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 check valve may be required ahead of the backflow preventer.
中文: 此时在防回流阀前面可能需要安装一个止回阀。
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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: 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: 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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