以下为句子列表：
英文: A Double Check Valve Assembly shall be installed at each noted location to prevent the unwanted reversal of polluted water into the potable water supply.
中文: 双止回阀总成应该安装在每个值得注意的位置，用于防止污水出现不需要的回流而流进饮用水供应系统中。
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英文: A double check valve assembly shall be installed at each noted location.
中文: 双止回阀总成应该安装在每个指定的位置。
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英文: By deenergizing of coil, control air moves the single-acting cylinder to the stop position through the pipe named “SUPPLY”, the double check valve (pos. no. 72-2), the 3-way magnet valve (pos. no. 77, lower frame) and the 3-way valve (pos. no. 78, lower f
中文: 通过其线圈断电，控制空气移动单作用汽缸到停止位置通过SUPPLY管路，双向截止阀72-2，三通电磁阀77下位和三通阀78，下位。
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英文: Double Check Valve Assemblies shall consist of two positive seating check valves located between two resilient seated shutoffs with four ball valve type test cocks.
中文: 这种双止回阀总成应该由两个正向密封止回阀，夹在两个弹性阀座关闭阀之间，并配置四个球阀型测试旋塞构成。
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英文: Only those cross-connections identified by local inspection authorities as non-health hazard shall be allowed the use of an approved double check valve assembly.
中文: 只有那些经过当地有关检查主管部门认定为非健康危害的交叉连接才应该允许采用经过认证的双止回阀总成。
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