Leakage and solution at the valve packing

Reasons for leakage at the valve packing
1. The filler is not used correctly, it is not resistant to the corrosion of the medium, and is not resistant to the high pressure of the valve or the use of vacuum, high temperature or low temperature;
2, the filler installation is wrong, there are defects such as small generation, spiral coiled joints, tight and loose
3, the filler exceeds the use period, has aged, lost flexibility
4, the valve stem accuracy is not high, there are defects such as bending, corrosion, wear, etc.
5. The number of packing rings is insufficient, and the gland is not pressed;
6. The gland, bolts, and other components are damaged, so that the gland cannot be pressed;
7, improper operation, excessive force, etc.;
8. The gland is skewed, and the gap between the gland and the valve stem is too small or too large, causing the valve stem to wear and the packing to be damaged.
Prevention and elimination methods:
1. The materials and types of fillers should be selected according to working conditions;
2. According to the relevant regulations, the packing should be installed correctly. The packing should be placed in a ring-by-turn manner, and the joint should be 30 ° C or 45 ° C;
3. Filling materials that are too long, aging and damaged should be replaced in time;
4. After the valve stem is bent and worn, it should be straightened and repaired. If the damage is serious, it should be replaced in time;
5, the packing should be installed according to the specified number of turns, the gland should be tightly and symmetrically tightened, and the press sleeve should have a pre-tightening clearance of more than 5mm;
6. Damaged glands, bolts and other components shall be repaired or replaced in time;
7, should abide by the operating procedures, in addition to the impact type hand wheel, operate at a constant speed normal force;
8. The gland bolt should be tightened evenly and symmetrically. The gap between the gland and the valve stem should be too small. The gap should be increased properly. The gap between the gland and the valve stem should be too large and should be replaced.