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How Does Machine Espresso Work?

The machine espresso is made using precise pressure, as well as a filtering technology that is amazing to make the coffee you love. What exactly is it?

To make an espresso hot water is forced under high end espresso machine 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

As the name implies the group head is where you place your portafilter while brewing espresso. It disperses water into the portafilter, and then regulates the pressure of extraction. There are many different types of group heads, each with its own advantages and disadvantages. Some are designed to provide stability of temperature while others are specifically designed to handle pre-infusion. Some are designed to control the lever. There are some that have a combination of features, like the E61, which is the most popular choice among baristas due to its capacity to offer multiple benefits in a single package.

As you can see in the photo above The group head features several notches where you place your portafilter and twist it manually to lock it in. A rubber gasket is located within the notches to create a seal while you insert your portafilter. The notches on the head allow for an exact placement of the portafilter, which is essential to ensure a consistent extraction.

The group head not only lets you to insert your portafilter easily however it also keeps a constant temperature. It does this by circulating hot water through the brew basket and around the portafilter to ensure that it's always at the right temperature to extract. This is vital, because even a few degrees can mean the difference between good and great espresso.

The Pump

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

Pumps tend to be less expensive and last for longer than piston-driven machines. However, both kinds of machines can degrade because of excessive use and insufficient cleaning. Pumps are also more complicated mechanically, which can raise the cost of even the simple models.

Some espresso machines make use of steam pressure instead of a pump in order to brew espresso capsule machine. This can lead to over-extraction as the dual boiler espresso machine that makes steam also warms the water to boil. They also have to constantly rebuild their pressure between cups. This takes energy and small espresso machine time.

A large majority of espresso machines employ either a vibration or rotary pump. A vibration model utilizes the vibrating disk to create pressure, whereas the circular model pushes hot liquid through the ground at a rapid speed. Both models can produce an excellent espresso, but the rotary pumps are quieter, and more durable than vibration pumps.

The Boiler

The boiler is the part that heats water to the optimal temperature for extraction. The steam produced is then directed to the portafilter, which is a container for espresso grounds. It is then pumped into the cup. The steam generates enough pressure to push the grounds of coffee through. This results in a layer crema that is then poured over. This is one of the main characteristics of a great espresso.

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

The first espresso machines were steam-type. They had only one boiler to make both brew and steam, however the pressure they were able to produce was not very high - two bars of atmospheric pressure at the most. This led to the coffee tasting bitter and burnt. This is the reason why Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most common espresso maker is a semiautomatic machine that has an electric pump. When people think of espresso machines, they envision these machines. With a semi-automatic machine you must grind the beans and then tamp them by hand. The pump regulates the flow of water and pressure. This is an excellent solution that combines human control with mechanized consistency.

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 machine's temperature control, as it prevents overheating.

A filter also helps with flavor because it allows for the beans to flower for a longer period of time. This lets the beans release their nuances, and allows for a better extraction.

However, it is important to remember that even a great filter can produce a bad cup of coffee, since the quality of the beans and extraction is essential.

This is where the magic happens, and it's what makes an espresso really taste great. The grouphead, often referred to as the brewhead, is where the portafilter (the container you place the coffee ground into) is located when you're making espresso.

Steam-driven espresso machines use hot water that is heated inside an airtight container to make steam. The steam then pushes hot water through the grounds of coffee under high pressure. These kinds of machines tend to be cheaper and easier to maintain than pumps-driven models. They are however limited to create the perfect 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 utilize an air compressor to force hot water through the ground. They are also more mobile than electric steam-driven espresso coffee makers machines.