A decompression valve for flight cases is a device that allows air pressure to equalize between the inside and outside of the case during changes in altitude. This helps to prevent the case from being damaged or breaking open due to the pressure difference that can occur during air travel. The valve is typically located on the side or top of the case and can be either manually operated or automatically. The decompression valve allows air to flow in or out of the case as the pressure changes, maintaining a safe and stable internal pressure, which protects the contents inside the case.

　　The use of a decompression valve for flight cases is to ensure the safe transport of the contents of the case during air travel. As the altitude changes during a flight, the pressure inside the cabin changes as well, and if this pressure is not equalized with the pressure outside the case, it can cause the case to become damaged or even break open. The decompression valve allows air to flow in or out of the case as the pressure changes, maintaining a safe and stable internal pressure. This ensures that the contents of the case are protected from damage during transit. Additionally, it can also be used in other situations where the pressure changes, such as when the case is transported in a cargo hold of a ship or train.

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