freeze protection valve
A valve designed to prevent freezing in pipes or equipment, typically used in cold climates or refrigeration systems.
寒冷地では、水道管に不凍栓を取り付けることが推奨されます。
In cold regions, it is recommended to install freeze protection valves on water pipes.
Compound of 不凍 (freeze-proof) and 栓 (valve, plug). The exact historical derivation is uncertain; the term is a modern technical coinage.