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How Does Machine Espresso Work?

Machine espresso makes use of precise pressure and incredible filter technology to produce the perfect cup of coffee. What exactly does it work?

Espresso is made by forcing hot water under high 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 the place you place your portafilter when brewing espresso. It is responsible for dispersing the water into the portafilter before controlling the pressure of the extraction. There are many different kinds of group heads each with its particular advantages and disadvantages. Some are focused on temperature stability, others on pre-infusion capabilities, while others are designed to control the lever. There are also some that come with a range of features, like the E61 one, which is to be the most popular among baristas due to its capacity to offer multiple benefits in one package.

As you can see in the image above, the group head has numerous notches that you can put your portafilter, then twist it with your hands to secure it. A rubber gasket is located inside the notches to help make a seal when you insert your portafilter. The notches permit precise placement of your portafilter. This is crucial for an even extraction.

The group head not only allows you to place your portafilter easily, but it also maintains a constant temperature. This is achieved by cycling hot water around the portafilter and through the brew basin, ensuring that the temperature is at the right level to extract the coffee machine espresso. This is vital, because even a few degrees can be the difference between a good and great espresso machine black friday.

The Pump

In contrast to manual piston machines which use a lever to pressurize water, rotating espresso machines rely upon motorized pumps to supply the nine atmospheric bars of pressure required for espresso extraction. This pressure is generated by pumping water through a heat exchanger and then through the ground coffee.

Pumps are generally less expensive and last for longer than piston-driven machines. However, both kinds of machines are susceptible to degrading due to overuse and insufficient cleaning. Pumps are also more complex mechanically, and can add to prices of even simpler models.

Some espresso machines make use of steam pressure instead of a pump to brew espresso. The downside is that the boiler that produces steam also raises the temperature of the water bean to cup espresso machines boiling which can cause excessive extraction. The machines also need to constantly rebuild their pressure in between cups. This takes energy and time.

Many espresso machines use either a vibration or rotary pump. A vibration model utilizes a rotating disk to generate pressure, whereas the Rotary model pushes hot coffee through the ground at a rapid speed. Both machines produce great espresso but rotary machines are more stable, quieter and less likely to break down.

The Boiler

The boiler is used to heat the water to the right temperature to extract. The resulting steam reaches the portafilter containing the ground espresso coffee and is then funneled down into the cup. During this process the steam causes enough pressure to push the grounds of the coffee through. This results in a crema on top of the espresso. This is one of the main characteristics of a good espresso.

There are three types of espresso makers, which differ in the kind of pump they use and how hot the brew is. There are a variety of ways that the brew can be controlled as well as the size of the cup that the maker can create.

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

The most common espresso maker is a semiautomatic machine that has an electric pump. These are what people imagine when they think of an espresso machine. With a semi-automatic espresso machine, you must grind the beans and tamp them by hand. The pump regulates the flow of water and pressure. This is an excellent combination of human control and mechanized reliability.

The Filter

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

It also improves flavor, as a filter can allow for a longer bloom time. This helps the beans to release their nuances and gives the chance for better extraction.

It is important to remember that even the finest filter can make a bad cup of coffee. The quality of the beans as well as the extraction, remain vital.

It's here that the magic occurs. This is the reason why espresso tastes so delicious. The grouphead (also known as the brewhead) is where you place the portafilter - the thingy which you put the coffee grounds in, while making espresso.

In the steam-driven espresso machine hot water is heated in an airtight container to create steam, which then pushes the hot water through the grounds with high pressure. These machines are less expensive and easier to maintain than pumps-driven models. They are however limited for creating the ideal conditions for brewing since they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent times, professional espresso machine for home machines powered by a compressed air compressor have become increasingly popular. They use an air-compressor to push hot water across the ground. They are also more mobile than steam-driven electric espresso machines.