When you purchase vacuum pumps and blowers online, it can be challenging and even a little risky. Buying products that you have not seen for yourself carries with it the chance of buying the wrong item, or perhaps even worse, being sent a machine that does not work. When dealers live at a distance from you, it often makes them feel like it will be easier for them to take advantage of you, and this is true to a certain extent. After all, you have a better chance of doing business with a dealer that is right down the street from you because he or she doesn't want to get a bad reputation in the area.
When buying vacuum pumps and blowers, one of the first things you should do is determine which brand would be best for you. Sometimes the equipment you need the pump for is more compatible with a certain type for example. A few of the more popular brands that you may want to start with include: Kinney (now owned by Tuthill), ED, and Gast. These and many other brands all have their own web sites that you can visit in order to learn more about their products. They will provide you with essential information regarding price, compatibility, applications, and the contact information of recommended sellers.
Because there are so many different types of vacuum pumps and blowers, it is important that you know exactly the right one for your required application. They can be widely classified into three main groups: positive displacement, momentum transfer (also known as a molecular pump), and entrapment pumps.
Positive displacement vacuum pumps and blowers use a compartment that is constantly being closed off, exhausted, and expanded. These are probably the most simplistic of the three main categories, so they are usually not chosen for larger industrial purposes. They maintain a constant pumping speed because the same amount of gas is moved during each cycle. The following list contains a few examples of this type of pump: rotary vane, diaphragm, liquid ring, piston, screw, wankel, roots blower, and lobe.
The next type is the momentum 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 side of the exhaust. They are able to pump at much higher speeds than other types and can create a very high vacuum. The base pressure is met when leakage meets the speed of the pump.
Finally, there is the entrapment type of vacuum pumps and blowers which can either be cryopumps, ion pumps, or sorption pumps. They each have different methods of creating a vacuum. For example, the cryopump uses extremely cold temperatures to turn gasses into a solid or an absorbed state.
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