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Important Parts of an Espresso Machine A high-quality espresso machine will make a shot of coffee with a firm body that has a full flavor and an strong aroma. This requires a high level of temperature and pressure. You must also pay attention to the crema, a golden brown layer that gives a rich espresso its distinctive color and taste. There are four major kinds of espresso machines: manual, semi-automatic automatic, super-automatic and semi-automatic. Water reservoir The water reservoir is a container in which you can store chilled, purified water that is fed into the espresso machine. It is usually removable, and has a lid to keep the water free of dust and dirt. It is an important part of an espresso machine, and should be kept clean to avoid getting blocked. Pour vinegar into the reservoir to clean it. Let it run for a while. The espresso machine makes use of water to pressurize coffee grounds to extract flavors as well as caffeine, oils and flavor. It also produces crema, the foam. Achille Gaggia designed the first espresso machines, which utilized pistons and levers to create high-pressure brewing. Gaggia's spring piston levers moved water through the coffee into the cup. This introduced a brand-new language called “coffee crème” (crema). The pump is an electrical device that is used to push the water through the heating element to bring it up to the ideal temperature for brewing of 195 degrees Fahrenheit. It is usually situated at the bottom of the machine and is connected to a tube that goes up through the heating element. The tube is connected at either end to both the cold-water and hot-water tubes. It also connects to the heating elements of resistance which are coated with white grease to keep the plate warm. Pump The pump is the thing that makes espresso machine work, and there are several kinds. Some machines employ a vibration pump or a vibratory pump which makes use of an electromagnetic motor that moves back and forth in a coil with 60 pushes per sec. The pump pushes water into the portafilter and then out of the spouts. Some pumps employ a thermoblock or thermocoil heating system that will precisely heat the water to the desired temperature for brewing. These systems also allow the control of water pressure and temperature, which are crucial to a successful extraction. Pump-driven espresso machines can employ a spring, piston or electric pump. However, all require that water be moved through the coffee grounds at high pressure. The higher the pressure, the more flavorful the extraction. The pump makes sure that the coffee ground is evenly distributed, which helps create a great crema. Steam-driven and piston-driven espresso machines are also available. In a steam-driven machine, the water is forced through the coffee using steam pressure. This kind of espresso machine is less expensive, but doesn't produce as much pressure for the extraction. There are also air-pump-driven espresso machines that are smaller and lighter but do not require a boiler and can be powered by a hand pump or a canister filled with compressed air (such as CO2 or N2). Air-pump espresso machines produce less pressurized espresso than pumps-driven machines, but can be more convenient for some people. Steam Wand The steam wand is a thin metal pipe that shoots hot steam pressurized into your milk for foamy drinks such as Lattes and cappuccinos. The wand can be used to warm cocoa, tea, or other hot drinks. The wand is usually made of several holes on its tip, which you can turn on and off to regulate how much steam is released. Certain machines come with traditional wands, while others use a Pannarello wand, which is simpler to operate but doesn't create the same foam that is needed for the latte art. If you're having problems in frothing milk, it might be because your espresso machine has a problem with its anti-vacuum device. This valve is designed to stop air from leaking into the steam wand during operation. You can test it by lower the steam wand and watching for a whirring sound. If you hear this noise it indicates that air is being drawn in, and you should raise the wand a bit to submerge it more fully. You can also test the anti-vacuum method by removing the wand, and cleaning it in warm water with a soft bristled brush or sponge. It is important to keep the wand clean to prevent clogs, which could affect your foaming. If you're unable to fix it on your own, consult a technician or a manufacturer. Control panel The control panel of an espresso machine permits the user to set up and modify settings. These include coffee strength as well as milk volume. Related Homepag can be changed at anytime. The display also indicates when the machine needs to be descaled and shows whether the tank is full. The majority of espresso machines have hot water dispensers, either in one of the groups or between them. It can be used to make tea or heat cups, depending on the need. It is also useful for cleaning and rinsing. Many models feature pressure gauges that indicate the current boiler pressure. There is also a brew switch, that controls the brew cycle and the amount of shots. This is crucial because espresso shot size is determined by the amount of time that the grounds are in contact with the water. If desired, the switch can be used to begin the steaming process. The control system on this espresso machine may be a bit old-fashioned, yet it has a user-friendly interface. It has a slim LCD screen that looks more like an LED. It is simple to navigate through the menus. However there is a small learning curve for those who are unfamiliar with the use of espresso machines. The stability of the temperature is also impressive. It can maintain a consistent water temperature between 194deg – the 208 degree F throughout the entire making process. This ensures a perfect extraction of aroma, and a high-quality cup each time.