Single boiler heat exchange coffee machine-which continent does not grow coffee espresso 4m law

Single boiler heat exchanger coffee machine-which continent does not grow coffee Italian coffee 4m law

High pressure valve is a safety device, mainly to protect the safety of operators.

Main principle: When the water in the boiler is heated to generate pressure, and the pressure in the boiler reaches the preset steam pressure, the valve will be pushed open to start the pressure relief action, in order to avoid the pressure being too high and exceeding the pressure limit of the boiler itself.

low pressure valve

The low pressure valve is a valve set to maintain the normal operation of the coffee machine.

Main principle: avoid low pressure in boiler caused by temperature drop and air volume contraction in confined space. When reheating, the air expands faster than the temperature of the liquid due to metal heat conduction, so that the pressure sensing element misjudges the pressure in the boiler and stops heating.

discharge valve

Water unloading valve at the bottom of the boiler, mainly in the long-term start-up, keep the water fresh, clean the boiler scale, maintenance of the machine, the boiler water needs to be completely removed, then open the water unloading valve can be all the water in the boiler discharged.

The boiler of E61 (hereinafter referred to as the outer boiler) has a pipe (hereinafter referred to as the inner pipe) in the middle, which uses pumps to introduce fresh cold water into the inner curved pipe. When the pump pushes fresh cold water through this pipe, the cold water is heated by the hot water in the outer boiler, but the outer pipe is wrapped around, so that the fresh water does not come into contact with the hot water in the outer boiler. The inner water pipe is curved so that the cold water has enough time to contact the outer boiler and become the hot water temperature suitable for brewing coffee. Due to the circulation of hot water in the boiler, the temperature of each cup of coffee brewing is very close, whether it is one cup per hour. Or boil a hundred cups at once. In this way, not only can the temperature difference be reduced, but also the freshness of the water is taken into account, and the hot water in the boiler is only used to generate steam for making milk foam, and will not be used to brew coffee.

This is the principle of the single-boiler heat exchanger, until more than 30 years later, the internal structure and principle of most Italian coffee machines are still very close to FAEMA E61.

From the above explanation, we can infer that the larger the capacity of the external boiler, the lower the temperature difference of hot water brewing coffee, the more it can reduce the temperature difference caused by the use of steam.