Freshly roasted coffee beans may need a valve because they continue to release gas for some time after roasting.
Without a valve, this gas stays inside the closed pouch. A coffee valve allows the gas to escape while preventing outside air from entering. This helps prevent the pouch from swelling and helps keep the coffee fresh.
Not every coffee product needs a valve. It depends on when the coffee was roasted, how long the beans rest and when they are packed.
PouchDirect supplies coffee pouches with and without valves.