它还必须是抗冲击的，这就是为什么没有旋转介质存在的原因。
It must also be shock resistant, which is why no spinning media exists.
阀体材料是抗冲击的球墨铸铁，可在密封状态下将阀颈延长2英寸。
The valve body material shall be shock resistant ductile iron with extended neck for 2"of insulation."
所有异形制品在其使用温度范围内都有较低的收缩，并保持有高隔热、轻质和抗冲击的特点。
All the Ceramic Fiber Special-shape Products has the property of low shrinkage on heating, low thermal conductivity, light weigh and high impact strength.
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