The working principle of the lotion pump head is simple. By manually pressing the dynamic pressure handle downward, the volume in the spring cavity decreases, the pressure increases, the liquid enters the nozzle cavity through the hole of the valve core, and then the liquid is sprayed out through the nozzle. At this time, the pressure handle is released, and the spring cavity The volume of the valve increases, forming a negative pressure, the ball is opened under the action of negative pressure, and the liquid in the bottle sealing ring enters the spring cavity. At this time, there is a certain amount of liquid in the valve body. When the handle is pressed again, the liquid stored in the valve body The liquid will rush upward and spray out through the nozzle.

    When we choose a pump head, the key is to pay special attention to the following points:

    1. The glass beads or steel balls under the spring, the sealing here is very important, which is related to the upward force of the liquid in the spring cavity. If there is leakage here, when the pressing handle is pressed, part of the liquid will leak into the bottle. And affect the effect of liquid to spray.

    2. It is the sealing ring at the upper end of the valve body. If there is leakage here, when the pressure handle is released, the upward force of the liquid to be pumped will decrease, resulting in a small amount of liquid stored in the valve body, which will also affect the spray effect.
    3. The cooperation between the pressure handle and the valve core, if the fit here is loose and there is leakage when the liquid rushes up to the nozzle, there will be a certain resistance of glass beads or steel balls, and the liquid will flow back, if it leaks here will affect the spray effect.

    4. The design of the nozzle. The quality of the nozzle design is directly related to the effect of the spray. For details, please refer to the next page to explain the design of the nozzle in detail; so the function of the general pump head also detects these four positions, and other appearances and matching problems are all routinely detected.