| 摘要 |
A liquid dispensing device (300) includes a storage container (320) and d ome pump mechanism (500, 600) attached thereto for metered dispensing. A one -way valve (508, 612) is employed to pull liquid from the storage container (300) into the dome (508, 608) for metering. An exit passageway (506, 606) s erves as an output valve. Each time the dome pump housing (508, 608) is depr essed, a substantially equal volume of fluid is dispensed from the container (320). To prevent accidental dispensing, the one-way valve in the dome pump remains normally open and unsealed to allow backflow of liquid back into th e storage container (320) pouch when pressure is placed on the dome (508, 60 8). The user squeezes the dome (508, 608) and base plate together to seal th e one-way valve to urge liquid out through the exit port for actual dispensi ng. The dome pump (500, 600) is integrally formed with a top portion of the exit pathway. Optionally, the base plate (502) and bottom portion (504) of t he exit pathway are also integrally formed to facilitate manufacture and red uce costs of the pump (500, 600) while improving performance thereof. |
