DISPENSERS, REFILL UNITS AND PUMPS HAVING SUCK-BACK FEATURES

摘要

Exemplary embodiments of dispensers and refill units having suck-back mechanisms are disclosed herein. An exemplary refill unit includes a container, a pump connected to the container, and an outlet passage. The outlet passage includes a first cylindrical portion and a second portion. The diameter of the second portion is larger than the diameter of the first cylindrical portion. An inline suck-back valve is located in the in the outlet passage. The inline-suck-back valve moves within the first cylindrical portion and the second portion of the outlet passage. Movement of the inline suck-back valve in a first direction while the inline suck-back valve is located within the first cylindrical portion causes fluid in the outlet passage to be drawn back into the outlet passage.