Press the handle by hand, the volume of the spring chamber decreases, the pressure rises, the liquid enters the nozzle chamber through the hole of the valve body of the lotion pump head, and the liquid is sprayed out through the nozzle. At this time, after the handle is released, the volume of the spring chamber increases, forming Negative pressure, the sphere opens under the action of negative pressure, and the liquid in the bottle enters the spring chamber. At this time, there is already a certain amount of liquid in the valve body. When the handle is pressed again, the liquid stored in the valve body is ejected upward.

From the above working principle, the key to a good lotion pump head is to pay special attention to the following aspects:

1. The glass ball or steel ball under the spring. The sealing here is very important, which is related to the upward force of the liquid in the spring chamber. If it leaks from here, part of the liquid will leak into the bottle when the handle is pressed, which will affect the spraying of the liquid. effect.

2. If there is a leak on the sealing ring at the upper end of the valve body of the lotion pump, the force of the liquid pulling upwards when it leaves the handle will be reduced, and the amount of liquid stored in the valve body will be small, which will also affect the spray effect.

3. If the coupling between the joystick of the lotion pump and the valve body is loose and there is leakage, the liquid will have a certain resistance when it rises to the nozzle, causing the liquid to flow backward. If it leaks from here, it will also affect the spray effect.