Microdispensing pump

摘要

Various pump features are provided. In a first aspect of the subject invention, an evaporation-reduction feature is provided, wherein a pump having an actuator with a nozzle is provided with a releasable cap having a first shield located to entrap a fixed volume of air about the nozzle. In a second aspect, a check valve element return feature is provided wherein a valve seat is located along the pump's internal fluid passage with a plurality of delectable spring arms extending therefrom being deflectable in response to movement of a check valve element away from the valve seat. In a third aspect, a complaint shut-off valve feature is provided. In a fourth aspect, a fluid trapping well is provided, wherein fluid may be trapped within the well portion at various angular orientations of the pump to communicate directly with the pump inlet.

主权项

1. A pump comprising:
an actuator having a nozzle; a releasable cap for selectively covering said actuator, said releasable cap including a first shield, having an inner surface, located to at least partially cover said nozzle with said cap covering said actuator, said first shield entrapping a fixed volume of air about said nozzle when at least partially covering said nozzle, and an annular rim located about, and protruding from, said nozzle, wherein, said inner surface of said first shield being formed to abut said rim with said first shield at least partially covering said nozzle, wherein said releasable cap further includes a second shield located spaced-apart from said first shield.