There are two common types of pump heads: external spring pumps and internal spring pumps. They differ slightly in structure and operation principle. Here are the differences between them:
Structural differences:
External Spring Pump: In an external spring pump, the spring is located outside the pump head, typically covering the suction tube or pipe above the pump head. When the pump head is pressed down, the spring is compressed, generating pressure to eject the product.
Internal Spring Pump: In an internal spring pump, the spring is located inside the pump head. Its design typically includes a piston, with the spring located below the piston. The product is pumped by the up-and-down movement of the piston.
Application:
External Spring Pump: External spring pumps are suitable for a variety of viscosity liquids and emulsions, including cosmetics, shampoos, body washes, hand soaps, etc.
Internal Spring Pump: Internal spring pumps are suitable for thicker products, such as moisturizing creams, hand creams, lip balms, and hair conditioners.
Anti-Backflow Performance:
External Spring Pump: Due to the position of the external spring, external spring pumps typically have better anti-backflow performance, effectively preventing product backflow and contamination.
Internal Spring Pump: Internal spring pumps may have some backflow when stopped, which is not as accurate and controllable in liquid discharge as external spring pumps.
It is important to note that choosing the appropriate pump head type based on the specific product's needs and usage scenarios is crucial. By considering the product characteristics, user experience, and market demand, selecting the appropriate pump head design can help enhance the product's functionality and competitiveness.
Internal spring pump dispenser
External spring pump dispenser
