A lotion pump is a mechanical dispensing device designed to draw a liquid product (like lotion, cream, serum, or soap) from a bottle or container and dispense it in a controlled, measured amount with each press of the actuator (the head you push down on). It is a type of airless pump that creates a vacuum to operate without the need for propellants.
A standard lotion pump consists of several intricate parts that work together:
Actuator: The button you press down on. It often has a dispensing nozzle or opening.
Closure (or Cap): The threaded piece that screws onto the bottle's neck, securing the entire pump assembly.
Outer Cap / Collar: The decorative piece that often covers the closure and provides a finished look.
Dip Tube: A long tube that extends to the bottom of the bottle, drawing the product up into the pump mechanism.
Piston Chamber / Housing: The main body of the pump where the internal mechanics are housed.
Piston: Moves up and down within the chamber, creating suction and pressure.
Spring: Returns the actuator to its upright position after being pressed.
Ball Valve (or other check valve): A small ball that seals the chamber on the upstroke, creating the vacuum and preventing product from flowing back into the bottle.
Gasket: Provides an airtight seal between the closure and the bottle neck, preventing leaks.