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How Does Machine Espresso Work?

The machine espresso is made using precise pressure and filter technology that is mind-blowing to make the coffee you enjoy. How exactly does it work?

Espresso is created by forcing hot water at high pressure through finely ground coffee. The process is similar to that of making drip coffee. However the pressure is the major difference.

The Head of the Group

The group head is the portafilter that you put in when making espresso. It is responsible for dispersing the water into the portafilter and controlling the pressure of the resulting extraction. There are many different types of group heads, each with its own advantages and drawbacks. Some are designed to provide the stability of temperature while some are designed to handle pre-infusion. Others are made to control the lever. Some have a combination, like 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 photo above The group head features many notches in which you can place your portafilter and then twist it manually to lock it in. There is also a rubber gasket that is a part of the notches to help create an airtight seal when you insert your portafilter into the machine. The notches allow for the precise placement of the portafilter. This is crucial for an accurate extraction.

The group head not only allows you to place your portafilter easily however, it also keeps the same temperature. It does this by circulating hot water through the brew basket, and around the portafilter to ensure that it is always at the right temperature for extraction. This is important because just a few degrees could make the difference between good and excellent espresso.

The Pump

The motorized pumps that are used in rotary professional espresso maker machines supply the nine atmospheric bar pressure needed for espresso extraction. This differs from manual piston machines which use a lever. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are typically cheaper and last longer than piston-driven machines. However, both types of machines may degrade due to excessive use and poor cleaning. Pumps are also more complicated mechanically, which could increase the cost of even the simplest models.

Certain espresso machines can eliminate the pump completely and instead employ steam pressure to create Decent espresso machine. The disadvantage of this is that the boiler that produces steam also raises the temperature of water to the point of boiling which can cause excessive extraction. Additionally these machines are often required to rebuild their pressure between cups, which requires time and energy.

Many espresso machines make use of either a rotary or vibration pump, with a vibration model using a vibrating disc to create the pressure, and rotating models that push hot water through the grounds under high speed. Both machines can make great espresso, but rotary machines are quieter, more durable and less likely to break.

The Boiler

The boiler makes the water warm to the ideal temperature to extract. The resulting steam reaches the portafilter containing the ground espresso coffee and is then pumped into the cup. The steam causes enough pressure to push the grounds of the coffee through. This results in a layer crema on top espresso machines. This is one of the hallmarks of a great espresso.

There are three different types of espresso machines, each with different pumps and the temperature of the brew. There are different ways to control the brew as well as the size of the cup that can be produced by the machine.

The first espresso machines were steam-types. They employed only one boiler to make steam and brew, however, the pressure they could generate was low - only two bars of atmospheric pressure, at most. The coffee tasted bitter and burned. The modern espresso machine was invented by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most well-known espresso machine is a semiautomatic with an electric pump. When people think of espresso machines, they picture these machines. Semi-automatic machines require you to grind and tamp the beans yourself while the pump controls the water flow and pressure. This is an excellent compromise between human touch and the mechanised quality.

The Filter

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

It also improves flavor, since a filter allows for a more prolonged bloom time. This allows the beans to release their flavors, and allows for better extraction.

It is important to remember that even the most efficient filter could result in a poor cup of coffee. The quality of the beans, and the extraction, are still very important.

It's here that the magic happens. This is the reason why espresso machine sale tastes so good. The grouphead (also known as the brewhead) is where you place the portafilter, the device used to place the coffee grounds into, when making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight container to produce steam, which is then pushed through the grounds at a high pressure. These machines are less expensive and easier to maintain than pumps-driven models. However, they are limited in their capacity to create the ideal conditions for brewing as they only operate at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bar.

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