原文：
根据使用条件，低温阀的设计有下列要求： 1） 阀门在低温介质及周围环境温度下应具有长时间工作的能力。 2） 阀门不应成为低温系统的一个显著热源。这是因为热量的流入除降低热效率外，如流入过多，还会使内部流体急速 蒸发，产生异常升压，造成危险。 3） 低温介质不应对手轮操作及填料密封性能产生有害的影响。 4） 直接与低温介质接触的阀门组合件应具有防爆和防火结构。 5） 在低温下工作的阀门组合件无法润滑，所以需要采取结构措施，以防止摩擦件擦伤。

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译文：
According to conditions of use, low-temperature valve design has the following requirements: 1) valve in the cold medium and the surrounding ambient temperature should have the ability to work long hours. 2) The valve should not be a low temperature system, a significant heat source. This is because the heat flow in addition to lowering thermal efficiency, such as excessive inflows, but also to the rapid internal fluid Evaporation, resulting in abnormal pressure, dangerous. 3) low-temperature media should not be rival operating and packing sealing performance wheel harmful effects. 4) direct contact with the cold medium valve assembly should have the explosion-proof and fireproof structures. 5) to work at low temperature lubrication of the valve assembly can not, so they need to take structural measures to prevent the friction parts scratches.