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How Does Machine Espresso Work?

Machine espresso employs precise pressure and mind-blowing filter technology to create the delicious coffee we enjoy. What exactly is it that makes it work?

In order to make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee however the main difference lies in the pressure.

The Head of the Group

The name implies the group head is the place you place your portafilter when brewing espresso. It is responsible for dispersing the water into the portafilter, and controlling the pressure of the resulting extraction. There are many different kinds of group heads each with its distinct advantages and disadvantages. Some focus on temperature stability, while others on pre-infusion capabilities, while others are designed to control the lever. Some have a combination, like the E61. This is a very popular choice for baristas since it provides multiple benefits in one package.

As you can see in the above photo the head of the group is equipped with several notches. It is possible to place your portafilter into these notches and turn the head around to secure it. There is also a rubber gasket which is located inside the notches and helps create an airtight seal after inserting your portafilter into the machine. The notches permit an exact placement of the portafilter. This is essential for an accurate extraction.

The group head is not just able to allow you to insert your portafilter easily but also maintains the temperature at a constant level. This is achieved by cycling hot water around the portafilter and through the brew-basket to ensure that the temperature is constant to extract the coffee. This is crucial, since just a few degrees could mean the difference between excellent and great espresso.

The Pump

The motorized pumps in rotary espresso machines supply the nine atmospheric bar pressure needed to extract espresso. This differs from manual piston machines that rely on levers. This pressure is generated by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are generally less expensive and last longer than piston-driven machines. However, both types of machines are susceptible to degrading because of excessive use and poor cleaning. Pumps are also more complex mechanically, which can increase prices of even most basic models.

Certain espresso machines utilize steam pressure instead of a pump to make espresso. The downside is that the boiler that produces steam also raises the temperature of water to boiling which can cause over-extraction. In addition the machines often have to rebuild their pressure between cups, which requires time and energy.

Many espresso machines make use of a vibration or rotary pump, which has a vibration model using a vibrating disc to generate the pressure, and the rotary model pushing hot water through the grounds at high speed. Both machines can make great espresso however rotary machines tend to be quieter, more durable and less likely to break down.

The Boiler

The boiler is the part which heats the water to the ideal temperature to extract. The steam produced is then directed to the portafilter, which is a container for lelit espresso machine (galpaodainformatica.com.br) grounds. It is then poured into the cup. During this process the steam creates enough pressure to push the coffee grounds through. This creates a layer crema that is then poured over. This is one of the hallmarks of a great espresso.

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

The earliest espresso machines were steam types. The earliest espresso machines were steam-type machines. The coffee tasted bitter and burned. The modern espresso machine was developed by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most common espresso machine is a semiautomatic model with 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 while the pump controls the flow of water and pressure. This is a great compromise between the human touch and mechanized quality.

The Filter

la marzocco espresso machine machines usually use a filter that separates the grounds of the coffee from hot water. The filter is also a vital component of the machine's temp control, since it helps to prevent overheating.

It also enhances flavor as a filter allows for a longer bloom phase. This lets the beans let their nuances out, and also allows for better extraction.

However it is crucial to remember that even a good filter can result in a poor cup of coffee, since the quality of the beans and extraction are vital.

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

Steam-driven espresso machines make use of hot water that is heated in an airtight vessel to create steam. The steam then moves hot water through the grounds of coffee at 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 brewing conditions since they operate at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bar.

In recent times, espresso machines powered by a compressed air compressor have become increasingly popular. They use an air compressor to push hot water through the grounds and are more portable than steam-driven electric machines.