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。
On True union Ball, Check and Diaphragm valves, remove union nuts and end connectors before priming and cementing connections.
YHX系列穿线盒是电缆穿管敷设时在套管连接处、电缆接头处、分支处必须采用的连接件。
YHX series threading box the necessary connecting piece at the junction of the casing, cable connector and branch when laying the cable.
包括阀门总成，不包括活接头螺母和端口连接件。
Includes valve assembly, less union nuts and end connectors.
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