How the 4RB Side Channel Blower Builds Pressure—and Where Its Limits Are

When people first hear how a 4RB side channel blower works, they often imagine something complex.
In reality, the idea is simple—and that simplicity explains both its strengths and its limits.

How the 4RB Gradually Builds Pressure

Pressure is added step by step

Inside a 4RB side channel blower, air doesn’t get compressed all at once.
As the impeller rotates, air moves through the side channel and is accelerated again and again.

Each pass adds a small amount of energy.
Over multiple cycles, pressure slowly builds up.

This is very different from positive displacement machines, where air is trapped and forced into a smaller space in one move.

That’s why 4RB blowers feel smooth and steady in operation.

Non-Contact Design Makes a Big Difference

No friction, no oil, less wear

In a 4RB blower, the impeller never touches the housing.
There is no internal contact and no mechanical compression.

What does that mean in real use?

No oil inside the air path

Very low internal wear

Clean, oil-free airflow

Long service life with minimal maintenance

This friction-free design is one of the main reasons 4RB blowers are trusted for continuous operation.

What the 4RB Does Well

Stable flow matters more than peak pressure

Because pressure is built gradually, the 4RB delivers stable airflow and smooth pressure, even when flow demand changes.

This makes it a strong fit for applications like:

Industrial air supply

Light pneumatic conveying

Vacuum holding and lifting

Packaging and automation lines

If your system needs steady air rather than pressure spikes, this working principle really pays off.

Where the Performance Limit Appears

Knowing what it’s not designed for

That same gradual pressure build also defines the limit.

A 4RB side channel blower is not made for extreme pressure or deep vacuum.
If your application requires high pressure in a small space, a Roots blower or another positive displacement machine is a better choice.

What This Means for Blower Selection

The right tool for the right job

The 4RB is chosen not because it does everything, but because it does specific things very well.

It’s best suited for medium-pressure, medium-flow applications where:

Stability matters

Air must stay clean

Maintenance needs to stay low

Understanding the working principle makes the selection decision much clearer.

ring blower product information

Web: http://www.greentechblower.com  (Group Web)  ‖  http://www.zqblower.cn  (Chinese)  ‖ http://www.ringblower.cn/ (Ring blower)  ‖  http://www.china-blower.com  (Roots Blower)