An apparatus for delivery of fluids to a patient includes an inlet tube (102) and an outlet tube (104) connected to each other at an angular joint. A rotary valve (108) and a piston (122) are fitted to the angular joint forming a chamber (120). The rotary valve (108) is provided with a wedge shaped opening (112) and a priming tubule (114). For priming operation with the fluid delivery apparatus, a user sets the rotary valve to a priming position. During pumping operation, the rotary valve rotates in coordination with the piston (122) to transfer a quantum of fluid from the inlet tube (102) to the outlet tube (104) via the chambe (120)r. A second piston (402) is provided on the outlet tube (104) for smoothing out flow rate pulsations.
