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How Does Machine Espresso Work?

Machine espresso employs precise pressure and mind-blowing filter technology to make the perfect cup of coffee. What exactly is it?

best espresso machine is produced by pushing hot water under pressure through finely ground coffee. The process is similar to that of making drip coffee. However the pressure is the primary difference.

The Head of the Group

The name implies, the group head is where you place your portafilter when making travel espresso maker. It disperses water into the portafilter, and then regulates the pressure of extraction. There are many different types of group heads each with their own advantages and drawbacks. Some are specifically designed for the stability of temperature while some are specifically designed to handle pre-infusion. Others are made to control the lever. There are also some that have a combination of features, such as the E61, which is considered the standard choice for many baristas due to its capacity to offer multiple perks in a single package.

As you can see in the above photo the group head comes with many notches in which you can place your portafilter and then twist it with your hands to lock it in. There is also a gasket made of rubber in the notches to help create a seal when you insert your portafilter into the machine. The notches allow for precise placement of your portafilter. This is vital for an accurate extraction.

Aside from allowing you to effortlessly insert your portafilter the group head is responsible for maintaining a consistent temperature. This is done by cycling hot water around the portafilter and through the brew-basket to ensure that the temperature is at the right level to extract the coffee. This is crucial, since even a few degrees can make the difference between good and excellent espresso.

The Pump

In contrast to piston machines that are manually operated, which rely on a lever that pressurize water, rotating espresso machines rely upon motorized pumps that provide the nine atmospheric bars of pressure required for espresso extraction. The pressure builds by drawing tap water from a reservoir and pumping it through a heat exchanger prior to being pushed through the ground coffee inside the group head.

Pumps are generally less expensive than piston-driven models, and they tend to last longer, but both types of machine can become damaged due to excessive use and poor cleaning. They also make mechanically complex and can lead to costly prices for even the most basic models.

Some espresso machines make use of steam pressure instead of a pump to brew espresso machine sale. This could lead to over-extraction since the boiler that produces steam also heats the water until it comes to a boil. In addition these machines typically have to rebuild their pressure between cups, which requires time and energy.

A large majority of espresso machines employ either a vibration or rotary pump. A vibration model makes use of an oscillating disk to create pressure, whereas the rotary model pushes hot water through the ground at a fast speed. Both machines can produce excellent espresso, however rotary machines are quieter, more durable and less likely to fail.

The Boiler

The boiler will heat the water to a temperature that is ideal for extraction. The steam produced gets to the portafilter which holds the espresso grounds. It is then poured into the cup. The steam creates pressure to push through the coffee grounds. This results in a crema on top espresso machines of the espresso. This is the hallmark of a great espresso.

There are three types of espresso machines, each having distinct pumps and brew temperature. There are a variety of ways in which the brew could be controlled, as well as the size of the cup that the machine is capable of making.

The first espresso machines were steam-type. They used a single boiler to make steam and brew, however the pressure they were able to create was minimal - two bars of atmospheric pressure, at most. The coffee tasted bitter and burned. This is why Milanese makers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso coffee machine machine.

The most common espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they envision these machines. 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 quality.

The Filter

Espresso machines usually have filters that separate the grounds of the coffee from the hot water. The filter is also a vital component of the temperature control system as it keeps the machine from overheating.

A filter also helps with flavor because it allows for a longer flowering phase. This lets the beans release their flavor and allows for a better extraction.

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

This is where the magic happens. It's what makes espresso taste good. The grouphead, also called the brewhead, is where the portafilter (the container you place the ground coffee in) is placed when you're making espresso.

Steam-driven espresso machines use hot water heated in an airtight container to produce steam. The steam then pushes hot water through grounds of the coffee under pressure. These machines 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 since they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

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