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How Does Machine Espresso Work?

Machine espresso utilizes precise pressure and mind-blowing filter technology to make the coffee we love. How exactly does it work?

To make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee. However, it is the pressure that makes the main difference.

The Head of the Group

The group head is the portafilter that is inserted when you are making espresso. It distributes water into the portafilter, and then regulates the pressure during the extraction. There are numerous kinds of group heads each with distinct advantages and disadvantages. Some are designed for stability in temperature, while others are built to handle pre-infusion. Others are made to control the lever. Some include a combination such as the E61. This is a very popular choice for baristas due to the fact that it has multiple advantages in one package.

As you can see in the above photo the group head is made up of several notches where you place your portafilter before twisting it manually to secure it. There is also a gasket of rubber which is located inside the notches and helps to create a seal when you insert your portafilter into the machine. The notches allow for precise placement of your portafilter. This is essential for an efficient extraction.

In addition to allowing you easily insert your portafilter, the group head is also responsible for maintaining an even temperature. This is done by cycling hot water around the portafilter, and through the brew-basket, making sure the temperature is always right to extract the coffee. It is crucial to keep in mind that even a tiny variation can mean the difference between a great and a great espresso.

The Pump

In contrast to manual piston machines which rely on a lever that pressurize water, the rotary espresso machines use motorized pumps to deliver the nine atmospheric bars of pressure required for espresso extraction. The pressure is built 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 may degrade due to excessive use and inadequate cleaning. Pumps are also more complicated mechanically, which could increase prices of even simple models.

Certain espresso machines can eliminate the pump completely and make use of steam pressure to make espresso. This can result in over-extraction because the boiler that makes steam also warms the water to boil. These machines also have to continuously rebuild their pressure between cups. This requires energy and time.

Many espresso machines utilize the rotary or vibration pump, with a vibration model that uses a vibrating disc to create the pressure and the rotary model pushing hot water through the grounds under high speed. Both machines can produce excellent espresso, but rotary machines are more stable, quieter and less likely to break.

The dual boiler espresso machine - click homepage,

The boiler is the part that heats water to the optimal temperature to extract. The resulting steam reaches the portafilter, which contains the ground compact espresso machine coffee and gets funnelled down into the cup. The steam creates pressure that pushes through the grounds of the coffee. This results in a layer crema on top. This is a hallmark of a great espresso.

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

The first espresso machines were steam types. They utilized a single boiler to make both brew and steam, but the pressure they could generate was low - only two bars of atmospheric pressure maximum. 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 commonly used espresso maker is a semiautomatic machine that has an electric pump. This is what people envision when they think of an espresso machine. Semi-automatic machines require you to grind and tamp the beans yourself The pump, however, regulates the water flow and pressure. This is a fantastic solution that combines human control with mechanized reliability.

The Filter

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

It also aids in flavor, since a filter allows for a longer bloom time. This allows beans to release their flavors and provides an opportunity for a better extraction.

It is important to remember that even the best filter can make a bad cup of coffee. The quality of the beans, and the extraction, are still crucial.

It's in this area that the magic occurs. This is what makes espresso taste so delicious. The grouphead, also called the brew head, is the place where the portafilter (the thingy you put the ground coffee into) is placed when you're making espresso.

In the steam-driven italian espresso machines machine hot water is heated in an airtight tank to create steam. This then pushes the hot water through the grounds at a high pressure. These kinds of machines are generally cheaper and easier to maintain than pumps-driven models. They are however limited to create the ideal brewing conditions as they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

In recent years, espresso machines driven by compressed air-pump have become increasingly popular. They utilize an air compressor to force hot water into the ground. They are also more mobile than steam-driven electric espresso machines.