HORIZONTAL PUMPS, REFILL UNITS AND FOAM DISPENSERS

摘要

Disposable refill units, and pumps for disposable refill units for foam dispensers are disclosed herein. Exemplary embodiments include a container (221) for holding a foamable liquid and a pump (201) secured to the container (221). The pump (201) includes a liquid chamber (204) formed between a liquid inlet valve (226) and a liquid outlet valve (264). In addition, the pump (201) includes a sleeve (232) that is located at least partially within the liquid chamber (204). One or more liquid passages (208) are defined at least in part by an area located between an exterior wall of the sleeve (232) and a wall of the liquid chamber (204). The pump (201) also includes a piston body (2540) having a head (207) and a sealing member (244) located at a first end of the piston. The sealing member (244) forms a seal against the interior wall of the sleeve (232) and the piston head (207) moves within the sleeve (232) to reduce and enlarge the volume of the liquid chamber (204).