Metering pump with varying piston cylinders, and with independently adjustable piston strokes

A method of metering fluids, comprising:

• independently adjusting stroke of one piston of a plurality of pistons to adjust the volume of metered fluid, each piston being housed within a non-rotating cylinder having a fluid inlet and a metered fluid outlet,
• selecting different cylinder diameters to adjust the volume of metered fluid and actuating the pistons to pump at least two different fluids.

A metering pump, comprising:

• an actuating mechanism, and
• a plurality of non-rotating, fluid-pumping piston cylinders arranged radially about the actuating mechanism and coupled to the actuating mechanism, a first of the cylinders having a working volume that differs from a second of the cylinders, the first and second cylinders being arranged for pumping different fluids,
• wherein a central axis of the first cylinder is spaced from a central axis of the actuating mechanism a distance that differs from a spacing of a central axis of the second cylinder from the central axis of the actuating mechanism.

A metering pump, comprising:

• an actuating mechanism,
• a plurality of piston cylinders arranged radially about the actuating mechanism and coupled to the actuating mechanism, a first of the cylinders having a working volume that differs from a second of the cylinders, and
• an adjustment mechanism configured to independently vary the spacing of one piston cylinder of the plurality of piston cylinders from the actuating mechanism to independently adjust the stroke of a piston in the one piston cylinder.

A metering pump, comprising:

• an actuating mechanism, and
• a plurality of fluid-pumping piston cylinders arranged radially about the actuating mechanism and coupled to the actuating mechanism, the actuating mechanism being between the cylinders, a first of the cylinders having a working volume that differs from a second of the cylinders, the first and second cylinders being arranged for pumping different fluids,
• wherein a central axis of the first cylinder is spaced from a central axis of the actuating mechanism a distance that differs from a spacing of a central axis of the second cylinder from the central axis of the actuating mechanism.