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How Does Machine Espresso Work?

The machine espresso is made using precision pressure, and a filtering technology that is amazing to create the coffee you love. How exactly does it work?

Espresso is produced by pushing hot water 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 suggests the group head is the place you put your portafilter in when brewing travel espresso maker (read this blog article from Telegra). It disperses water in the portafilter, and then regulates the pressure during the extraction. There are various kinds of group head, each with their unique advantages and drawbacks. Some are specifically designed for stability of temperature while others are designed to handle pre-infusion. Some are designed to control the lever. Some include a mix of features, such as the E61, which is the most popular choice among baristas due to its ability to offer multiple benefits in one package.

As you can see in the above photo the group head is made up of numerous notches that you can place your portafilter and twist it manually to lock it in. There is also a gasket made of rubber in the notches and helps to create the seal when you insert your portafilter into the machine. The notches on the head permit an exact positioning of the portafilter which is crucial to ensure an efficient extraction.

Aside from allowing you to easily place your portafilter in, the group head is also responsible to maintain an even temperature. It does this by cycling hot water through the brew basket and around the portafilter, ensuring that it is always at the correct temperature to extract. It is crucial to keep in mind that even a small differences can make the distinction between a great and a excellent espresso.

The Pump

Motorized pumps in espresso machines rotary provide nine atmospheric bar pressure required for professional espresso machine extraction. This is different from manual piston machines which use levers. The pressure builds by removing tap water from a reservoir, and pumping it through a heat exchanger prior to being pumped through the ground coffee inside the group head.

Pumps are typically less expensive than piston-driven machines and tend to last longer, although both types of machines may get damaged through overuse and lack of cleaning. They also increase the complexity of mechanical systems that can lead to an expensive price for even the simplest models.

Certain espresso machines remove the pump completely and make use of steam pressure to make espresso. This can cause over-extraction because the boiler that makes steam also heats the water until it comes to a boil. The machines also need to constantly rebuild their pressure between cups. This takes energy and time.

A majority of italian espresso machine machines use a vibration or rotary pump, with a vibrating model using a rotating disc to create pressure and a rotary model pushing hot water through the grounds under high speed. Both machines can make excellent espresso, however rotary machines are more quiet, durable and less likely to fail.

The Boiler

The boiler is the part that heats the water to the ideal temperature to extract. The resultant steam then reaches the portafilter that contains ground espresso beans and is then pumped into the cup. During this process, the steam creates pressure that pushes through the best coffee espresso machine grounds. This creates a layer crema that is then poured over. This is one of the hallmarks of a good espresso.

There are three kinds of espresso makers. They differ in the type of pump they employ and how hot the coffee is. There are various ways that the brew may be controlled as well as the size of the cup that the machine can make.

The first espresso machines were steam-type. They utilized one boiler to make both steam and brew, but the pressure they could produce was very low - just two bars of atmospheric pressure at most. The coffee tasted bitter and burnt. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used retro espresso maker machine is a semiautomatic that has an electric pump. These are the images people have when they think of an espresso machine. Semi-automatic machines require you to grind and tamp your beans yourself The pump, however, regulates the water flow and pressure. This is an excellent compromise between human touch and the mechanized consistency.

The Filter

Espresso machines usually use a filter that separates the coffee grounds from the hot water. The filter is also an important element of the temperature control system since it helps prevent the machine from overheating.

It also aids in flavor, as it can allow for a longer bloom time. This lets the beans release their nuances, and allows for a better extraction.

It is important to keep in mind that even the finest filter can produce a bad cup of coffee. The quality of the beans, and the extraction process, remain crucial.

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

In an espresso machine that is driven by steam, hot water is heated in an airtight tank to produce steam, which is then pushed through the grounds under high pressure. These kinds of machines are typically less expensive and easier 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 years, compressed air pump-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 steam-driven electric espresso machines.