To get the right Espresso cup, baristas need to go through 3 stages with different pressure adjustments. In the article below, we will explore these 3 stages together with the powerful assistant of the coffee maker pressure valve . We invite you to take a look!
In this first stage , the pressure used is 9 bars. With this level of pressure, not only does it create a standard Espresso flavor and beautiful color, but it also creates a characteristic foam layer.
During this stage, the coffee maker pressure valve also creates spray pressure on the coffee powder layer, melting this coffee layer. To prevent coffee from clumping, creating grooves or clogging, you need to be a professional barista who knows how to properly adjust the pressure valve. Because any improper adjustment will cause espresso brewing to fail. In addition, the extracted coffee is not uniform, seriously affecting the smell and taste of espresso.
To increase the chance of success, baristas should start by adjusting the coffee maker pressure valve at a lower level, about 3 -4 bars for a few seconds and then gradually increase. This is also considered the coffee incubation time before extraction, helping to limit coffee grooves caused by incorrect pressure.
This is a stage that requires a lot of skills from the barista. They need to adjust the pressure valve up to 9 bars. Some coffee makers will skip stage 1 and go straight to this step. These are popular lines, without Pre-infusion phase.
This is the step towards the end of the process. During this period, the coffee maker pressure valve needs to be adjusted to 0, the coffee flow also gradually stabilizes. If the barista does not have professional skills, or encounters poor quality coffee maker pressure valves , you may feel the bitterness of the coffee due to the carbohydrates not being minimized. Thus, in any stage, the coffee maker pressure valve plays an extremely important role.