In many industrial sectors such as petrochemicals, power generation, and water conservancy, the sealing reliability of valves and rotary pump shafts directly affects production safety and efficiency. As a critical sealing component, the correct cutting and installation of packing (also known as sealing packing) is a fundamental skill for preventing leaks and extending equipment lifespan. A recent survey on factory equipment maintenance showed that nearly 30% of early packing failures stemmed from improper installation.
When cutting, it is strictly forbidden to directly wrap the packing around the shaft, as this will lead to length errors and cut deformation. The correct method is:
1. Tightly wrap the packing around a mandrel or old shaft with the same diameter as the equipment shaft (valve stem or pump shaft).
2. Using a sharp blade, cut cleanly and decisively at a 45-degree angle in one go. The 45-degree bevel cut ensures that each packing ring forms a tight beveled overlap after mating, effectively blocking the leakage path.
"Proper installation is the guarantee of a good seal."
1. Before installation, thoroughly clean the stuffing box to remove any old packing residue and check that the shaft surface is smooth and free of wear.
2. Then, install the cut packing rings one by one into the box. Two key points must be noted during installation: First, after each ring is installed, use a dedicated compression sleeve or suitable tool to evenly and fully compact and flatten it, ensuring it is in place and preventing loosening or twisting. Second, the cut positions of adjacent packing rings must be staggered by 90 to 180 degrees to disperse the gaps and further seal leakage channels.
3. After all rings are installed, tighten the gland bolts symmetrically and evenly to the torque specified in the manual.
Packing installation is not "the tighter the better." After initial installation, a trial run should be conducted. A small amount of leakage is permissible initially to lubricate and cool the packing. After the packing has adapted, gradually tighten the gland bolts in stages, adjusting to the ideal state where only fine drips or no obvious leakage occur. A standardized "cutting-installation-adjustment" process is an indispensable maintenance technique to ensure the long-term stable operation of equipment.
For more products, please visit it tenglongsealingss.com
Welcome to mail:sales@sealings.cn or call 0574-62837600
