Buying vacuum pumps and blowers online can be challenging and even a little risky. Buying products that you have not seen for yourself carries the possibility of buying the wrong item, or perhaps worse, being sent a machine that does not work. When distributors live away from you, it often makes them feel that it will be easier for them to take advantage of you, and this is true to some extent. After all, you have a better chance of doing business with a dealer down the street because you don't want to get a bad reputation in the area.

When shopping for vacuum pumps and blowers, one of the first things to do is determine which brand would be the best for you. Sometimes the equipment you need the pump for is more compatible with a certain type, for example. Some of the more popular brands you can start with include: Kinney (now owned by Tuthill), ED, and Gast. These and many other brands have their own websites that you can visit to learn more about their products. They will provide you with essential information on pricing, compatibility, applications, and contact information for recommended sellers.

Because there are so many different types of vacuum pumps and blowers, it is important that you know exactly which one is best suited for the required application. They can be broadly classified into three main groups: positive displacement, momentum transfer (also known as molecular pump), and entrapment pumps.

Vacuum pumps and positive displacement fans use a compartment that is constantly closing, exhausting, and expanding. These are probably the most simplistic of the three main categories, so they are not generally chosen for more important industrial purposes. They maintain a constant pumping speed because the same amount of gas moves during each cycle. The following list contains some examples of this type of pump: rotary vane, diaphragm, liquid ring, piston, screw, wankel, root blower, and lobe.

The next type is impulse transfer, which basically includes 2 different types of pump: diffusion and turbomolecular. This category of pump accelerates gas and molecules from the vacuum side to the exhaust side. They can pump at much higher speeds than other types and can create a very high vacuum. Base pressure is reached when the leak reaches pump speed.

Finally, there is the entrapment type of vacuum pumps and blowers that can be cryogenic pumps, ion pumps, or sorption pumps. Each has different methods of creating a vacuum. For example, the cryopump uses extremely cold temperatures to convert gases into a solid or absorbed state.

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The next type is impulse transfer, which basically includes 2 different types of pump: diffusion and turbomolecular.