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How Does Machine Espresso Work?

The machine espresso is made using precise pressure, as well as a filtering system that is awe-inspiring to make the coffee you enjoy. What exactly does it work?

To make espresso hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee. However the pressure is the main difference.

The Head of the Group

The name implies, the group head is the place you put your portafilter in when making espresso. It disperses the water into the portafilter, and then regulates the pressure during the extraction. There are many different types of group heads each with its own advantages and drawbacks. Some are focused on temperature stability, whereas others on pre-infusion capabilities, and still others are designed to control the lever. Some have a combination, like the E61. This is a popular choice among baristas because it offers multiple advantages in a single package.

As you can see in the above image The group head features many notches in which you can place your portafilter and twist it by hand to lock it in. A gasket of rubber is situated within the notches to create a seal while you insert your portafilter. The notches allow for the precise placement of the portafilter. This is vital for a consistent extraction.

In addition to allowing you effortlessly insert your portafilter the group head is responsible to ensure that the temperature remains even. This is done by cycling hot water around the portafilter, and through the brew-basket to ensure the temperature is always right to extract the coffee. It is important to realize that even a tiny variation can mean the difference between a decent and a great discount espresso machines (reviews over at Vidublog).

The Pump

In contrast to manual piston machines which rely on a lever to pressurize water, Rotary espresso machines rely on motorized pumps to deliver the nine atmospheric bars of pressure required to extract espresso. This pressure builds up by drawing tap water from a reservoir and pumping it through a heat exchanger before being pumped through the ground coffee in the group head.

Pumps tend to be less expensive than piston-driven models, and they tend to last longer. However, both types of machines can get damaged through overuse and lack of cleaning. Pumps are also more complex mechanically, which can raise the cost of even the simple models.

Certain espresso machines eliminate the pump completely and instead utilize steam pressure to make espresso. This can result in over-extraction because the boiler that produces steam also heats the water to boil. Additionally the machines often have to rebuild their pressure between cups, which takes time and energy.

Many espresso machines make use of a vibration or rotary pump, which has a vibration model using a rotating disc to generate the pressure and a rotary model pushing hot water through the grounds under high speed. Both machines produce great espresso, but rotary machines are more quiet, durable and less likely to fail.

The Boiler

The boiler makes the water warm to the ideal temperature to extract. The steam that is produced reaches the portafilter that contains the ground espresso coffee and is then pumped into the cup. During this process the steam is able to create enough pressure to push the grounds of the coffee through. This creates a layer crema that is then poured over. This is the hallmark of a great italian espresso machine.

There are three types of espresso makers. They differ in the type of pump they use and the degree of heat that the espresso is. There are various ways in which the brew can be controlled, as well as the size of the cup the machine can produce.

The first espresso machines uk machines were steam-based. The earliest espresso machine with milk frother machines were steam-type machines. This resulted in the coffee tasting bitter and burnt. The modern espresso machine was invented by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso maker is a semi-automatic one that has an electric pump. These are the things people think of when they imagine an espresso machine. With a semi-automatic machine you have to grind the beans and tamp them by hand. However, the pump controls the flow of water and pressure. This is an excellent compromise between human touch and mechanized consistency.

The Filter

Typically, espresso machines utilize 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, as it prevents overheating.

It also aids in flavor as a filter lets you enjoy a longer bloom phase. This helps the beans release their nuances and gives an opportunity for better extraction.

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

This is where the magic happens, and it's what makes an espresso really taste great. The grouphead, often called the brew head, is where the portafilter (the device you put the ground coffee in) is placed when making espresso.

In the steam-driven espresso machine hot water is heated in an airtight tank to produce steam, which then pushes the hot water through the grounds under high pressure. These machines are cheaper and easier for the owner to maintain than pumps-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, espresso machines powered by a compressed air pump have become increasingly popular. They utilize an air compressor to push hot water through grounds and are much more portable than steam-driven electric machines.