阀座材料应该是下列材料之一：乙烯-丙烯-二烯系单体或氟橡胶，在顶部和底部配置聚四氟乙烯轴承支撑。

The seat material shall be one of the following materials: ethylene-propylene-diene monomer or fluoroelastomer with polytetrafluoroethylene bearing support at the top and bottom.

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根据我国镍系顺丁橡胶的生产数据和工艺方案，对釜式丁二烯聚合工艺进行了动力学分析和工程分析。

Based on the practical data and operation program, both kinetic and engineering analyses of nickel catalyzed butadiene rubber production by tank reactor in China were reviewed.

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以镍系催化剂为例，考察了溶解氧对丁二烯聚合系统的影响，并考察了使用升压器后的作用效果。

Taking nickel catalyst system as an example, the effects of dissolved oxygen on butadiene polymerization and the result of using the pressure-self-raising-unit were analyzed.

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