VENTED CHECK VALVES, PUMPS AND REFILL UNITS WITH VENTED CHECK VALVES

摘要

Vented check valves, pumps and refill units for dispensers are disclosed herein. Some embodiments disclose a refill unit including a container for holding a liquid. A pump chamber is secured to the container. The pump chamber is defined at least in part by a one-way liquid inlet check valve, a one-way liquid outlet check valve and at least one wall. The volume of the pump chamber is movable between a first volume and a second volume. The inlet check valve includes a venting recess. The venting recess allows air to flow past the inlet check valve in the opposite direction of the flow of liquid into the liquid chamber.

主权项

1. A refill unit for a dispenser comprising:
a container for holding a liquid; a pump secured to the container; the pump having a pump chamber; an inlet check valve located upstream of the pump chamber; the inlet check valve having an annular seal; and a venting recess located in the annular seal.
wherein air in the pump chamber may pass through the venting recess in the annular seal and flow into the container.