The pump core is indeed a critical and precision component within the lotion pumps we use, it is directly determining the quality and user experience of the finished pumps.
How much do you know about the important technical aspects for the pump core ?
Airless Pump Core
1- Definition:
The pump core is the central driving system of a lotion pump. It’s a precision component that uses a mechanical structure to generate negative/positive pressure, enabling the metered dispensing of liquid and ensuring sealed preservation.
It’s technical foundation is the integration of spring mechanics, fluid dynamics, and tribology design in an 8-25mm diameter space,It must also resolve compatibility issues between glass, μέταλλο, πλαστική ύλη, and the contained liquid.
A qualified pump core is required to withstand ≥ 5,000 presses (International Standard ISO 22718)
2- Working principle of the pump core:
1)- Pressing Down
- During depression, the actuator head forces the piston rod down, causing the main spring to compress.
- The piston seal ring then isolates the storage chamber from the atmospheric vent.
2)- Vacuum Action
- The piston’s downward movement expands the pump cavity, resulting in lower internal air pressure compared to the bottle’s internal air pressure.
- The liquid inside the bottle pushes open the bottom valve ball and enters the pump chamber
3)- Liquid Discharge
- Upon release,the main spring returns,pushing the piston upward.
- The Bottom valve ball closes, and the pump chamber volume decreases, creating positive pressure.
- The liquid pushes open the piston valve and is dispensed from the nozzle.
4)- Reset & Sealing
- Upon piston return, the auxiliary spring actuates the seal to close.
- This creates a barrier between the pump cavity and the external environment, guarding against oxidation and evaporation.
