HORIZONTAL PUMPS, REFILL UNITS AND FOAM DISPENSERS WITH INTEGRAL AIR COMPRESSORS

摘要

Foam dispensers having integral air compressors with connectors to connect with a disposable refill unit, disposable refill units and liquid pumps are disclosed herein. A refill unit includes a container and a liquid pump. The liquid pump includes a liquid chamber (320) defined at least in part by a liquid inlet valve (314) and a liquid outlet valve (330). A piston (350) that reciprocates horizontally in the liquid chamber (320). A mixing chamber (336) is located downstream of the liquid chamber. The mixing chamber (336) is in fluid communication with the liquid chamber (320) and has an air inlet (404). A sanitary seal (338) is located proximate the air inlet (404) to prevent liquid from contaminating the air compressors.