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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 make the coffee you love. What exactly does it work?

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

The Group Head

The name implies, the group head is where you put your portafilter in when making espresso. It is responsible for dispersing water into the portafilter and then controlling the pressure of the resulting extraction. There are many different types of group heads each with their own advantages and drawbacks. Some are designed to provide stability of temperature while others are built to handle pre-infusion. Others are built to control the lever. Some include a combination such as the E61. This is a preferred choice for baristas since it provides multiple advantages in a single package.

As you can see from the above photo, the group head is equipped with several notches. The portafilter is placed into these notches and twist the head to secure it. A gasket made of rubber is positioned inside the notches, which helps make a seal when you insert your portafilter. The notches permit precise placement of the portafilter. This is crucial for an even extraction.

In addition to allowing you easily insert 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, making sure that it is always at the correct temperature for extraction. This is important because even a few degrees can make the difference between good and great espresso.

The Pump

Unlike manual piston machines, which use a lever to pressurize water, rotating espresso machines rely upon motorized pumps to provide the nine atmospheric bars of pressure required to extract espresso. The pressure is created by drawing tap water from a reservoir and espresso machine black friday (visit our website) pumping it through a heat exchanger prior being pumped through the ground coffee in the group head.

Pumps are typically less expensive and last longer than piston-driven machines. However, both types of machines may degrade due to excessive use and poor cleaning. Pumps are also more complicated mechanically, and can add to the cost of even the simple models.

Some espresso machines eliminate the pump entirely and make use of steam pressure to make espresso. The drawback of this is that the same boiler that produces steam also increases the temperature of water to the point of boiling which can cause excessive extraction. Additionally these machines typically have to restore their pressure between cups, which takes time and energy.

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

The Boiler

The boiler is what is used to heat the water to the ideal temperature to extract. The resultant steam then reaches the portafilter containing the ground espresso coffee, and is then pumped down into the cup. The steam generates enough pressure to push the grounds of coffee through. This creates a layer crema that is then poured over. This is a hallmark of a good espresso.

There are three kinds of espresso makers. They differ in the type of pump they employ and the degree of heat that the espresso is. There are also different ways that the brew can be controlled, as well as the size of the cup that the machine can produce.

The first espresso machines were steam types. They employed one boiler to create both steam and brew but the pressure they could create was minimal - two bars of atmospheric pressure maximum. This led to the coffee tasting burnt and bitter. This is the reason why Milanese makers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most well-known espresso machine is a semiautomatic with an electric pump. These are the things people think of when they think of an espresso machine. Semi-automatic machines require you to grind and tamp your beans yourself, but the pump regulates the water flow and pressure. This is a great compromise between human control and mechanised accuracy.

The Filter

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

A filter can also help with flavor because it allows for a longer flowering period. This allows the beans to release their flavors, and allows for better extraction.

However it is crucial to remember that even a top filter could result in a bad cup of coffee, because the quality of the beans and extraction is essential.

This is where the magic happens, it's what makes an espresso really taste great. The grouphead, also referred to as the brew head, is where the portafilter (the thing you put the coffee ground into) is placed when making espresso.

In an espresso machine that is driven by steam, hot water is heated in an airtight tank to create steam, which is then pushed through the grounds at high pressure. These types of machines tend to be less expensive and easier to maintain than pump-driven models. They are however limited in their ability 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, espressomachines compressed air pump-driven espresso machines have become more popular. They use an air-compressor to push hot water across the ground and are more mobile than steam-driven electric espresso machines.