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One-way valve
Let us give you a hand with easily understanding the word one-way valve and what it means here in the coffee world.
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What is a one-way valve?
One-way valves, also called check valves, allow water and steam to flow in one direction only, preventing backflow from the boiler to the pump and water supply.
A one-way valve can also be the valve on the coffee bag that helps release CO2 from the coffee beans.