What is the difference between a single valve and a double valve in a mocha pot? Is it necessary to buy a double valve for a mocha pot? What is the extraction principle of Mocha pot coffee?

It is the most suitable autumn and winter season for camping. In order to have a coffee addiction outdoors, many friends have started to buy mocha pots, which is the main reason why mocha pots suddenly became popular two years ago. But when friends open the mall, they will find that the mocha pot has the choice of single valve and double valve in addition to the brand and weight options.

"single valve and double valve?" Many friends do not know the difference between the two, so they stop here and dare not buy hastily. So today, Qianjie is going to share what is the difference between a single-valve mocha pot and a double-valve mocha pot, and in order to figure out the difference between them, we need to understand how the mocha pot works, because the double valve is based on the original. Add a "special device".

The principle of the mocha pot is still the same as this picture, from which we can directly understand the structure and principle of the mocha pot. The mocha pot is mainly divided into three layers: a bottom for hot water, a powder trough for coffee powder, and an upper pot with a filter.

The operation principle of the mocha kettle is very simple, that is, the use of water vapor to generate pressure to guide hot water for extraction! By heating the kettle, the water in the sink is converted into steam as it climbs to the boiling point. The presence of water vapor squeezes the space, forcing the hot water in the kettle to flow only up the pipe. The hot water is then extracted by passing through the coffee powder and eventually turned into a coffee liquid gushing out from the top outlet. (friends who need to know about the use of mocha pots can go to this article, "tutorials on the use of nanny mocha pots.") this is the extraction principle of mocha pot coffee, and it is also our most common single valve mocha pot extraction principle. And the double valve is on this basis to add a booster valve, that is, the device of the liquid outlet. (single valve on the left, double valve on the right)

The booster valve, as its name implies, plays a booster role. This booster valve deliberately narrows the gap and limits the "circulation channel" of coffee liquid. When the coffee liquid is too small to ooze, it will accumulate and form a blockage inside, thus achieving the pressurization effect! Pressure is one of the important extraction parameters of pressurized extraction such as mocha pot and Italian coffee machine. The higher the pressure, the higher the extraction efficiency. Since the existence of this booster valve will put more pressure on the mocha pot, that is to say, we can have higher extraction efficiency to extract coffee. Under the same extraction parameters, the coffee extracted with a double-valve mocha pot will have a concentration and extraction rate closer to that of espresso, and you no longer have to worry about making a latte because it is not strong enough to drink. And you don't have to worry that the taste of the coffee will be masked by milk.

Such a change is a very practical improvement for most people. The original single-valve mocha pot extraction pressure is not that high, so coffee powder will need to be the same as espresso, or closer to flour particles, which is not friendly for most handmill players.

Because the granules of the ground coffee powder are thicker, the concentration and extraction rate of the extracted coffee will be relatively reduced, and the taste is not so good. After the increase of pressure, even rough grinding can obtain a cup of coffee with considerable concentration and extraction rate because of the increase of pressure. In addition, because of the existence of this pressure valve, the extracted coffee is not only stronger, but also contains more coffee oil. As a result, at present, many merchants on the market will use the double-valve mocha pot to extract coffee oil as a selling point for publicity, such as using the double-valve mocha pot to make a more beautiful flower pattern.

In fact, the coffee oil extracted from the double-valve mocha kettle is not suitable for flower pulling! Because this layer of oil is different from the concentrated oil extracted by the Italian coffee machine, there is no delicate at all. It is the coffee liquid foam that is forced to form because the gap is too small. The foam is so rough that it will break and dissipate soon after it is extracted. Therefore, the effect of grease can only be used as a tactile improvement, not suitable for the production of flowers, and even hinder the production. Therefore, friends must not think too much about this layer of "grease".

But generally speaking, Qianjie will still recommend those who are going to buy a mocha pot to buy a double valve, because it is more inclusive and more applicable. And if there is no demand for milk coffee, just want to drink a cup of black coffee, then buy a single valve mocha pot is enough! After all, the price gap between the two is still relatively large (100 +), money still has to be used on the cutting edge!

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