Liquid dispenser pump

1. A refill unit for a liquid dispenser system, the refill unit comprising:

a liquid container for holding a supply of liquid; and

a pump connected to the liquid container,

the pump comprising a fitment portion and a pump portion,

wherein the fitment portion is configured for attachment to the liquid container, and the pump portion comprises an upper valve member and a lower valve member disposed along a common longitudinal axis;

wherein the fitment portion and the pump portion are formed as one integral piece;

wherein the substantially all of the pumping action occurs when the pump portion extends and contracts lengthwise along the longitudinal axis to pump liquid;

wherein the upper valve and the lower valve are connected to each other by a resilient member.

2. The refill unit of claim 1 wherein the pump portion comprises a bellows.

3. The refill unit of claim 1 wherein the upper valve and the lower valve are formed of one integral piece.

4. The refill unit of claim 1 wherein the upper valve and the lower valve are separate pieces but are connected to each other.

5. The refill unit of claim 1 further comprising an outlet cap.

6. The refill unit of claim 1 wherein the liquid container is in the form of a plastic bag.

7. The refill unit of claim 1 wherein the fitment further comprises one or more locking tabs.

8. A pump comprising:

a unitary pump body including a fitment portion and a bellows portion;

a substantially straight passage extending through the pump body;

the passage having a proximal inlet end near the fitment portion and a distal outlet end opposite the fitment portion; and

an inlet valve located near the proximal inlet end and an outlet valve located near the distal outlet end;

wherein the inlet valve and the outlet valve extend along a common longitudinal axis;

wherein substantially all of the pumping action occurs when the pump body extends and contracts lengthwise along the longitudinal axis to pump liquid; and

wherein the inlet valve and the outlet valve are joined to one another by a resilient member.

9. The pump of claim 8 wherein the inlet valve and the outlet valve are connected to each other.

10. The pump of claim 8 further comprising a container secured to the pump.

11. The pump of claim 8 further comprising a valve cap, wherein the valve cap, the inlet valve and the outlet valve are linked together.

12. The pump of claim 8 wherein the inlet valve and outlet valve are joined together by one or more pieces.

13. A refill unit comprising:

a container;

a unitary pump body including a fitment portion and a bellows portion;

the fitment portion connected to the container;

a substantially straight channel extending through the pump body;

a valve stem located at least partially within the substantially straight channel; and

the valve stem including an inlet valve member, an outlet valve member, and a stem connecting the inlet valve member to the outlet valve member; and

wherein substantially all of the pumping action occurs when the unitary pump body extends and contracts lengthwise along the longitudinal axis to pump liquid.

14. The refill unit of claim 13 wherein the stem is a resilient member.

15. The refill unit of claim 13 wherein the stem is formed of two or more pieces.

16. The refill unit of claim 13 further comprising one or more apertures in the valve cap for fluid to flow through.

17. The refill unit of claim 13 further comprising an intermediary chamber located between the valve cap and the upper valve member.