Dispensing Pumps
Dispensing pumps are used to dispense a precise amount of liquid from the pump. The amount of dispensed liquid depends on the stroke rate and the amount displaced by the piston during each stroke. Dispensing pumps are used to distribute a variety of liquids, including chemicals, gasoline, and even paint.
Dispensing pumps rely on pressure to move liquids from an area of high pressure to an area of low pressure. A piston that moves in and out of a cylindrical chamber generally creates this pressure. The piston is powered by an electric motor that enables its linear motion.
When the piston leaves the chamber, it becomes a vacuum that lets liquid in from the inlet line. When the piston reenters the chamber, it pressurizes the liquid. Because the liquid cannot be compressed, it must be displaced, leaving through the outlet line. The inlet and outlet lines are fitted with valves so that the fluid can flow in only one direction.
Dispensing pumps can be fitted with computers that allow flow rates and mix ratios to be quickly and easily altered. They can work automatically or can alternately be activated by the push of a button or foot pedal.