How does lotion pump work?

How a Lotion Pump Works: Step-by-Step Mechanics

1. Priming the Pump

First press: Forces air out of the dip tube and chamber.
Creates initial vacuum needed for suction.

2. Pressing Down (Dispensing Phase)

Actuator pressed: Compresses the spring and pushes the piston downward.
Pressure buildup: Forces liquid from the chamber through the nozzle.
Valve action: Seals the dip tube inlet to prevent backflow.

3. Releasing the Actuator (Suction Phase)

Spring rebounds: Pulls the piston upward, creating vacuum pressure.
Liquid intake: Vacuum opens the inlet valve, drawing new liquid up the dip tube.
Outlet valve closes: Prevents air from entering the nozzle.

4. Sealing & Reset

Piston stabilizes: Returns to neutral position.
Dual-valve lock: Seals both inlet (bottom) and outlet (top) to trap liquid.
Ready state: Chamber refilled; system pressurized for next use.