METERING DISPENSING SYSTEM WITH IMPROVED VALVING TO PREVENT ACCIDENTAL DISPENSING OF LIQUID THEREFROM

摘要

A liquid dispensing device (300) includes a storage container (320) and dome pump mechanism (426) attached thereto for metered dispensing. A oneway valve (408) is employed to pull liquid from the storage container (320) into the dome (404) for metering. An exit passageway (436) serves as an output valve. Each time the dome pump housing (426) is depressed, a substantially equal volume of fluid is dispensed from the container (320). To prevent accidental dispensing, the one-way valve (408) in the dome pump (426) remains normally open and unsealed to allow backflow of liquid back into the storage container (320) pouch when pressure is placed on the dome (404). The user squeezes the dome (404) and base plate (410) together to seal the one-way valve (408) to urge liquid out through the exit port (436) for actual dispensing. Also, interior pouch force creates blackflow through the exit port back (436) into the containment chamber (405) to further prevent leakage.