FLUID DISPENSER HAVING A HOUSING AND FLEXIBLE INNER BLADDER

摘要

A dispenser (10) for dispensing a fluid includes a rigid vial (52) that has a main fluid chamber (55) containing a fluid, and a pump assembly (50) that is in fluid communication with the main fluid chamber (55) and is configured to dispense a predetermined quantity of fluid from the main fluid chamber (55). A flexible bladder (54) is provided which is located within the main fluid chamber (55) and is configured to expand to fill the ullage created within t he main fluid chamber (55) during dispensing of fluid by the pump assembly (50) . The resilient bladder (54) tends to force itself outwardly toward the rigid vial (52) and, in turn, increases the pressure within the main fluid chamber (55) in comparison to the interior of the bladder (54) to thereby prevent th e ingress of air or vapors through the bladder (54) or otherwise into the main fluid chamber (55).