1. Carefully check the quality of the flanges, bolts, nuts and gaskets before the device, carefully check the condition of the flange or interface device, and whether there are any disadvantages such as apex, wrong mouth, open mouth and wrong hole.
2, PTFE gasket can not be biased, should ensure uniform pressure.
3. Apply even force when tightening the nut. The bolt should be symmetrical and evenly divided into 2 times - 3 times to make the gasket evenly pressed.
4. It is necessary to clean the surface of the flange or the sealing part. The surface of the gasket and the bolts and threads are not allowed to adhere to mechanical impurities.