Linear pump

A pump for pumping a fluid comprising:

• a housing having a bore disposed in flow communication between a housing inlet and a housing outlet spaced apart at opposite ends of said housing, and a first check valve fixedly joined thereto for controlling flow of said fluid through said housing bore;
• a piston disposed coaxially in said housing bore for axial translation therein, and having a coaxial bore disposed in flow communication between a piston inlet and a piston outlet axially spaced apart at opposite ends of said piston, and a second check valve fixedly jointed thereto for controlling flow of said fluid through said piston bore;
• said piston further including a radially outer surface spaced radially inwardly from said housing bore to define a radial gap therebetween being axially coextensive with said piston bore between said piston inlet and outlet for channeling a portion of said fluid axially therethrough;
• and
• means for axially oscillating said piston in said housing for cyclically pumping said fluid in turn through said housing and piston inlets and outlets in unidirectional flow through said housing and piston bores.