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Professional manufactory of custom hand soap dispenser - Cosyee Houseware

How do different types of pump heads control liquid output?

Understanding Soap Dispenser Pump Head Jams and Leaks: Causes and Solutions

The pump head, as a key component connecting the container and the liquid, not only affects the user's experience but also directly determines the accuracy and stability of liquid output. Different types of pump heads adopt distinct structural designs and working principles to meet the needs of various scenarios such as daily chemicals, medical care, and cosmetics. Let's take a closer look at how they control liquid output.




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1. Press-type pump heads (common in cosmetics and cleaning products)
This is the most widely used type. When you press the top, the piston inside the pump head moves downward, compressing the air or liquid in the pump chamber and pushing the liquid out through the nozzle. When you release the pressure, the spring resets the piston, creating a negative pressure that draws more liquid from the container into the pump chamber for the next use. The output of press-type pump heads is mainly controlled by two factors: the diameter of the piston and the stroke of the press (the distance the piston moves). A larger piston diameter or a longer stroke will result in a larger output per press. For example, the pump head of a shampoo bottle usually has a larger output (3-5ml per press) to ensure sufficient amount for each use, while the pump head of a facial essence may only output 0.5-1ml to avoid waste.
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2. Spray pump heads (used in perfumes, skincare sprays, etc.)
Spray pump heads are a variant of press-type pump heads. The difference is that they are equipped with a nozzle with a fine hole and a "gas-liquid mixing chamber". When pressed, the liquid is ejected at high speed through the fine hole, and is broken into tiny droplets by the air resistance, forming a mist. The output of spray pump heads is not only related to the piston size and stroke but also closely related to the diameter of the nozzle hole. A smaller hole diameter results in finer mist and smaller single output (usually 0.1-0.5ml). For example, perfume spray pump heads pursue a small and uniform output to ensure that a small amount of perfume can cover a large area; while some cleaning sprays may have a larger nozzle hole to increase the output efficiency.

FOR THE REASON

Core principle: The basic logic of pump head output control


No matter what type of pump head it is, its core is to change the internal volume of the pump body through mechanical operation (such as pressing, rotating, or squeezing), thereby forming pressure differences to suck the liquid out of the container. The key to controlling the output lies in three aspects: the size of the internal channel of the pump head, the elasticity of the spring (or elastic component), and the design of the one-way valve. These factors together determine how much liquid is delivered each time the pump is operated.



A jammed soap dispenser pump head means that its internal moving parts, such as pistons, diaphragms, and impellers, cannot operate smoothly. This malfunction can lead to reduced liquid output or even a complete failure of the pump head. Specific symptoms include a heavy or difficult - to - press feel, or the pump head not pressing down at all.




How do different types of pump heads control liquid output? 3
Lotion pump heads (specialized for thick liquids)
Lotion pump heads are designed for thick liquids such as lotions, creams, and hair conditioners. Their internal channel is wider to prevent clogging, and the spring and piston have stronger pressure resistance to push out the viscous liquid. The output control of lotion pump heads mainly depends on the inner diameter of the pump tube and the elasticity of the spring. A larger inner diameter allows more thick liquid to pass through, and a stiffer spring can provide greater pressure, resulting in a larger output. Generally, their single output is 1-3ml, which is suitable for the usage amount of thick products.
How do different types of pump heads control liquid output? 4
Quantitative pump heads (used in medical and scientific fields)
Quantitative pump heads are highly precise and can control the output to a fixed value each time, which is crucial for scenarios that require accurate dosage, such as medical sprays (inhalers) and laboratory reagents. Their core is a mechanical limit structure—a "stopper" is set on the piston or pump rod, which limits the maximum stroke of the piston. No matter how hard you press, the piston can only move to the position of the stopper, thus ensuring that the output is fixed (e.g., 0.05ml or 0.1ml per press). Some high-end quantitative pump heads also use electronic sensors to monitor and adjust the output, achieving higher precision.
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Spray pump heads are a variant of press-type pump heads.
The output of spray pump heads is not only related to the piston size and stroke but also closely related to the diameter of the nozzle hole. A smaller hole diameter results in finer mist and smaller single output (usually 0.1-0.5ml). For example, perfume spray pump heads pursue a small and uniform output to ensure that a small amount of perfume can cover a large area; while some cleaning sprays may have a larger nozzle hole to increase the output efficiency.

Factors affecting the stability of pump head output

Mechanical Wear and Friction:
In addition to the structural design, there are some external factors that will affect the output stability of the pump head
Liquid viscosity
For the same pump head, the output of low-viscosity liquids (such as water, toner) is more stable than that of high-viscosity liquids (such as cream, paste).
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Container pressure
When the liquid in the container is nearly used up, the internal pressure decreases, which may cause the output to decrease. Some pump heads are equipped with a "siphon tube" that extends to the bottom of the container to reduce this impact.
Usage frequency and force
Frequent and violent pressing may cause the spring to fatigue or the one-way valve to fail, resulting in unstable output.

How to choose the right pump head according to output needs?

· For daily chemical products that require convenience and moderate output (such as shampoo, body wash), choose a press-type pump head with adjustable stroke.

· For products that need to be evenly distributed (such as perfume, spray sunscreen), a spray pump head with a small nozzle hole is preferred.

· For thick products (such as lotion, hair mask), a lotion pump head with a wide channel is necessary.

· For products that require accurate dosage (such as medical sprays, essence with active ingredients), quantitative pump heads are indispensable.


Understanding how different pump heads control liquid output can help you better select and use related products. If you have more questions about pump head design or application, feel free to contact us for detailed consultation!

 

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Understanding Soap Dispenser Pump Head Jams and Leaks: Causes and Solutions
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