How To Create A Vacuum With Compressed Air

How To Create A Vacuum With Compressed Air

It may appear strange, but compressed air may be used to create a vacuum. Vacuum eductors, also known as ejectors or venturi, employ a flow of compressed air via a specific nozzle to generate vacuum without the need of a mechanical vacuum pump. 

Because there are no moving components in the simplest form of the process, it is extremely dependable. It is also highly energy demanding; a vacuum venturi, like other compressed air powered devices, uses around ten times the power of a mechanical vacuum pump for the same flow rating. This is not the generator’s problem, but rather a reflection of compressed air inefficiency.

 Making A Vacuum With Compressed Air

Some of the discoveries may also be utilised to construct a basic but effective vacuum pump. Although there are many multiple kinds of vacuum pumps (learn about Magdeburg Hemispheres and how to construct one), the Venturi-effect pump is without a doubt the most basic.

In this episode of Remaking History, you’ll learn how to build a venturi-based vacuum pump for around $25. Vacuum pumps are fantastic science equipment that may be used in a number of intriguing experiments.

Tread Cautiously A Vacuum With Compressed Air

To accelerate the air through the venturi, you’ll need an air compressor, and high-pressure air must be handled with care. Wear protective eyewear and follow the manufacturer’s instructions when using your compressor.

When a vacuum is drawn in a container, atmospheric pressure may cause it to collapse. That’s really impressive for plastic beverage bottles. It’s not so excellent for other stuff. If you’re going to use your pump on a glass flask or container, be sure it’s powerful enough to manage an atmospheric vacuum.

  • Take Out The Tee Fitting

Remove the vacuum module from the plastic casing of the pump. Begin by removing the male air connector with an adjustable wrench, then the tee fitting from the brass nipple.

  • Take Out The Housing

To open the plastic casing, use a screwdriver. Remove and discard the housing.

  • Repaint The Structure

Reconnect the tee connection and the industrial air connector to the venturi module. To avoid leaks, apply thread compound to the threads and tighten them down.

  • Wrap And Fasten

Work one extremity of the 14-inch soft plastic tubing gently over the shorter of the screw threaded fittings connected to the pipe nipple. Cap the bigger fitting securely with the supplied cap.

  • Attach The Hose Barb

Insert the hose barb into the soft tubing’s opposite end.

Operation Of The System To Create A Vacuum With Compressed Air

Connect your air line to the pump’s air intake to start it up. Set your air compressor’s discharge pressure to between 70 and 90 psi. The greater the pressure, the greater the vacuum drawn by your pump. I obtained a vacuum of about 24′′ of mercury (inHg) at 90psi, which is comparable to 11.79psi or 0.8 atmospheres. That’s a lot of information.

Have Some Fun With A Vacuum Pump

What are you going to do with your vacuum pump? Science! Drill a hole in the cap of a plastic soda bottle and insert the hose barb while the pump is operating for the simplest experiment. It’s strangely pleasant to collapse bottles and then watch them re-form when the vacuum is gone.

Another simple method is to stuff a few marshmallows or a dab of shaving cream into a vacuum-capable flask or jar. Pull out a vacuum and see what happens to the contents when they are released from surface pressure.

Placing a buzzer inside a container and then evacuating it is a traditional experiment. Because sound waves cannot propagate in a vacuum, the buzzer will become quiet or almost so.

Using Compressed Air To Create A Vacuum

In a nutshell, vacuum generators employ compressed air to provide a source of vacuum forces using a mechanism known as a venturi. The venturi effect is the total drop in fluid pressure that occurs when a specific fluid passes through a link’s choke.

The fluid in issue in this situation is often the same air that originates from a compressed air-driven system and is forced through it as a consequence of a compressor’s operations. In this scenario, the choke is a restricted portion of airline or pipe, similar to what you’d expect from any other piece of pneumatic equipment.


Vacuum pumps powered by compressed air, on the other hand, work on the Bernoulli Principle. Stress and speed have a constant connection, with a high-velocity fluid producing low pressure. Compressed air is forced through an aperture or nozzle by air-driven pumps, increasing velocity and decreasing air pressure. Elevated air air from outside the apparatus rushes into the generator through channels, attempting to achieve balance. This outside air combines with the high-speed air needed to create low pressure, and the resulting mixture leaves through the exhaust. Protection Status
DMCA Protected & Monitored

There are affiliate links in this post. At no cost to you, I get commissions for purchases made through links in this post.