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How Does Machine Espresso Work?

Machine retro espresso machine employs precise pressure and mind-blowing filter technology to make the coffee we love. How does it work exactly?

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

The Group Head

As the name implies, the group head is the place you place your portafilter while brewing espresso. It disperses the water into the portafilter, and then regulates the pressure of the extraction. There are a variety of group heads each with its own advantages and disadvantages. Some are designed to provide temperature stability while others are built to handle pre-infusion. Others are made to control the lever. Some are a combination, like the E61. This is a preferred choice for baristas as it provides a variety of benefits in one package.

As you can see in the photo above the group head is made up of several notches to place your portafilter and twist it manually to secure it. A gasket made of rubber is placed in the notches to create a seal while you insert your portafilter. The notches permit precise placement of the portafilter. This is essential for a consistent extraction.

In addition to allowing you easily insert your portafilter, the group head is responsible for maintaining a consistent temperature. This is accomplished by cycling hot water around the portafilter, and through the brew-basket to ensure the temperature is always right to extract the coffee. This is crucial, since even a small difference in temperature can mean the difference between good and excellent espresso.

The Pump

The motorized pumps used in rotary espresso machines provide the nine atmospheric bar pressure needed for espresso extraction. This is different from manual piston machines which use a lever. The pressure is created 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 cheaper than piston-driven machines and tend to last longer, but both types of machines can degrade with overuse and insufficient cleaning. Pumps are also more complex mechanically, which can raise the cost of even simple models.

Certain espresso machines utilize steam pressure instead of a pump to brew espresso. The drawback is that the dual boiler espresso machine that produces steam also increases the temperature of the water until it reaches boiling which could lead to excessive extraction. In addition these machines are often required to rebuild their pressure between cups, which takes time and energy.

A majority of espresso machines utilize an rotary or a vibration pump. A vibration model makes use of a rotating disk to generate pressure, while a circular model pushes hot liquid through the ground at a rapid speed. Both machines can produce excellent Espresso Home Machine (Http://Www.Annunciogratis.Net/Author/Dimecherry18) however rotary machines tend to be more quiet, durable and less likely to fail.

The Boiler

The boiler is the part that heats the water to the optimal temperature for extraction. The resulting steam reaches the portafilter that contains ground espresso beans and gets funnelled down into the cup. During this process, the steam causes pressure to push through the coffee grounds. This results in a layer crema that is then poured over. This is one of the hallmarks of a good espresso.

There are three different types of espresso machines, each with different types of pumps and the temperature of the brew. There are a variety of ways to control the brew and the size of the cup that can be produced by the machine.

The first espresso machines were steam type. The earliest espresso machines were steam types. This resulted in the coffee tasting bitter and burnt. The modern espresso machine was designed by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most popular espresso maker is a semi-automatic machine with an electric pump. These are the images people have when they think of an espresso maker. With a semi-automatic machine you must grind the beans and tamp them by hand. The pump controls the flow of water and pressure. This is an excellent compromise between human control and mechanized reliability.

The Filter

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

Filters also aid in flavor, as it permits the beans to flower for a longer period of time. This allows the beans to release their flavor and allows for better extraction.

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

It's in this area that the magic takes place. This is the reason why espresso tastes so good. The grouphead, often called the brew head, is where the portafilter (the thing you put the coffee grounds into) is placed when making espresso.

In a steam-driven espresso machine hot water is heated in an airtight container to produce steam, which is then pushed through the grounds at high pressure. These types of machines are usually cheaper and easier to maintain than pump-driven models. They are however limited to create the ideal brewing conditions as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent times, espresso machines powered by a compressed air compressor have become increasingly popular. They make use of an air compressor to push hot water through the ground, and are more mobile than electric steam-driven espresso machines.