Pump Dispensers
Most common pump dispensers are basically comprised of a dip tube, a pump body, or tank, a piston, a stainless steel spring, and an actuator placed inside a rigid container. In addition, there may be one or two check balls to prevent liquid from flowing out of the pump body back into the container, and from flowing back into the pump body from the piston and actuator. When the actuator is depressed to dispense the product, the pressure in the tank is increased, causing liquid to flow through orifices in the piston and out through the orifice in the actuator.