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How Does Machine Espresso Work?

The machine professional espresso machine for home, the-Good.kr, uses precision pressure, and a filtering technology that is amazing to make the coffee you enjoy. What exactly is it?

In order to make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee but the major difference is in the pressure.

The Group Head

The name implies the group head is the place you place your portafilter while making espresso. It disperses water into the portafilter, and regulates the pressure during the extraction. There are numerous kinds of group heads, each with its own advantages and disadvantages. Some are specifically designed for stability of temperature while others are built to handle pre-infusion. Some are designed to control the lever. Some come with a combination of both, such as the E61. This is a very popular choice for baristas due to the fact that it has multiple benefits in a single package.

As you can see in the above image, the group head has numerous notches that you can put your portafilter, then twist it with your hands to lock it in. There is also a gasket of rubber that resides inside the notches to help create an airtight seal when you insert your portafilter into the machine. The notches on the head allow for an exact position of the portafilter which is essential for an efficient extraction.

The group head does not just allow the portafilter to be inserted easily however it also keeps an even temperature. It does this by cycling hot water through the brew basket and around the portafilter, making sure that it is always at the right temperature for extraction. It is important to realize that even a tiny differences can make the distinction between a good and great espresso.

The Pump

The motorized pumps used in espresso machines that rotate provide the nine atmospheric bar pressure needed to extract espresso. This is different from manually operated piston machines that employ levers. This pressure is generated by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are typically less expensive than piston-driven models, and they tend to last longer, however both types of machines could get damaged through overuse and lack of cleaning. They also increase the complexity of mechanical systems and can lead to a high price tag on even the simplest models.

Certain espresso machines eliminate the pump completely and utilize steam pressure to make espresso. This can lead to over-extraction as the boiler that makes steam also heats the water to boil. In addition, these machines frequently have to rebuild their pressure between cups, which takes time and energy.

Many espresso machines utilize an rotary or vibrating pump, with a vibrating model that uses a vibrating disc to create pressure, and the rotary model pushing hot water through the grounds at high speed. Both machines can make excellent espresso, however rotary machines are more stable, quieter and less likely to break down.

The Boiler

The boiler is what is used to heat the water to the perfect temperature to extract. The steam that is produced will eventually reach the portafilter, which contains the espresso coffee machines espresso grounds. It is then pumped into the cup. During this process the steam creates enough pressure to push the coffee grounds through. This produces a layer of crema that is then poured over. This is a hallmark of a great espresso.

There are three types of espresso makers, which differ in the kind of pump they use and the degree of heat that the brew is. There are a variety of ways to control the brew and the size of cup that can be made by the machine.

The first espresso machines were steam-type. They employed a single boiler to make steam and brew, but the pressure they could create was minimal - two bars of atmospheric pressure at the most. This resulted in the coffee for espresso machine tasting burnt and bitter. The modern espresso machine was invented by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most common espresso maker is a semi-automatic machine that has an electric pump. When people think of espresso machines, they imagine these machines. Semi-automatic machines require you to grind and tamp the beans yourself The pump, however, regulates the flow of water and pressure. This is an excellent compromise between human touch and the mechanised accuracy.

The Filter

Espresso machines usually have a filter that separates the grounds of the coffee from hot water. The filter is also an essential part of the temperature control system, as it prevents the machine from overheating.

A filter can also help with flavor, as it permits the beans to flower for a longer period of time. This allows the beans to let their nuances out and provides the chance for better extraction.

However, it is important to remember that even a good filter could result in a bad cup of coffee, because the quality of the beans and extraction are crucial.

It's here that the magic occurs. This is what makes espresso taste so good. The grouphead (also known as the brewhead) is where you put the portafilter, the thingy that you put the grounds of your coffee into when making espresso.

In a steam-driven espresso machine hot water is heated in an airtight container to create steam. This is then pushed through the grounds with high pressure. They are less expensive and easier for the owner to maintain than pumps-driven models. They are however limited in their ability for creating the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9 bar espresso machine-10 bars.

In recent years, compressed air-driven espresso machines have become more popular. They use an air compressor to force hot water into the ground and are much more mobile than electric steam-driven espresso machines.