1. Defect characteristics
Unfused refers to the phenomenon that the weld metal is not completely melted and bonded with the base metal or between the layers of the weld metal.
Failure to penetrate ...
How check valve works
The check valve is used in the pipeline system, and its main function is to prevent the backflow of the medium, the reverse rotation of the pump and its driving motor, and the...
1. Hydrstatic test at negative temperature during construction in winter.
Consequences: because the tube freezes quickly during the hydraulic test, the tube is frozen.
Measures: try to carry out hy...
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Gate valves and butterfly valves are used as switches to regulate the flow rate in pipeline use. Of course, there are still methods in the selection process of butterfly valves and gate valves.
In ...
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