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pressure-relief valve /ˈpɹɛʃəɹɪlˈiːf ˈvalv/ n

中文：减压阀

中文 · 减压阀Español · válvula de alivioFrançais · soupape de sûreté
Meaning：Mechanism for releasing pressure by letting off excess water or steam.
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Found in these illustrated scenes（3）

Oil-fired water boiler Electric water heater tank Gas water heater tank

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