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How Does Machine Espresso Work?

The machine espresso utilizes precise pressure, as well as a filtering system that is awe-inspiring to create the coffee you enjoy. But how exactly does it work?





To make an espresso hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee. However the pressure is the major difference.

The Group Head

As the name suggests the group head is where you put your portafilter in when making espresso. It is responsible for dispersing water into the portafilter, and controlling the pressure of the resulting extraction. There are various kinds of group heads, each with their own advantages and drawbacks. Some are designed to provide stability of temperature while others are built to handle pre-infusion. Some are designed to control the lever. espresso machines uk come with a combination of both, like the E61. This is a very popular choice for baristas as it provides a variety of benefits in one package.

As you can see in the photo above the group head comes with many notches in which you can put your portafilter, then twist it with your hands to lock it in. There is also a gasket made from rubber that is a part of the notches to help create an airtight seal after inserting your portafilter into the machine. The notches on the head allow for a precise position of the portafilter which is crucial to ensure an even extraction.

Apart from allowing you easily connect your portafilter, the group head is responsible to maintain an even temperature. This is achieved by cycling hot water around the portafilter, and through the brew-basket, making sure that the temperature is always at the right level for extraction. It is crucial to keep in mind that even a slight difference can make the difference between a good and great espresso.

The Pump

The motorized pumps in espresso machines that rotate provide the nine atmospheric bar pressure that is required for espresso extraction. This differs from manual piston machines that rely on levers. This pressure builds up by removing tap water from a reservoir and pumping it through a heat exchanger prior to being pushed through the ground coffee in the group head.

Pumps are generally less expensive than piston-driven machines, and they tend to last longer, but both types of machines can degrade with overuse and insufficient cleaning. They also create mechanical complexity, which can result in an expensive price for even the simplest models.

Certain espresso machines eliminate the pump entirely and make use of steam pressure to make espresso. This can lead to over-extraction as the boiler that makes steam also causes the water to boil. They also have to continuously rebuild their pressure between cups. This requires energy and time.

Many espresso machines employ an rotary or vibrating pump, which is a vibration model using a rotating disc to create pressure and the rotary model pushing hot water through the grounds under high speed. Both models can make excellent espresso, but the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the part that heats water to an optimal temperature for extraction. The resulting steam is then transferred to the portafilter, which contains ground espresso beans and is then pumped down into the cup. The steam causes enough pressure to push the grounds of the coffee through. This results in a layer crema that is then poured over. This is one of the hallmarks of a good espresso.

There are three types of espresso makers. They differ in the type of pump they employ and the degree of heat that the brew is. There are various ways to control the brew and the size of the cup that can be produced by the machine.

The first espresso machines were steam-types. The first espresso machines were steam types. This led to the coffee tasting bitter and burnt. The modern espresso machine was designed by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most well-known espresso maker is a semi-automatic device with an electric pump. These are what people imagine when they imagine an espresso machine. Semi-automatic machines require you to grind and tamp your beans yourself however the pump controls the water flow and pressure. This is an excellent compromise between human touch and the mechanised consistency.

The Filter

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

It also helps with flavor, as a filter allows for a longer bloom time. This allows the beans to release their flavor and gives an opportunity for better extraction.

However, it is important to keep in mind that even a top filter could result in a bad cup of coffee, since the quality of the beans and extraction is vital.

It's here that the magic occurs. This is what makes espresso taste so good. The grouphead, sometimes called the brew head, is where the portafilter (the thingy you put the coffee ground into) is placed when you're making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight container to produce steam, which then pushes the hot water through the grounds under high pressure. They are less expensive and easier for the owner to maintain than pumps-driven models. However, they are limited in their capacity to create 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, espresso machines driven by a compressed air compressor have become increasingly popular. They use an air-compressor to push hot water through the ground, and are more mobile than electric steam-driven espresso machines.