Apparatus and method for pulsed dispensing of liquid

A method of dispensing controlled amounts of liquid from a syringe dispenser, comprising:

• coupling a supply of pressurized actuation air to a syringe body structure through an input passage;
• supplying a first timed pulse of the actuation air at a first flow rate through the input passage and against a piston mounted for movement in the syringe body structure, to thereby expel a first amount of the liquid through an exit;
• using an air input flow rate controller positioned at the syringe to increase the flow rate from the first flow rate to a second flow rate in accordance with a relationship depending at least partially on a reduction of liquid volume in the syringe body structure;
• and
• supplying a second timed pulse of the actuation air through the input passage at the second flow rate and against the piston to thereby expel a second amount of the liquid through the exit passage,
• wherein using the air input flow rate controller further comprises moving a plunger through the input passage at the syringe body structure to enlarge a cross sectional area of the input passage, the plunger being coupled to the piston such that movement of the piston against the liquid to thereby expel an amount of the liquid automatically causes movement of the plunger, thereby automatically enlarging the cross sectional area of the input passage.