Patent ID: 7434708

Claim:
A pump for viscous fluids comprising: a housing having at least a first opening in communication with a pump cavity, a second discharge opening and a third intake opening in communication with a pump inlet channel, the pump inlet channel in communication with a fluid reservoir, the pump cavity in communication with a cylinder; and a valve member disposed within the housing, the valve member being rotatable about an axis and comprising at least one axial channel extending along or parallel to the axis and communicating with the first opening in the housing, at least two outlet channels extending radially from the axial channel to a circumference of the valve member, and at least one inlet channel radially extending from a circumference of the valve member to the axial channel; wherein a diameter of one of the radially extending outlet channels is smaller than that of the other outlet channel(s) for precision dispensing of the viscous fluid, wherein diameters of the radially extending outlet channels are smaller than diameters of the second opening and the inlet channel, and wherein each of the radially extending outlet channels can be brought in registry with the second opening by rotating the valve member.