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https://www.coffeee.uk/categories/coffee-machines
How Does Machine Espresso Work Machine espresso makes use of precise pressure and amazing filter technology to make the perfect cup of coffee What exactly does it work Espresso is created by forcing hot water under pressure through finely ground coffee The process is similar to making drip coffee However the pressure is the primary difference The Head of the Group As the name suggests the group head is the place you insert your portafilter when brewing espresso It disperses water into the portafilter and controls the pressure of the extraction There are several different types of group heads each with its unique advantages and disadvantages Some are focused on temperature stability while others on preinfusion options and others are designed to control the lever Some are a combination like the E61 This is a popular choice among baristas since it provides multiple advantages in a single package As you can see from the picture above the group head is fitted with a variety of notches You place your portafilter in these notches and then twist the head to lock it There is also a rubber gasket which is located inside the notches to help create an airtight seal after inserting your portafilter into the machine The notches on the head allow for a precise location of the portafilter which is necessary for a consistent extraction The group head not only allows you to insert your portafilter easily however it also keeps an even temperature It does this by cycling hot water through the brew container and around the portafilter ensuring that its always at the right temperature to extract This is crucial since just a few degrees could make the difference between a excellent and great espresso The Pump Contrary to manual piston machines which rely on a lever to pressurize water rotating espresso machines rely upon motorized pumps to supply the nine atmospheric bars of pressure that are required for espresso extraction The pressure is created by removing tap water from a reservoir and pumping it through a heat exchanger before it is shot through the ground coffee inside the group head Pumps are typically more affordable and last longer than pistondriven machines However both types of machines may degrade because of excessive use and insufficient cleaning Pumps are also more complicated mechanically and can add to prices of even simpler models Certain espresso machines do away with the pump completely and employ steam pressure to create espresso The drawback is that the boiler that produces steam also increases the temperature of the water to the point of boiling which can cause excessive extraction In addition the machines often have to restore their pressure between cups which requires time and energy A majority of espresso machines utilize a rotary or vibration pump A vibration model makes use of the vibrating disk to create pressure whereas a rotary model pushes hot water through the ground at a fast speed Both types of machines can make excellent espresso however rotary machines are quieter and more durable than vibration pumps The Boiler The boiler is the element which heats the water to the optimal temperature for extraction The resultant steam then reaches the portafilter containing the ground espresso coffee and gets funnelled down into the cup The steam causes pressure to push through the grounds of the coffee This creates a foam on top of the espresso This is one of the hallmarks of a great espresso There are three kinds of espresso makers They differ in the type of pump they employ and how hot the espresso is There are different ways to control the brew as well as the size of the cup that can be made by the machine The earliest espresso machines were steam types The first espresso machines were steam types The coffee tasted bitter and burned The modern espresso machine was developed by the Milanese producers Luigi Bezzerra Desiderio Pavoni The most popular espresso maker is a semiautomatic device that has an electric pump These are what people imagine when they think of an espresso machine Semiautomatic machines require you to grind and tamp the beans on your own however the pump controls the flow of water and pressure This is a great compromise between the human touch and the mechanised consistency The Filter Espresso machines usually have a filter that separates the grounds of the coffee from the hot water The filter is also an essential component of the machines temperature control as it prevents overheating It also improves flavor as a filter allows for a more prolonged bloom phase espresso coffee machine allows beans to release their flavor and gives an opportunity to improve extraction However it is important to keep in mind that even a good filter can produce a bad cup of coffee as the quality of the beans and extraction are crucial Its here that the magic takes place This is what makes espresso taste so delicious The grouphead also called the brewhead is where you put the portafilter the device that you put the grounds of coffee into when making espresso Steamdriven espresso machines make use of hot water that is heated in an airtight container to produce steam The steam then pushes hot water into the grounds of coffee under high pressure These machines are cheaper and easier for the user to maintain than pumpsdriven models However they are limited in their ability to create the ideal conditions for brewing since they operate at 115 bars of pressure while the perfect shot requires 910 bars In recent years espresso machines driven by compressed airpump have become increasingly popular They make use of an air compressor to push hot water through the ground They are also more mobile than steamdriven electric espresso machines
