The main goal of this mechanism is to remove gas or air particles from the container which creates a vacuum in the vessel. It can be used for many different purposes and there are many kinds of models for each use. For example, it’s used in electronics manufacturing to make glass coating, semiconducting materials, lamps, electric bulbs and CRT tubes. Some of them are manufactured according to industrial needs so there is a type of everyone.

Models go from the classic vacuum you use at home to much bigger and 100 times stronger. There are numerous businesses where you will need vacuum pump systems so it’s better to understand how they work in order to but the best one for you. Because there are a lot of options to choose from, it may be difficult to find the best option for the right price.

3 Main Types

The first one was used in a laboratory and is responsible for many innovations done in the past. This new invention leads to industrial applications for pharmaceutical processes, automobiles and sewage systems. Based on the technique used, they are divided into entrapment, molecular transfer, rotary vane, liquid ring and positive displacement pumps. When we look at the principles of how they work, 3 main types are positive displacement, momentum transfer and entrapment.

The first type works by using a mechanism that regularly expands a cavity. It also has an outside chamber from where the gases will flow to the cavity. The next process is to seal the hole and release the gas outside. They are mostly used to create low vacuums.

Before sealing off the chamber, momentum transfer VP will use high-speed jets of thick fluid to transfer gas molecules out of the chamber. They are also called molecular pumps and are mostly used to produce high vacuums and can work in combination with displacement types. They are usually much stronger and will be applied for industrial purposes. Entrapment VP will capture molecules in an absorbed or solid state using low temperatures and they include getters, cryopumps and ion pumps. Read more about it here:

Difference between Specifications and Performance

Even dealers and manufacturers tend to place information like flow rates into their catalogs which may be misleading to the buyers. What you should understand is that every model has a certain point or maximum pumping speed also known as free air displacement or flow rate. The more power it generates the speed will steadily decrease because of the resistance it creates.

You will usually compare the specifications of two or more models to check which is stronger but in most cases, the same specifications can differ a lot when it comes to available pumping speed. This means that the flow rate is useless if you want to use it as some kind of measurement of quality. The thing you should focus on is the working flow rate to assure it is efficient and effective.

Manufacturer and Maintenance

Another important thing to mention is the manufacturer which will be the main reason behind the quality of the product. You need to find a reputable seller that has a lot of great reviews and satisfied customers. It isn’t something that will be right around the corner so it’s best to look up online and check how long they have been in the business and what they promote the most.

Besides getting the most popular and expensive model, you need to think about maintenance. These parts usually need lubrication to function properly and they need to be cleaned constantly. The rotary pump is a perfect example because it requires oil to work. The size is mostly connected with maintenance so consider it when making the purchase.

Lubricated or Not

Some people will divide them into those that need to be lubricated and dry VP. Those that need support are more efficient and resilient but require regular maintenance, almost every 12 working hours. You will also need tools to do this which adds to the cost. Everything depends on the industry you are at because you will need to sacrifice efficiency to be able to follow regulations like in the food industry.

Dry VP has to be used in these situations because oil can contaminate the food. Each type has its own pros and cons so always ask a professional for advice. Dry vacuum pumps are more sensitive to high temperatures because they don’t have cooling liquid and are also sensitive to moisture.


Another factor you should consider is choosing a VP based on the chemical used. The product needs to be adaptable to it in order to make the most out of it or to avoid any issues. For example, a rotary type is great with water samples and high boiling point liquids. Diaphragm VP is better with acidic and corrosive samples. Read more on this page.

Liquid ring models are compatible with most cases including vapors, explosive samples, solid particles and liquids. A scroll VP is the best fit for gaseous or liquid samples. Each type has its own uses they are best at so check that first before checking the price and power. The last part would be the price which may vary depending on many factors.

The Cost

You won’t be able to compare the cost between two models if you don’t know all the specifications and applications. We now know that there are numerous types and there is a certain price for each one of them. It can go from a couple of hundred to a few thousand dollars. Usually, oil-based VP is much cheaper than dry ones but this also depends on the quality and specifications.

Plan this out by setting a certain budget and try to find an affordable pump. Look at the maintenance costs because it can increase the value a lot because of the extra care.  A rotary vacuum pump is less expensive than a turbo molecular type but they are also applied differently. The best tip would be to find a professional in your area that can look at your needs and provide the best solution.