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NRV valve is also known as a one-way valve or check valve. This is a type of valve that allows fluid to flow in one direction only. These valves work by opening when fluid flows forward but it closes when the fluid flows backward or when the fluid tries to reverse the direction of flow.

NRV是英文nutrient reference values的首个字母的缩写，翻译成中文是“ 营养素参考值 ”，是“中国食品标签营养素参考值”的简称。 “营养素参考值”是专门用于食品营养标签的一项内容，是用来比较食品营养成分含量多少的一组参考值，是消费者选择食品时的一种 ...

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2016年8月20日 · NRV意为营养素参考值。%是单位。是食品营养标签上比较食品营养成分含量多少的参考标准，是消费者选择食品时的一种营养参照尺度。简单的说就是： 指每100g（毫升）食品中总能量以及各种营养素占我们一天人体所需的百分比。

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