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How Does Machine Espresso Work?

The machine espresso uses precise pressure, as well as a filtering technology that is amazing to create the coffee you love. But how 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 major difference is in the pressure.

The Group Head

The group head is the portafilter is inserted when you are making espresso. It disperses water into the portafilter, and regulates the pressure of the extraction. There are several different types of group heads, each with their own advantages and disadvantages. Some are designed to provide the stability of temperature while some are designed to handle pre-infusion. Others are made to control the lever. Some include a combination like the E61. This is a very popular choice for baristas due to the fact that it has multiple advantages in a single package.

As you can see from the above photo the head of the group is fitted with a variety of notches. The portafilter is placed inside these notches, and then turn the head around to secure it. A gasket made of rubber is placed inside the notches, which helps create a seal as you insert your portafilter. The notches allow for the precise placement of the portafilter. This is essential for a consistent extraction.

Apart from allowing you easily connect your portafilter, the group head is responsible to ensure that the temperature remains even. It does this by cycling hot water through the brew basket, and around the portafilter to ensure that it's always at the correct temperature for extraction. This is important, as even a few degrees can mean the difference between excellent and great espresso.

The Pump

Unlike manual piston machines, which use a lever to pressurize water, rotary espresso machines rely on motorized pumps that provide the nine atmospheric bars of pressure necessary for espresso extraction. This pressure is generated by pumping water through a heat exchanger and then through the ground coffee.

Pumps tend to be less expensive and last for longer than piston-driven machines. However, both types of machines may degrade due to overuse and inadequate cleaning. Pumps are also more complex mechanically, which could increase the cost of even the simplest models.

Certain espresso machines remove the pump entirely and use steam pressure to brew espresso. This can lead to over-extraction as the boiler that produces steam also warms the water to boil. Additionally, these machines frequently have to restore their pressure between cups, which requires time and energy.

Many espresso machines utilize either a rotary or vibration pump, which is a vibration model that uses a vibrating disc to generate the pressure, and the rotary model pushing hot water through the grounds under high speed. Both types of machines are capable of producing excellent espresso, however the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the part which heats the water to the optimal temperature to extract. The steam produced will eventually reach the portafilter, which holds the espresso grounds. It is then funneled into the cup. In this process, the steam creates pressure to push through the coffee grounds. This creates a foam on the top of the espresso. This is one of the main characteristics of a good espresso.

There are three kinds of espresso machines, each having different pumps and brew temperature. There are various ways that the brew may be controlled, as well as the size of the cup that the maker can create.

The first espresso machines were steam types. The first espresso machines were steam types. The coffee tasted bitter and burnt. The modern espresso machine was invented by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso machine is a semiautomatic with an electric pump. When people think of espresso machines, they imagine these machines. With a semi-automatic machine, you must grind the beans and then tamp them yourself but the pump is able to regulate the flow of water and pressure. This is a great compromise between the human touch and the mechanized accuracy.

The Filter

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

It also improves flavor as a filter allows for a longer bloom time. This allows the beans to release their nuances, and allows for better extraction.

It is important to keep in mind that even the best bean to cup espresso machine filter can make a bad cup of coffee. The quality of the beans and the extraction process, remain vital.

This is where the magic happens. It's what makes an espresso really taste great. The grouphead, also called the brew head, is where the portafilter (the container you place the ground coffee into) is placed when you're making espresso.

Steam-driven espresso machines use hot water heated in an airtight vessel to create steam. The steam then pushes hot water through the coffee grounds under high end espresso machine pressure. These kinds of machines are generally cheaper and easier to maintain than pump-driven models. However, they are limited in their ability to produce the ideal brewing conditions, since they operate at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bars.

In recent years, compressed air pump-driven espresso machines have become more popular. They utilize an air compressor to push hot water through the ground and are more mobile than electric steam-driven espresso machines.