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How Does Machine Espresso Work? The machine espresso is made using precision pressure, and a filter technology that is mind-blowing to create the coffee you love. What exactly does it work? In order to make espresso hot water is forced under high pressure through finely ground coffee. The process is similar to that of making drip coffee. However, the pressure is the primary difference. The Group Head The group head is the portafilter that is inserted when you are making espresso. It is responsible for dispersing the water into the portafilter and controlling the pressure of the resulting extraction. There are many different kinds of group heads each with its own advantages and drawbacks. Some are designed to provide temperature stability while others are built to handle pre-infusion. Some are designed to control the lever. Some come with a combination of both, like the E61. This is a favorite among baristas because it offers multiple advantages in a single package. As you can see in the above photo, the group head has numerous notches that you can put your portafilter, then twist it manually to secure it. There is also a rubber gasket in the notches, which helps create a seal when you insert your portafilter into the machine. The notches permit an exact placement of the portafilter. This is vital for an accurate extraction. The group head not only lets the portafilter to be inserted easily however it also keeps an even temperature. It does this by circulating hot water through the brew basket, and around the portafilter, ensuring that it's always at the correct temperature for extraction. This is crucial, since even a few degrees can make the difference between excellent and great espresso. The Pump Motorized pumps in rotary espresso machines provide the nine atmospheric bars of pressure required to extract espresso. This is different from manually operated piston machines that employ a lever. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee. Pumps tend to be cheaper than piston-driven machines and tend to last longer, but both types of machines could get damaged through overuse and lack of cleaning. They also make mechanically complex that can lead to a high price tag on even the most basic models. Certain espresso machines eliminate the pump entirely and make use of steam pressure to make espresso. The disadvantage of this is that the same boiler that produces steam also increases the temperature of the water to the point of boiling which can cause excessive extraction. Additionally, these machines frequently have to rebuild their pressure between cups, which takes time and energy. Many espresso machines make use of an rotary or a vibration pump. A vibration model makes use of the vibrating disk to create pressure, while a rotary model pushes hot water through the ground at a rapid speed. Going At this website of machine can make excellent espresso, however Rotary machines are quieter and more durable than vibration pumps. The Boiler The boiler is the one that will heat the water to the ideal temperature for extraction. The resulting steam reaches the portafilter, which contains ground espresso beans and is then pumped down into the cup. During this process, steam creates pressure and pushes through the coffee grounds. This creates a foam on the top of the espresso. This is one of the hallmarks of a good espresso. There are three types of espresso makers, and they differ in the type of pump they employ and how hot the coffee is. There are different ways in which the brew could be controlled and the dimensions of the cup the machine is capable of making. The first espresso machines were steam type. The earliest espresso machines were steam-type machines. This led to the coffee tasting burnt and bitter. This is why the Milanese producers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine. The most well-known espresso machine is a semiautomatic one with an electric pump. When people think of espresso machines, they think of these machines. Semi-automatic machines require you to grind and tamp the beans by yourself, but the pump regulates the water flow and pressure. This is an excellent compromise between human touch and mechanized accuracy. The Filter Espresso machines usually have filters that separate the grounds of coffee from hot water. The filter is also an essential component of the machine's temp control, since it helps to prevent overheating. It also aids in flavor, since a filter allows for a more prolonged bloom time. This allows the beans to let their nuances out, and improves extraction. However, it is important to keep in mind that even a good filter can produce a bad cup of coffee, as the quality of the beans and extraction is still essential. It's in this area that the magic happens. This is what makes espresso taste so delicious. The grouphead (also known as the brewhead) is where you put the portafilter, the thingy used to place the grounds of your coffee into when making espresso. In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam. Steam is then pushed through the grounds at high pressure. These machines are less expensive and easier for the user to maintain than pumps-driven models. They are however limited to create the ideal brewing conditions as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars. In recent times, espresso machines powered by compressed air-pump have become increasingly popular. They use an air compressor to push hot water through the ground and are much more mobile than steam-driven electric espresso machines.