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How Does Machine Espresso Work?

The machine espresso makes use of precise pressure, as well as a filter technology that is mind-blowing to create the coffee you love. What exactly does it work?

In order to make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee, but the key difference is in the pressure.

The Group Head

The group head is the portafilter is inserted when you are making espresso. It is responsible for dispersing the water into the portafilter, and controlling the pressure of the resulting extraction. There are a variety of group heads, each with its own advantages and disadvantages. Some focus on temperature stability, whereas others on pre-infusion capabilities, and still others are designed to control the lever. Some 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 picture above the head of the group has a number of notches. It is possible to place your portafilter in these notches, then turn the head around to secure it. There is also a gasket of rubber that resides inside the notches, which helps create an airtight seal after inserting your portafilter into the machine. The notches on the head allow for an exact location of the portafilter which is crucial for an efficient extraction.

Aside from allowing you to easily insert your portafilter, the group head is responsible for maintaining an even temperature. It does this by circulating hot water through the brew container and around the portafilter, making sure that it is always at the right temperature to extract. It is important to note that even a tiny difference can make the difference between a good and a great espresso.

The Pump

Contrary to manual piston machines which rely on a lever that pressurize water, Rotary espresso machines rely on motorized pumps to supply the nine atmospheric bars of pressure required for espresso extraction. The pressure is created by pumping water through a heat-exchanger and then through the ground coffee.

Pumps tend to be cheaper than piston-driven models, and they tend to last longer. However, both types of machines could get damaged through overuse and lack of cleaning. They also add mechanical complexity, which can result in the cost of even the simplest models.

Some espresso machines remove the pump completely and instead use steam pressure to brew espresso. The downside is that the boiler that produces steam also increases the temperature of water to boiling and can result in excessive extraction. The machines also need to constantly rebuild their pressure between cups. This takes energy and time.

Many espresso machines employ a vibration or rotary pump, which is a vibration model that uses a vibrating disc to create pressure and a rotary model pushing hot water through the grounds at high speed. Both machines can make excellent espresso, however rotary machines are more quiet, durable and less likely to fail.

The Boiler

The boiler is the element which heats the water to the optimal temperature to extract. The steam that is created is then directed to the portafilter, which is the container that holds the espresso coffee grounds. It is then poured into the cup. During this process, the steam causes pressure to push through the coffee grounds. This results in a whipped-up top of the espresso. This is a sign of a good espresso.

There are three different types of espresso machines, each with distinct pumps and the temperature of the brew. There are different ways that the brew can be controlled as well as the dimensions of the cup the machine can make.

The first espresso machines were steam-types. The earliest espresso machines were steam types. This led bean to cup espresso machines the coffee machine espresso tasting burnt and bitter. The modern italian espresso machines (click here to read) machine was designed by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most popular espresso machine with milk frother machine is a semiautomatic that has an electric pump. When people think of espresso machines, they picture these machines. If you have a semi-automatic machine you need to grind the beans and tamp them by hand, but the pump is able to regulate the flow of water and pressure. This is a perfect compromise between human control and mechanised reliability.

The Filter

Typically, espresso machines have filters that separate the grounds of coffee when they pass through the hot water. The filter is also a vital component of the machine's temp control, since it helps to prevent overheating.

It also improves flavor, as it allows for a longer bloom time. This helps the beans to release their flavors and provides an opportunity to improve extraction.

It is important to keep in mind that even the best filter could result in a poor cup of coffee. The quality of the beans as well as the extraction, remain vital.

It's here that the magic takes place. This is what makes espresso taste so delicious. The grouphead, often called the brew head, is the place where the portafilter (the thingy you put the ground coffee into) sits when you're making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight container to create steam, which then pushes the hot water through the grounds at a high pressure. These kinds of machines are generally less expensive and easier to maintain than pump-driven models. However, they are not as efficient 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 bar.

In recent years, compressed air-driven espresso machines have become more popular. They utilize an air compressor to force hot water through grounds and are much more portable than electric steam-driven machines.