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How Does Machine Espresso Work?

The machine espresso uses precision pressure, and a filtering system that is awe-inspiring to make the coffee you enjoy. What exactly does it work?

To make an espresso and filter coffee machine hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee, but the key difference is in the pressure.

The Head of the Group

As the name implies the group head is the place you place your portafilter while brewing Mini Espresso Machine. It disperses water in the portafilter and controls the pressure of the extraction. There are several different types of group heads each with its own advantages and disadvantages. Some are designed to provide the stability of temperature while some are designed to handle pre-infusion. Others are built to control the lever. Some include a combination like the E61. This is a very popular choice for baristas because it offers multiple advantages in one package.

As you can see from the photo above, the group head is fitted with a variety of notches. You place your portafilter into these notches and turn the head around to secure it. A gasket made of rubber is positioned inside the notches to help create a seal when you insert your portafilter. The notches on the head allow for a precise positioning of the portafilter which is necessary to ensure an efficient extraction.

The group head not only lets you to place your portafilter easily however it also keeps the temperature at a constant level. This is accomplished by cycling hot water around the portafilter and through the brew-basket to ensure that the temperature is constant for extraction. It is important to note that even a slight differences can make the distinction between a great and a great espresso.

The Pump

The motorized pumps that are used in espresso machines rotary provide nine atmospheric bar pressure that is required for espresso extraction. This differs from manually operated piston machines that employ levers. This pressure is built up 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, but both types of machines can become damaged due to excessive use and poor cleaning. Pumps are also more complicated mechanically, which can increase the cost of even the simple models.

Certain espresso machines utilize steam pressure instead of a pump to brew espresso. This can cause over-extraction because the boiler that produces steam also causes the water to boil. The machines also need to continually rebuild their pressure between cups. This requires energy and time.

A large majority of professional espresso maker machines employ a rotary or vibration pump. A vibration model utilizes a vibrating disk to generate pressure, while the rotary model pushes hot water through the ground at a high speed. Both machines can make excellent espresso, but rotary machines are more stable, quieter and less likely to fail.

The Boiler

The boiler is the component that heats water to an ideal temperature for extraction. The steam that is created will eventually reach the portafilter, which holds the espresso grounds. It is then pumped into the cup. During this process the steam causes enough pressure to push the grounds of the coffee through. This results in a whipped-up the top of the espresso. This is one of the hallmarks of a great espresso.

There are three kinds of espresso makers, and they differ in the type of pump they use and how hot the coffee is. There are different ways that the brew can be controlled as well as the dimensions of the cup the machine can produce.

The first espresso machines were steam-type. They utilized only one boiler to make both brew and steam, but the pressure they could create was minimal - two bars of atmospheric pressure at most. This resulted in the coffee tasting bitter and burnt. The modern espresso coffee machine for home machine was invented by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso maker is a semi-automatic machine with an electric pump. When people think of espresso machines, they picture these machines. If you have a semi-automatic machine you must grind the beans and then tamp them by hand, but the pump controls the flow of water and pressure. This is an excellent compromise between human touch and the mechanised accuracy.

The Filter

Typically, espresso machines utilize a filter to separate out the grounds of the coffee for espresso machine as they go through the hot water. The filter is also a crucial element of the temperature control system, since it helps prevent the machine from overheating.

It also improves flavor, since a filter can allow for a longer bloom phase. This allows the beans to release their flavor and allows for a better extraction.

It is important to remember that even the best filter can result in a bad cup of coffee. The quality of the beans and the extraction, remain vital.

This is where the magic happens. It's what makes espresso taste great. The grouphead, also referred to as the brew head, is where the portafilter (the device you put the ground coffee in) sits when you're making espresso.

Steam-driven espresso machines use hot water heated in an airtight container to create steam. The steam then pushes hot water through grounds of the coffee under pressure. They are less expensive and easier for the user to maintain than pumps-driven models. They are however limited for creating the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

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