To lose control of the valve material, valve shaft from stainless steel ANSI420.

用于输料管的阀门，阀轴由ANSI420不锈钢制造。

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Be sure to use proper valve material-types for both temperature and chemical resistance.

确保采用与温度和耐化学性相匹配的材质的阀门。

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The physical property and mechanical performance must be considered when selecting the valve material.

在材料选择时必须考虑材料的物理性质和机械性能。

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That starts off with a "junk shot, " in which material such as rubber tires and golf balls is pumped into the shut-off valve, or blowout preventer, that sits atop the well.

WSJ: Spill Fight Shows Progress