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How Does Machine Espresso Work?

Machine espresso uses precision pressure and incredible filter technology to produce the perfect cup of coffee. What exactly does it work?

In order to make italian espresso machines, hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee. However, the pressure is the main difference.

The Group Head

The name implies, the group head is the place you insert your portafilter when making espresso. It distributes water into the portafilter and controls the pressure of the extraction. There are many different types of group heads, each with its own advantages and disadvantages. Some focus on temperature stability, whereas others on pre-infusion features, and others are designed to control the lever. There are even some that contain a variety of features, like the E61, which is the standard choice for many baristas due to its ability to offer multiple benefits in one package.

As you can see in the above image, the group head has several notches to place your portafilter and twist it manually to secure it. There is also a rubber gasket which is located inside the notches, which helps create an airtight seal after inserting 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 not only allows the portafilter to be inserted easily however, it also keeps a constant temperature. It does this by circulating hot water through the brew pan and around the portafilter to ensure that it is always at the correct temperature to extract. This is important, as even a small difference in temperature can make the difference between good and great espresso.

The Pump

In contrast to manual piston machines which rely on a lever to pressurize water, rotating espresso machines rely upon motorized pumps to supply the nine atmospheric bars of pressure necessary for espresso extraction. This pressure builds up by removing tap water from a reservoir and pumping it through a heat exchanger before being pumped through the ground coffee in the group head.

Pumps are generally more affordable and last longer than piston-driven machines. However, both types of machines may degrade because of excessive use and insufficient cleaning. Pumps are also more complicated mechanically, and can add to the cost of even simpler models.

Certain espresso machines remove the pump completely and make use of steam pressure to make espresso. The drawback of this is that the same boiler that produces steam also raises the temperature of water to the point of boiling which could lead to excessive extraction. They also have to constantly rebuild their pressure between cups. This requires energy and time.

A majority of espresso machines use the rotary or vibration pump, with a vibration model that uses a vibrating disc to create pressure, and rotating models that push hot water through the grounds under high speed. Both types of machines can make excellent espresso, Best home espresso machine (http://gv517.com/home.php?mod=space&uid=506081) but the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the component that heats water to the optimal temperature to extract. The steam created will eventually reach the portafilter, which contains the espresso coffee grounds. It is then poured into the cup. The steam creates pressure that pushes through the grounds of the coffee. This results in a layer crema that is then poured over. This is one of the main characteristics of a good retro espresso machine.

There are three types of espresso makers, which differ in the kind of pump they use and how hot the espresso is. There are various ways to control the amount of brew, as well as the size of cup that can be produced by the machine.

The first espresso machines were steam-type. They employed only one boiler to make both brew and steam, however, the pressure they could create was minimal - two bars of atmospheric pressure, at most. This resulted in the coffee tasting bitter and burnt. The modern travel espresso maker machine was invented by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso maker is a semi-automatic machine with an electric pump. These are the images people have when they think of an espresso maker. Semi-automatic machines require you to grind and tamp the beans by yourself The pump, however, regulates the water flow and pressure. This is a great solution that combines human control with mechanised accuracy.

The Filter

Espresso machines typically use filters that separate the grounds of coffee from hot water. The filter is also an essential component of the temperature control system, since it helps prevent the machine from overheating.

A filter can also help with flavor because it allows for a longer flowering phase. This helps the beans to release their flavors and provides the chance for better extraction.

It is important to keep in mind that even the most efficient filter can make a bad cup of coffee. The quality of the beans, and the extraction process, are still very important.

It's here that the magic occurs. This is the reason why espresso tastes so delicious. The grouphead (also known as the brewhead) is where you place the portafilter, the thingy that you use to put the grounds of your coffee into while making espresso.

Steam-driven espresso machines make use of hot water that is heated in an airtight container to produce steam. The steam then pushes hot water through the grounds of the coffee under pressure. These machines are less expensive and easier for the owner to maintain than pumps-driven models. However, they are limited in their ability to produce the perfect conditions for brewing, since they are only operating at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bars.

In recent years, compressed-air-pump-driven espresso machines have become more popular. They utilize an air compressor to force hot water through the grounds and are much more portable than steam-driven electric machines.