以下为句子列表：
英文: Series 774XDCDA contains two independently operating check valves located between two resilient seated shutoffs with four ball valve type test cocks and a hydraulically balanced metered bypass line to detect low flows.
中文: 系列774XDCDA包含两个独立运行的止回阀，位于两个弹性阀座关闭阀之间，并配置四个球阀型测试旋塞，以及一个液压平衡仪表旁路管线用于检测低流量。
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英文: The assembly shall consist of two positive seating check valves located between two resilient seated shutoffs with a hydraulically balanced bypass line and four test cocks.
中文: 这种总成应该由两个正向密封止回阀，两边夹着两个弹性阀座关闭阀，并配置一个液压平衡旁路管线和四个测试旋塞构成。
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英文: The bypass line double check valve shall have a single access cover, two independently operating modular poppet check valves, and top mounted test cocks.
中文: 旁路管线双止回阀应该具有一个检修盖，两个独立工作的运行模块化提升式止回阀，以及顶部安装测试旋塞。
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英文: The bypass line shall be hydraulically sized to accurately measure low flow.
中文: 旁路管线应该经过水力分析，能够精确测量低流量。
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英文: The bypass line shall consist of a meter, a small diameter double check assembly with test cocks and isolation valves.
中文: 旁路管线应该由一个水表，配置测试旋塞和隔离阀的一个小直径双止回阀总成构成。
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