The machine is an important factor in making coffee or espresso coffee with a delicious crema, but the one way exhaust valve says that in addition to the machine, the crema formula is also very important.
The golden foam crema on coffee is made up of countless oils, proteins and various sugars. The formula determines the coffee quality, the more grease the coffee formula contains, the more unstable the crema. For this reason, espresso coffee is often mixed with some Robusta coffee beans, because these beans are associated with about 16% high-quality fat. If the coffee cup is unclean and the grease remains on the inside of the cup wall, the crema will quickly subside as the surface tension decreases.
When you or your customer have high requirement on the coffee kit, please also remember to have your coffee bean packed with a coffee valve without filter.
Brewing methods have different requirements on the powder thickness, exhaust valves without filter is suitable for whole-bean product that can be grinded at home.
Brewing method and the storage condition are both affecting coffee taste, and the exhaust valve with filter installed on package is suitable for powdery product.
We recommend you keep coffee beans in containers with one-way degassing valve, it helps to prevent quality change and to extend shelf life during ‘resting’.