Do you love coffee? Do you know the one-way degassing valve?

Do you love Coffee? If you love coffee,you must know what is one-way degassing valve,would you mind share me what is your idea of one-way degassing valve? Just a little small plastic or it is important for coffee?  Thanks.

How many you know about the one-way degassing valve? 
Are they only the decoration on your coffee bags? 
If no,what is your idea about this one-way degassing valve,and what is the function for your coffee and you? 

We could like to learn more information and knowledge from you about the one-way degassing valve,we also would like to share our knowledge of the coffee valve or the different function and application of this one-way degassing valve to you.

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Email:  hebe@colorsuns.com