How Vacuum Pressure and Flow Rate Affect Suction Performance – What You Need to Know?
To meet different usage needs, we have developed a range of DOCTOR’S FRIEND Suction Pump, each with different vacuum pressure and vacuum flow rate specifications. These two indicators are key to understanding how powerful a suction device is.
What is Vacuum Pressure?
Vacuum pressure refers to the maximum level of negative pressure (suction) a device can generate. A higher value means stronger suction power and the ability to get closer to a “perfect vacuum.”
What is Vacuum Flow Rate?
Vacuum flow rate indicates how much air the device can remove per minute. The higher the flow rate, the faster the air is extracted, making it easier to quickly reach and maintain a stable vacuum.
Here’s a comparison between two models as an example:
|
Model |
Max Vacuum Pressure |
Max Vacuum Flow Rate |
|
>650mmHg |
120 L/min |
|
|
>650mmHg |
45 L/min |
Both devices have a maximum vacuum pressure of over 650 mmHg, meaning they can reach about 86.7% vacuum (since atmospheric pressure is around 760 mmHg, 650 ÷ 760 ≈ 0.855). So in terms of how strong the vacuum can get, both models are the same.
However, their vacuum flow rates differ:
• DF-330: 120 L/min
• DF-506K: 45 L/min
This means the DF-330 removes air faster and maintains suction more steadily, making it feel more powerful in use.
Summary
To truly compare the “suction strength” of a device, you need to look at both vacuum pressure and vacuum flow rate:
• Vacuum Pressure shows how strong the suction can be.
• Vacuum Flow Rate shows how quickly and steadily the device can reach and maintain that suction.
Choosing the right model ensures safer, more efficient operation in medical settings.
Article Update: 2025.06.11