BigPatents India

A reciprocating pump includes a cylinder with a closed interior compartment. A piston assembly, has a dispensing end and an opposed end. A linear magnetic drive generates a linearly moving magnetic field for moving the piston assembly in opposed linear directions through a swept volume in each of said opposed linear directions, one of said linear directions being suction stroke and the other of said linear directions being a suction stroke. A sealing member is provided between the cylinder and the piston assembly to divide the interior compartment of the cylinder into a dispensing chamber and a reservoir. chamber. A valve-controlled inlet conduit and a valve- controlled outlet conduit are provided. An energy storage and release media communicates with the reservoir chamber for storing energy. The invention also provides a method for pumping liquid.