Mainly talk to you about the differences between the external pump and the built-in pump involved in the nozzle and pump head we often talk about.
External pump: for nozzles and pump heads, we should all know that springs need to be placed inside the product center. For external pumps, that is, the springs in the center of nozzles / pump heads are externally visible. They are generally placed above the pump core, and the assembly is directly connected to the nozzle / pump head cap. The advantage of the external pump is that it does not directly contact with the liquid in the bottle, which is not only environmentally friendly and hygienic, but also 100 percent avoid the rust of individual springs and affect the product quality in the bottle. Of course, this problem is rare, because most springs are treated. In addition, the force of the external pump is larger than that of the built-in pump, so the external pump of the general pump head is more suitable for the thicker liquid of the emulsion raw liquid.
Built in pump: opposite to the external pump, the built-in pump, that is, the sprayer / pump center, is not visible in the center. It is usually located in the middle position of the pump body. The internal spring can be directly contacted with the liquid. It is slightly smaller than the external pump according to the pressure channel, and is generally used for health products, essential oils, perfume and skin care water.
