10 Meetups About Machine Espresso You Should Attend

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. How exactly does it work?

In order to make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee, but the difference is in the pressure.

The Group Head

The group head is the portafilter you put in when making espresso. It is responsible for dispersing the water into the portafilter before controlling the pressure of the resulting extraction. There are a variety of group heads each with its own advantages and disadvantages. Some are designed for stability in temperature, while others are specifically designed to handle pre-infusion. Others are made to control the lever. Some have a combination, such as the E61. This is a preferred choice for baristas because it offers multiple benefits in one package.

As you can see in the above photo, the group head has several notches where you place your portafilter and then twist it with your hands to lock it in. A rubber gasket is located inside the notches to help make a seal when you insert your portafilter. The notches allow for precise placement of your portafilter. This is crucial to ensure an even extraction.

Aside from allowing you to easily connect your portafilter, the group head is also responsible to ensure that the temperature remains even. This is accomplished by cycling hot water around the portafilter, and through the brew-basket, making sure that the temperature is at the right level for extraction. It is important to note that even a slight difference can make the difference between a great and a excellent espresso.

The Pump

The motorized pumps in rotary espresso machines provide the nine atmospheric bar pressure needed to extract espresso. This differs from manually operated piston machines that employ a lever. The pressure is created by removing tap water from a reservoir and pumping it through a heat exchanger prior it is shot through the ground coffee inside the group head.

Pumps tend to be less expensive than piston-driven machines, and they tend to last longer, but both types of machines could become damaged due to excessive use and poor cleaning. Pumps are also more complex mechanically, which can increase prices of even simple models.

Certain espresso machines utilize steam pressure instead of a pump to make espresso. The drawback of this is that the same boiler that produces steam also increases the temperature of water to boiling which could lead to over-extraction. Additionally the machines often have to rebuild their pressure between cups, which requires time and energy.

Many espresso machines make use of an rotary or vibrating pump, with a vibration model that uses a vibrating disc to create the pressure and rotating models that push hot water through the grounds under high speed. Both types of machine are capable of producing excellent espresso, however the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the component which heats the water to the optimal temperature to extract. The resulting steam is then transferred to the portafilter which holds the ground espresso coffee and gets funnelled down into the cup. The steam creates enough pressure to push the coffee grounds through. This results in a layer of crema on top. This is one of the main characteristics of a great espresso.

There are three distinct types of espresso machines, each having distinct pumps and the temperature of the brew. There are different ways that the brew may be controlled, as well as the size of the cup that the machine is capable of making.

The earliest espresso machines were steam types. They utilized one boiler to create steam and brew, however, the pressure they could produce was very low - just two bars of atmospheric pressure, at most. This resulted in the coffee tasting burnt and bitter. The modern espresso machine was designed by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most well-known espresso maker is a semi-automatic machine that has an electric pump. When people think of espresso machines, they think of these machines. Semi-automatic machines require you to grind and tamp the beans on your own however the pump controls the water flow and pressure. This is a great compromise between the human touch and the mechanized accuracy.

The Filter


Espresso machines typically have a filter that separates the coffee grounds from the hot water. The filter is also an important component of the temperature control system as it prevents the machine from overheating.

A filter also improves flavor, as it permits the beans to flower for a longer period of time. This helps the beans to release their nuances and gives an opportunity for a better extraction.

simply click the following page is important to keep in mind that even the best filter can result in a bad cup of coffee. The quality of the beans and the extraction, remain vital.

It's in this area that the magic happens. This is the reason why espresso tastes so good. The grouphead, sometimes referred to as the brewhead, is where the portafilter (the container you place the coffee ground into) is placed when you're making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight container to create steam, which is then pushed through the grounds at high pressure. These machines are less expensive and easier for the user to maintain than pumps-driven models. However, they are limited in their capacity to create 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 use an air-compressor to force hot water into the ground, and are more mobile than steam-driven electric espresso machines.

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Pub: 03 Apr 2024 01:57 UTC
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