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How Does Machine Espresso Work?

The machine espresso is made using precision pressure, and filtering system that is awe-inspiring to create the coffee you love. How does it work exactly?

Espresso is produced by pushing click here! at high pressure through finely-ground coffee. The process is similar to making drip coffee. However, the pressure is the major difference.

The Group Head

As the name implies, the group head is the place you place your portafilter when making espresso. It is responsible for dispersing water into the portafilter, and controlling the pressure of the extraction. There are a variety of group heads each with distinct advantages and drawbacks. Some are designed to provide temperature stability while others are specifically designed to handle pre-infusion. Others are made to control the lever. Some include a combination such as the E61. This is a popular choice among baristas as it provides a variety of advantages in a single package.

As you can see in the above photo The group head features several notches to place your portafilter before twisting it manually to secure it. There is also a gasket of rubber that is a part of the notches and helps to create an airtight seal after inserting your portafilter into the machine. The notches permit precise placement of the portafilter. This is vital for an even extraction.

Apart from allowing you easily place your portafilter in, the group head is responsible to maintain an even temperature. This is achieved by cycling hot water around the portafilter, and through the brew-basket, ensuring the temperature is always right for extraction. This is important, as even a small difference in temperature can make the difference between a good and 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 that are required for espresso extraction. This pressure builds up by drawing tap water from a reservoir, and pumping it through a heat exchanger before being shot through the ground coffee inside the group head.

Pumps are typically less expensive than piston-driven machines, and they tend to last longer, although both types of machines could be damaged by excessive use and inadequate cleaning. They also make mechanically complex and can lead to costly prices for even the simplest models.

Some espresso machines make use of steam pressure instead of a pump for brewing espresso. This can result in over-extraction because the boiler that produces steam also heats the water to boil. The machines also need to constantly rebuild their pressure between cups. This requires energy and time.

A majority of espresso machines utilize a rotary or vibration pump. A vibration model uses the vibrating disk to create pressure, whereas the rotating model pushes hot water through the ground at a fast speed. Both machines can make great espresso but rotary machines are more stable, quieter and less likely to break.

The Boiler

The boiler is what will heat the water to the right temperature to extract. The resultant steam then reaches the portafilter which holds ground espresso beans and is then pumped into the cup. During this process, the steam creates pressure to push through the grounds of the coffee. This results in a whipped-up top of the espresso. This is one of the main characteristics of a great espresso.

There are three types of espresso makers, which differ in the type of pump they employ and the degree of heat that the brew is. There are different ways to control the brew and the size of the cup that can be produced by the machine.

The earliest espresso machines were steam type. The earliest espresso machines were steam-type machines. This resulted in the coffee tasting bitter and burnt. This is why Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most commonly used espresso maker is a semi-automatic machine that has an electric pump. When people think of espresso machines, they envision these machines. Semi-automatic machines require you to grind and tamp the beans yourself however the pump controls the water flow and pressure. This is an excellent compromise between human touch and the mechanised accuracy.

The Filter





Typically, espresso machines use a filter to separate out the grounds of coffee when they pass through the hot water. The filter is also an essential element of the machine's temperature control, as it prevents overheating.

It also enhances flavor, since a filter lets you enjoy a longer bloom time. This helps the beans release their nuances and gives an opportunity for better extraction.

However it is crucial to keep in mind that even a top filter can make a terrible cup of coffee, since the quality of the beans and extraction is important.

This is where the magic happens, it's the thing that makes an espresso really taste great. The grouphead (also called the brewhead) is where you put the portafilter, the device used to place the coffee grounds in, when making espresso.

In the steam-driven espresso machine hot water is heated in an airtight tank to create steam. This is then pushed through the grounds with high pressure. These machines are less expensive and easier to maintain than pumps-driven models. However, they are not as efficient in their ability to provide the ideal brewing conditions, since they operate at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bar.

In recent years, compressed-air-pump-driven espresso machines have been gaining popularity. They utilize an air compressor to push hot water through grounds and are significantly more portable than electric steam-driven machines.