以下为句子列表：
英文: At present, China's valve industry is still some problems still exist, such as China's main valve business to low-level, small-scale, family-based enterprises workshop.
中文: 目前，我国阀门行业仍然还存在着一些问题，如目前我国阀门企业主要以低层次、小规模、家庭作坊式企业为主。
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英文: Series B includes lines conveying gases or liquids where bypassing may facilitate the operation of the main valve through balancing the pressure on both sides of the disc (or discs).
中文: 系列B包括输气或输液管道，通过平衡阀瓣两边的压力使得主阀门运行容易。
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英文: Service of all internal check valve components shall be through top mounted access covers threaded to the main valve body.
中文: 所有止回阀内部部件的维修应该能够通过顶部安装的检修盖进入进行，这种检修盖应该通过螺纹固定在主阀门阀体上。
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英文: The check valves shall be modular and shall seal to the main valve body by the use of an O-ring.
中文: 这种止回阀应该是模块化的，并通过O形环密封连接到主阀阀体上。
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英文: The main valve body shall be manufactured from 300 Series stainless steel to provide corrosion resistance.
中文: 主阀阀体应该采用具有耐腐蚀性能的300系列不锈钢制造。
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