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How Does Machine Espresso Work? Machine espresso utilizes precise pressure and incredible filter technology to produce the delicious coffee we enjoy. How does it work exactly? To make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee but the key difference is in the pressure. The Head of the Group As the name implies, the group head is the place you place your portafilter when brewing espresso. It disperses water in the portafilter, and regulates the pressure of extraction. There are several different types of group heads, each with their own advantages and drawbacks. Some are designed to provide stability of temperature while others are designed to handle pre-infusion. Some are designed to control the lever. Some include a combination like the E61. This is a favorite among baristas since it provides multiple benefits in one package. As you can see in the above photo, the group head has many notches in which you can place your portafilter and then twist it with your hands to secure it. There is also a gasket of rubber that resides inside the notches and helps to create an airtight seal after inserting your portafilter into the machine. The notches allow for precise placement of your portafilter. This is vital for an accurate extraction. Apart from allowing click through the up coming web page connect your portafilter, the group head is responsible to ensure that the temperature remains even. It does this by circulating hot water through the brew basket and around the portafilter, ensuring that it's always at the correct temperature to extract. It is important to realize that even a small difference can make the difference between a decent and a great espresso. The Pump The motorized pumps in rotary espresso machines supply the nine atmospheric bar pressure needed for espresso extraction. This is different from manual piston machines that rely on levers. The pressure is built by pumping water through a heat exchanger and then through the ground coffee. Pumps tend to be less expensive and last longer than piston-driven machines. However, both kinds of machines are susceptible to degrading due to excessive use and insufficient cleaning. Pumps are also more complex mechanically, which can raise the cost of even the simple models. Some espresso machines employ steam pressure instead of a pump in order to brew espresso. This can result in over-extraction because the boiler that makes steam also warms the water to boil. The machines must also constantly rebuild their pressure in between cups. This requires energy and time. Many espresso machines make use of the rotary or vibration pump. A vibration model utilizes a rotating disk to generate pressure, whereas a rotary model pushes hot water through the ground at high speed. Both machines can produce excellent espresso but rotary machines are more stable, quieter and less likely to fail. The Boiler The boiler is the element which heats the water to the optimal temperature for extraction. The resultant steam then reaches the portafilter containing the ground espresso and is then pumped down into the cup. The steam creates pressure to push through the coffee grounds. This results in a whipped-up the top of the espresso. This is a sign of a great espresso. There are three kinds of espresso makers. They differ in the type of pump they use and the degree of heat that the espresso is. There are various ways in which the brew could be controlled as well as the dimensions of the cup the maker can create. The first espresso machines were steam-types. They employed one boiler to create both steam and brew, however, the pressure they could produce was not very high – two bars of atmospheric pressure, at most. The coffee tasted bitter and burned. This is why the Milanese makers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine. The most popular espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they imagine these machines. With a semi-automatic machine, you grind the beans and tamp them by hand, but the pump provides regulated water flow and pressure. This is an excellent compromise between human touch and the mechanised consistency. The Filter Typically, espresso machines employ filters to separate the grounds of the coffee as they go through the hot water. The filter is also an essential component of the temperature control system, as it prevents the machine from overheating. A filter also helps with flavor, as it permits a longer flowering phase. This helps the beans release their nuances and gives an opportunity to improve extraction. However, it is important to keep in mind that even a great filter could result in a bad cup of coffee, since the quality of the beans and extraction is still crucial. This is where the magic happens. It's what makes espresso taste good. The grouphead (also called the brewhead) is where you put the portafilter, which is the thingy which you put the grounds of coffee into when making espresso. In the steam-driven espresso machine hot water is heated in an airtight tank to create steam. This then pushes the hot water through the grounds under high pressure. These types of machines are generally less expensive and simpler to maintain than pump-driven models. However, they are limited in their ability to create the ideal brewing conditions, since they operate at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bar. In recent years, compressed air-pump-driven espresso machines have been gaining popularity. They use an air-compressor to force hot water through the ground. They are also more mobile than electric steam-driven espresso machines.