A metering pump includes an actuating mechanism, and a plurality of piston cylinders
coupled to the actuating mechanism. A first of the cylinders has a working volume
that differs from a second of the cylinders. The actuating member is centrally
located and the cylinders are arranged radially about the actuating mechanism.
The working volume of the cylinders can be varied by adjusting the spacing of the
cylinders from the actuating mechanism, thus varying the stroke of pistons housed
within the cylinders, and/or by providing the cylinders with different inner diameters.
A method of metering fluids includes independently adjusting stroke of a plurality
of pistons to adjust the volume of metered fluid, and selecting different cylinder
diameters to adjust the volume of metered fluid.
