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How Does Machine Espresso Work? The machine espresso makes use of precision pressure, and filtering technology that is amazing to create the coffee you enjoy. How exactly does it work? In order to make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to that of making drip coffee. However the pressure is the major difference. The Head of the Group The name implies, the group head is the place you insert your portafilter when brewing espresso. It disperses water into the portafilter, and then controls the pressure of the extraction. There are a variety of types of group heads each with its particular advantages and drawbacks. Some focus on temperature stability, others on pre-infusion capabilities, while others are designed to control the lever. Some come with a combination of both, like the E61. This is a favorite among baristas due to the fact that it has multiple benefits in one package. As you can see from the picture above, the group head is fitted with several notches. It is possible to place your portafilter inside these notches, and then twist the head to secure it. There is also a gasket made from rubber that is a part of the notches, which helps create a seal when you insert your portafilter into the machine. The notches allow for precise placement of your portafilter. This is essential for an accurate extraction. The group head not only allows the portafilter to be inserted easily however, it also keeps an even temperature. This is done by cycling hot water around the portafilter, and through the brew basin, ensuring the temperature is always right to extract the coffee. This is crucial, since even a few degrees can make the difference between a good and excellent espresso. The Pump In contrast to manual piston machines that use a lever to pressurize water, the rotary espresso machines use motorized pumps to supply the nine atmospheric bars of pressure needed for espresso extraction. The pressure is built by pumping water through a heat-exchanger and then through the ground coffee. Pumps tend to be less expensive than piston-driven models, and they tend to last longer, however both types of machines may become damaged due to excessive use and poor cleaning. They also increase the complexity of mechanical systems which can result in a high price tag on even the simplest models. Some espresso machines use steam pressure instead of a pump for brewing espresso. The disadvantage of this is that the same boiler that produces steam also increases the temperature of water until it reaches boiling and can result in excessive extraction. The machines also need to continuously rebuild their pressure between cups. This requires energy and time. Many espresso machines employ an rotary or vibrating pump, with a vibrating model using a vibrating disc that generates the pressure and a rotary model pushing hot water through the grounds under high speed. Both types of machine are capable of producing excellent espresso, but rotary machines are quieter and more durable than vibration pumps. The Boiler The boiler is used to heat the water to the ideal temperature for extraction. The steam that is produced is then directed to the portafilter, which contains the espresso coffee grounds. The steam is then channeled into the cup. During this process the steam is able to create enough pressure to push the coffee grounds through. This produces a layer of crema on top. This is the hallmark of a great espresso. There are three types of espresso makers, which differ in the type of pump they employ and the degree of heat that the brew is. There are also different ways in which the brew could be controlled and the size of the cup that the machine can produce. The earliest espresso machines were steam type. They had one boiler to make both brew and steam, however the pressure they were able to produce was not very high – two bars of atmospheric pressure at most. This resulted in the coffee tasting bitter and burnt. This is why Milanese makers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine. The most popular espresso machine is a semiautomatic with an electric pump. When people think of espresso machines, they think of these machines. With a semi-automatic machine, you must grind the beans and tamp them by hand. The pump is able to regulate the flow of water and pressure. This is an excellent compromise between human touch and the mechanised accuracy. The Filter Espresso machines usually use a filter that separates the grounds of the coffee from hot water. The filter is also an essential part of the machine's temperature control, since it stops overheating. It also improves flavor as a filter lets you enjoy a longer bloom phase. This lets the beans release their flavor and allows for a better extraction. However it is crucial to keep in mind that even a top filter can result in a poor cup of coffee as the quality of the beans and extraction is still crucial. It's in this area that the magic happens. This is the reason why espresso tastes so good. The grouphead (also known as the brewhead) is where you place the portafilter, which is the thingy used to place the grounds of coffee into when making espresso. Steam-driven espresso machines make use of hot water that is heated inside an airtight container to make steam. The steam then moves hot water through the coffee grounds under high pressure. These machines are less expensive and are easier for the user to maintain than pumps-driven models. click through the up coming post are however limited in their ability to create the ideal conditions for brewing since they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars. In recent years, espresso machines powered by a compressed air pump have become increasingly popular. They utilize an air compressor to force hot water through the ground, and are more mobile than steam-driven electric espresso machines.