Pumps with container vents

摘要

Exemplary embodiments of pumps, refill units and dispensers are disclosed herein. Some embodiments include a container (221) for holding a fluid and a pump housing (202) secured to the container (221). The pump housing (202) includes an annular collar for securing the pump housing (202) to the container (221). The pump housing (202) includes an air chamber (298) and a vent valve (294) located at least partially within the air chamber (298). One or more air passageways (290) are provided in the collar for providing air to the air chamber (298). A compressible liquid pump chamber (204) is also located in the housing (202). The exemplary embodiment includes a liquid inlet valve (226) for allowing liquid to flow from the container (221) into the compressible pump chamber (204); and a liquid outlet valve (264) located downstream of the pump chamber (204).