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How Does Machine Espresso Work?

Machine espresso makes use of precise pressure and mind-blowing filter technology to make the coffee we love. But how exactly does it work?

To make an espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee, but the difference is in the pressure.

The Head of the Group

The group head is the portafilter that you put in when making espresso. It distributes water into the portafilter, and then controls the pressure of the extraction. There are many different types of group heads each with their own advantages and drawbacks. Some are focused on temperature stability, others on pre-infusion options, and others are designed to control the lever. Some include a combination like the E61. This is a popular choice among baristas since it provides multiple advantages in a single package.

As you can see from the picture above, the group head is fitted with a variety of notches. It is possible to place your portafilter inside these notches, and then twist the head to lock it. There is also a rubber gasket that is a part of the notches, which helps create the seal when you insert your portafilter into the machine. The notches on the head allow for a precise placement of the portafilter, which is necessary to ensure an even extraction.

Aside from allowing you to easily insert your portafilter, the group head is also responsible for maintaining a consistent temperature. This is achieved by cycling hot water around the portafilter, and through the brew-basket, ensuring that the temperature is at the right level for extraction. This is important because even a few degrees can make the difference between a good and excellent espresso.

The Pump

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

Pumps are generally cheaper and last longer than piston-driven machines. However, both types of machines can deteriorate due to excessive use and insufficient cleaning. Pumps are also more complex mechanically, which can raise the cost of even simpler models.

Certain espresso machines eliminate the pump completely and employ steam pressure to create espresso. This can lead to over-extraction as the boiler that makes steam also causes the water to boil. The machines must also continuously rebuild their pressure between cups. This requires energy and time.

A majority of espresso machines use a vibration or rotary pump, which has a vibration model using a vibrating disc to generate the pressure, and a rotary model pushing hot water through the grounds under high speed. Both types of machine can make a great espresso, however the rotary pumps are quieter, and more durable than vibration pumps.

The Boiler

The boiler makes the water warm to a temperature that is ideal to extract. The steam that is produced gets to the portafilter which contains the espresso coffee grounds. It is then pumped into the cup. The steam generates enough pressure to push the grounds of the coffee through. This produces a layer of crema that is then poured over. This is a hallmark of a good espresso.

There are three kinds of espresso makers. They differ in the type of pump they employ and the degree of heat that the brew is. There are a variety of ways to control the amount of brew, as well as the size of the cup that can be made by the machine.

The first espresso machines were steam-types. They employed a single boiler to make steam and brew, however the pressure they were able to produce was not very high - two bars of atmospheric pressure at the most. This resulted in the coffee tasting bitter and burnt. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most well-known espresso maker is a semi-automatic machine that has an electric pump. When people think of espresso machines, they envision these machines. With a semi-automatic machine you have to grind the beans and then tamp them by hand. However, the pump regulates the flow of water and pressure. This is an excellent compromise between human control and mechanized reliability.

The Filter

Espresso machines usually have a filter that separates the grounds of coffee from hot water. The filter is also a vital component of the temperature control system since it helps prevent the machine from overheating.

Filters also aid in flavor, as it permits the beans to flower for a longer period of time. This lets the beans release their flavors, and allows for a better extraction.

It is important to keep in mind that even the finest filter could result in a poor cup of coffee. The quality of the beans, and the extraction, remain vital.

This is where the magic happens, it's what makes professional espresso maker taste good. The grouphead (also known as the brewhead) is where you put the portafilter, the thingy that you put the coffee grounds into, when making decent espresso machine.

In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam. Steam then pushes the hot water through the grounds under high pressure. These kinds of machines tend to be less expensive and simpler to maintain than pump-driven models. However, they are limited in their ability to create the ideal conditions for brewing since they are only operating at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bar.

In recent years, compressed air pump-driven espresso maker for home coffee machines uk - visit Migration Bt 4 here >>, machines have been gaining popularity. They use an air compressor to push hot water through the grounds and are more portable than electric steam-driven machines.