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https://www.coffeee.uk/products/gaggia-manual-espresso-cappuccino-machine-with-magnet-valve

How Does Machine Espresso Work The machine espresso is made using precision pressure and a filter technology that is mindblowing to create the coffee you love How exactly does it work Espresso is made by pushing hot water under high pressure through finelyground coffee The process is similar to making drip coffee but the key difference is in the pressure The Group Head The group head is the portafilter you put in when making espresso It disperses water in the portafilter and regulates the pressure during the extraction There are a variety of group heads each with its own advantages and drawbacks Some are focused on temperature stability whereas others on preinfusion capabilities and still others are designed to control the lever There are also some that contain a variety of features like the E61 that is the most popular choice among baristas because of its ability to offer multiple benefits in one package As you can see in the above photo the head of the group is equipped with several notches It is possible to place your portafilter in these notches then turn the head around to secure it There is also a gasket made from rubber in the notches and helps to create an airtight seal after inserting your portafilter into the machine The notches permit precise placement of your portafilter This is vital for a consistent extraction Aside from allowing you to easily insert your portafilter the group head is responsible to ensure that the temperature remains even This is achieved by cycling hot water around the portafilter and through the brew basin ensuring that the temperature is always at the right level to extract the coffee This is vital because even a few degrees can mean the difference between excellent and great espresso The Pump In contrast to piston machines that are manually operated which use a lever to pressurize water rotating espresso machines rely upon motorized pumps that provide the nine atmospheric bars of pressure that are required for espresso extraction The pressure is built by pumping water through a heat exchanger and then through the ground coffee Pumps tend to be less expensive than pistondriven machines and they tend to last longer but both types of machines may get damaged through overuse and lack of cleaning Pumps are also more complicated mechanically which can raise the price of even the simplest models Certain espresso machines can eliminate the pump completely and make use of steam pressure to make espresso The disadvantage of this is that the same boiler that produces steam also increases the temperature of the water to the point of boiling which can lead to overextraction These machines also have to continuously rebuild their pressure between cups This takes energy and time A majority of espresso machines utilize the rotary or vibration pump A vibration model utilizes an oscillating disk to create pressure while the Rotary model pushes hot coffee through the ground at high speed Both models can make a great espresso but Rotary machines are quieter and more durable than vibration pumps The Boiler The boiler is the element that heats water to an optimal temperature to extract espresso coffee machine resulting steam is then transferred to the portafilter containing ground espresso beans and is then funneled down into the cup The steam generates enough pressure to push the grounds of the coffee through This produces a layer of crema on top This is one of the hallmarks of a good espresso There are three different types of espresso machines each having a different type of pump and the temperature of the brew There are a variety of ways to control the brew and the size of cup that can be made by the machine The first espresso machines were steamtypes The first espresso machines were steamtype machines This led to the coffee tasting burnt and bitter The modern espresso machine was invented by the Milanese producers Luigi Bezzerra Desiderio Pavoni The most wellknown espresso machine is a semiautomatic model with an electric pump This is what people envision when they imagine an espresso machine With a semiautomatic machine you must grind the beans and then tamp them by hand The pump provides regulated water flow and pressure This is a fantastic combination of human control and mechanized accuracy The Filter Espresso machines usually use filters that separate the coffee grounds from the hot water The filter is also an essential component of the machines temperature control since it helps to prevent overheating Filters also aid in flavor since it allows for an extended flowering time This allows the beans to release their flavors and allows for a better extraction It 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 process are still crucial This is where the magic happens its what makes an espresso really taste great The grouphead also called the brewhead is where you place the portafilter the device that you put the grounds of coffee into when making espresso In the steamdriven espresso machine hot water is heated in an airtight container to create steam This then pushes the hot water through the grounds at high pressure They are less expensive and are 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 compressed airdriven espresso machines have been gaining popularity They utilize an air compressor to push hot water through the grounds and are far more portable than steamdriven electric machines