Connector refers to two or more containers that are interconnected below the liquid level and have equal pressure above the liquid level, with equal liquid level height and the same liquid.

Flat welding: only the outer layer is welded, not the inner layer; It is generally used in medium and low pressure pipelines, and the nominal pressure of the pipeline shall be lower than

Flange connected valves and pipelines are easy to install and disassemble, but flange connected valves are heavier than threaded valves, and the corresponding price is also high, so it is suitable for pipe connection of various diameters and pressures. When the temperature exceeds 350 ° C, the thousand bolts, gaskets and flanges will become loose, which will also significantly reduce the load on the bolts and may cause leakage to the flange connection under great stress.