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How Does Machine Espresso Work?

The machine espresso uses precision pressure, and a filtering technology that is amazing to make the coffee you love. But how exactly does it work?

Espresso is made by forcing hot water under pressure through finely ground coffee. The process is similar to making drip coffee. However the pressure is the main difference.

The Head of the Group

The group head is the portafilter that you place in the espresso maker when making it. It is responsible for dispersing water into the portafilter before controlling the pressure of the resulting extraction. There are many different types of group heads each with distinct advantages and drawbacks. Some are designed to provide stability of temperature while others are designed to handle pre-infusion. Others are built to control the lever. Some have a combination, such as the E61. This is a favorite among baristas because it offers multiple advantages in a single package.

As you can see in the image above the head of the group is equipped with several notches. You can place your portafilter in these notches, then twist the head to secure it. A gasket made of rubber is placed inside the notches to help create a seal when you insert your portafilter. The notches allow for an exact placement of the portafilter. This is vital for an efficient extraction.

Apart from allowing you effortlessly insert your portafilter the group head is also responsible for maintaining a consistent temperature. It does this by cycling hot water through the brew container and around the portafilter, making sure that it's always at the correct temperature to extract. This is important because even a few degrees can mean the difference between excellent and great espresso.

The Pump

In contrast to piston machines that are manually operated, which use a lever to pressurize water, Rotary espresso machines rely on motorized pumps that provide the nine atmospheric bars of pressure needed to extract espresso Machines home. The pressure is built by pumping water through a heat exchanger and then through the ground coffee.

Pumps are typically 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 increase the price of even the simpler models.

Certain espresso machines do away with the pump completely and make use of steam pressure to make espresso. This can lead to over-extraction as the boiler that makes steam also causes the water to boil. Additionally these machines are often required to rebuild their pressure between cups, which requires time and energy.

Many espresso machines make use of an rotary or a vibration pump. A vibration model employs an oscillating disk to create pressure, whereas the circular model pushes hot liquid through the ground at a rapid speed. Both models are capable of producing excellent espresso, however rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the one that is used to heat the water to the right temperature for extraction. The steam created will eventually reach the portafilter, which is a container for espresso grounds. The steam is then channeled into the cup. During this process, steam creates pressure and pushes through the grounds of the coffee. This results in a layer of crema that is then poured over. This is a hallmark of a good espresso.

There are three kinds of espresso machines, each with different pumps and brew temperature. There are many ways to control the brew and the size of cup that can be made by the machine.

The earliest espresso machines were steam type. They employed one boiler to create steam and brew, however, the pressure they could produce was not very high - two bars of atmospheric pressure maximum. The coffee tasted bitter and burnt. This is why Milanese producers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most well-known espresso machine is a semiautomatic model 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 yourself The pump, however, regulates the water flow and pressure. This is a fantastic compromise between human control and mechanized consistency.

The Filter

Typically, espresso machines have filters to separate the grounds of coffee as they move through the hot water. The filter is also a vital element of the machine's temperature control, since it helps to prevent overheating.

A filter also helps with flavor, as it permits a longer flowering period. This lets the beans release their nuances, and allows for better extraction.

It is important to remember that even the best espresso machine under 200 filter can produce a bad cup of coffee. The quality of the beans and the extraction process, are still crucial.

It's here that the magic happens. This is what makes espresso taste so delicious. The grouphead (also known as the brewhead) is where you place the portafilter, the thingy used to place the coffee grounds in, when making espresso.

Steam-driven espresso coffee machines for sale machines make use of hot water that is heated in an airtight container to produce steam. The steam then moves hot water through the grounds of coffee at high pressure. They are less expensive and are easier for the user to maintain than pumps-driven models. However, they are not as efficient in their capacity to create the perfect conditions for brewing, 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 become more popular. They use an air-compressor to force hot water through the ground, and are more mobile than electric steam-driven home espresso machine machines.