以下为句子列表：
英文: On top of one of the fast-opening ends that closed to the pig receiver &launcher shall assemble vent valve, safety valve and pressure gauge, and at the bottom shall assemble drain valve, sideway inlet and vent valve to take out medium from the main pipe a
中文: 靠近收发球筒快开盲板一端上部应设防空阀、安全阀及压力表、下部设排污阀、侧面设进、出油（气、水）阀，以便从干管中取介质作为驱动清管器的动力及输出介质。
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英文: To prevent valve from damage, the manual operated soft-sealing gate valve should be operated by hand.
中文: 为防止损坏阀门,手动软密封闸阀只能以人力直接操作手轮。
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