On True union Ball, Check and Diaphragm valves, remove union nuts and end connectors before priming and cementing connections.
对于真活接球阀、止回阀和隔膜阀，在上底漆和粘固剂连接之前，先拆卸活接头螺母和端口连接件。
It consists of prefabricated steel tubes, which are screwed into forged steel connectors, the so-called MERO ball.
它由预制管材及被拧紧进锻造的钢连接器组成，即所谓的MERO球。
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