以下为句子列表：
英文: A butterfly valve is generally 40% the cost of an iron gate. Not only low initial cost but low installation costs also.
中文: 一个蝶阀的成本通常只有铸铁闸阀的40%，不但购买成本低，而且安装成本也比较低。
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英文: A set of performance reliable products.such as type DBflanged butterfly valve,wafer butterfly valve and check valve ar widely applied to petrochemical industry.
中文: DB型法兰蝶阀、对夹蝶阀、止回阀等一批性能可靠的产品广泛应用于石化工行业。
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英文: Check valve and butterfly valve combinations are very popular; normally a short spool piece is required between the valves.
中文: 止回阀和蝶阀组装是很常见的，通常需要在阀门之间增加一段短管。
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英文: For the larger ball valves, as well as all butterfly valves, the appropriate butterfly valve handle and index plate are supplied for manual operation of the stem extensions.
中文: 对于用在所有球阀上的阀杆加长件，应该采用29240018齿轮操作机构和29241014驱动套管。
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英文: Hsieh Yu butterfly valve is designed for installation with square screw, nut and washer.
中文: 协羽的蝶阀安装设计是使用方形螺丝，螺母及华司所组成。
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