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How Does Machine Espresso Work?

The machine espresso makes use of precise pressure and filter technology 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 Head of the Group

The group head is the portafilter you place in the espresso maker when making it. It is responsible for dispersing the water into the portafilter, and controlling the pressure of the extraction. There are many different types of group heads each with their own advantages and disadvantages. Some focus on temperature stability, whereas others on pre-infusion features, and others are designed to control the lever. Some come with a combination of both, such as the E61. This is a popular choice among baristas as it provides a variety of benefits in one package.

As you can see in the image above, the group head has a number of notches. You place your portafilter in these notches and then turn the head around to secure it. There is also a gasket of rubber that is a part of the notches and helps to create an airtight seal when you insert your portafilter into the machine. The notches allow for an exact placement of the portafilter. This is essential for an accurate extraction.

The group head not only lets you to insert your portafilter easily but also maintains an even temperature. This is achieved by cycling hot water around the portafilter and through the brew basin, ensuring that the temperature is always at the right level to extract the coffee. This is important because just a few degrees could be the difference between a good and excellent espresso.

The Pump

The motorized pumps that are used in rotary buy espresso machines machines provide the nine atmospheric bar pressure that is required for espresso extraction. This is different from manual piston machines that use levers. The pressure builds by drawing tap water from a reservoir, and pumping it through a heat exchanger prior being pumped through the ground coffee in the group head.

Pumps tend to be cheaper than piston-driven machines and tend to last longer, however both types of machines can become damaged due to excessive use and poor cleaning. Pumps are also more complex mechanically, and can add to the price of even the simplest models.

Some espresso machines can eliminate the pump entirely and utilize steam pressure to make espresso. The downside is that the same boiler that produces steam also increases the temperature of the water to the point of boiling which can cause excessive extraction. In addition these machines are often required to restore their pressure between cups, which takes time and energy.

Many espresso machines make use of a rotary or vibration pump. A vibration model makes use of an oscillating disk to create pressure, while the rotating model pushes hot water through the ground at a fast speed. Both machines can make great espresso, however rotary machines are more quiet, durable and less likely to break.

The Boiler

The boiler is the part that heats water to the optimal temperature for extraction. The resulting steam is then transferred to the portafilter containing the ground espresso coffee and is then pumped down into the cup. During this process the steam is able to create enough pressure to push the coffee grounds through. This results in a layer crema on top. This is the hallmark of a good espresso.

There are three different types of espresso machines, each with different pumps and the temperature of the brew. There are a variety of ways in which the brew can be controlled and the size of the cup that the machine can produce.

The first espresso machines were steam-types. The first Espresso Machines Home machines were steam-type machines. 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 coffee machine is a semiautomatic model with an electric pump. When people think of espresso machines, they think of these machines. Semi-automatic machines require you to grind and tamp the beans on your own The pump, however, regulates the water flow and pressure. This is a perfect compromise between human control and mechanised reliability.

The Filter

Espresso machines usually use filters that separate the grounds of the coffee from the hot water. The filter is also an essential part of the machine's temperature control, since it helps to prevent overheating.

A filter also helps with flavor since it allows for a longer flowering phase. This helps the beans let their nuances out and provides an opportunity for a better extraction.

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

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

In an espresso machine that is driven by steam, hot water is heated in an airtight container to create steam. Steam then pushes the hot water through the grounds at a high pressure. These types of machines are typically less expensive and simpler to maintain than pumps-driven models. However, they are limited in their ability to provide the perfect brewing conditions since they operate at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bars.

In recent years, espresso machines powered by compressed air-pump are becoming increasingly popular. They make use of an air compressor to force hot water through the ground. They are also more mobile than electric steam-driven espresso machines.