wherein the valve retainer is configured to retain the valve assembly within the cap,wherein the valve assembly is adapted to be disposed below the paint reservoir during operation. 2. The paint cup assembly of claim 1, wherein the valve assembly is installed between the outlet and the valve retainer. 3. The paint cup assembly of claim 2, wherein the valve assembly comprises a spring loaded valve assembly. 4. The paint cup assembly of claim 3, wherein the valve assembly is adapted such that the paint flow passes between the plunger and the outlet when the valve assembly is in the open configuration. 5. The paint cup assembly of claim 4, wherein the spring loaded valve assembly further comprises: a spring disposed around the shaft of the plunger, wherein the spring is installed in compression between the head of the plunger and the valve retainer and wherein the spring provides a biasing force to move the valve assembly to the closed configuration as the paint cup assembly is disengaged with a paint sprayer. 6. The paint cup assembly of claim 1, wherein the valve retainer comprises a generally flat disk. 7. The paint cup assembly of claim 6, wherein the valve retainer is formed with one or more windows, wherein each of the one or more windows comprises a filter material disposed therein. 8. The paint cup assembly of claim 1, further comprising: an adapter, wherein the adapter is configured to be installed within a spray gun and configured to receive the paint cup assembly, wherein the adapter is configured to open the valve assembly as the paint cup assembly is engaged with the adapter, and wherein the adapter comprises: an adapter body;an outer wall; andan internal bore formed along the length of the adapter body and circumscribed by the outer walla valve actuator disposed within the internal bore. 9. The paint cup assembly of claim 8, wherein the valve actuator comprises a post and wherein the post is configured to open the valve assembly as the outlet of the paint cup assembly is inserted into the adapter. 10. The paint cup assembly of claim 1, wherein a head of the plunger includes one or more flutes. 11. A paint cup assembly for a paint sprayer, comprising: a paint reservoir;a cap configured to engage the paint reservoir, the cap having an outlet;a valve assembly disposed within the cap, wherein the valve assembly includes a plunger having a head and a shaft, and wherein the head of the plunger is configured to engage a valve seat formed in the outlet, wherein the valve assembly is configured to be operable from a closed configuration in which a paint flow through the outlet is prevented to an open configuration in which the paint flow through the outlet is permitted upon engagement with a paint sprayer;a valve retainer installed within the cap, wherein the valve retainer is configured to retain the valve assembly within the cap; anda membrane disposed over an end of the outlet, wherein the membrane is configured to be pierced by a trocar as the paint cup assembly is engaged with a paint sprayer. 12. The paint cup assembly of claim 1, wherein the paint sprayer is gravity fed. 13. The paint cup assembly of claim 1, wherein the valve assembly is configured to return to the closed configuration upon disengagement with the paint sprayer. 14. A paint sprayer assembly comprising: a paint sprayer; anda paint cup assembly engaged with the paint sprayer, the paint cup assembly comprising: a paint reservoir;a cap configured to engage the paint reservoir, the cap having an outlet;a valve assembly disposed within the cap, wherein the valve assembly includes a plunger having a head and a shaft, and wherein the head of the plunger is configured to engage a valve seat formed in the outlet, wherein the valve assembly is automatically configured to be operable from a closed configuration in which a paint flow through the outlet is prevented to an open configuration in which the paint flow through the outlet is permitted upon engagement with the paint sprayer; anda valve retainer installed within the cap, wherein the valve retainer is configured to retain the valve assembly within the cap,wherein the paint cup assembly is disposed above the paint spray gun. 15. The paint sprayer assembly of claim 14, wherein a head of the plunger includes one or more flutes. 16. The paint sprayer assembly of claim 14, wherein the valve retainer comprises a generally flat disk. 17. The paint sprayer assembly of claim 14, wherein the valve assembly is configured to return to the closed configuration upon disengagement with the paint sprayer.