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Leakage at valve packing and solutions

Issuing time:2021-10-30 15:39

Reasons for leakage at the valve packing

1. Incorrect selection of fillers, not resistant to medium corrosion, not resistant to valve high-pressure or vacuum, high or low temperature use;

2. The installation of the filler is incorrect, with defects such as replacing the large with the small, poor spiral wound joints, and loose upper and lower parts;

3. The filler has exceeded its service life, aged, and lost its elasticity;

4. The valve stem has low accuracy and defects such as bending, corrosion, and wear;

5. Insufficient number of packing rings and incomplete compression of the gland;

6. Damage to the gland, bolts, and other components, making it unable to be tightened;

7. Improper operation, excessive force, etc;

8. The gland is tilted, and the gap between the gland and the valve stem is too small or too large, resulting in valve stem wear and packing damage.

Prevention and elimination methods:

1. The materials and types of fillers should be selected according to the operating conditions;

2. Install the packing correctly according to relevant regulations, place and compress the packing ring by ring, and the joint should be at 30 ℃ or 45 ℃;

3. Fillers with long service life, aging, or damage should be replaced in a timely manner;

4. After the valve stem is bent or worn, it should be straightened and repaired, and those severely damaged should be replaced in a timely manner;

5. The filler should be installed according to the specified number of turns, the gland should be tightened symmetrically and evenly, and the pressure sleeve should have a pre tightening gap of more than 5mm;

6. Damaged glands, bolts, and other components should be repaired or replaced in a timely manner;

7. Comply with operating procedures and operate at a constant speed with normal force, except for impact handwheels;

8. The gland bolts should be tightened evenly and symmetrically. If the gap between the gland and the valve stem is too small, the gap should be appropriately increased;

9. The gap between the gland and the valve stem is too large and should be replaced.


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