Valve connection method according to classification: (1) threaded connection valve: body with internal or external thread, threaded connection with the pipe. (2) flange connection valve: body with a flange, pipe flange connection. (3) welding connection valve: body with a welding groove, and pipe welding connection. (4) clamp connection valve: body with a clip, and the pipe clamp connection. (5) ferrule connection valve: pipe and pipe connection. (6) on the folder connected to the valve: with a bolt directly to the valve and the two pipes through the folder
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