►Reasons for Leakage:

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

2. Packing installation is not right, there is a small instead of large, spiral coiled joints are bad, on the tight down loose and other defects;

3. Packing more than the use of the period, has been aging, loss of elasticity;

4. The valve stem is not accurate, with defects such as bending, corrosion, wear and tear;

5. Insufficient number of packing circle, the gland is not pressed;

6. Damage to the gland, bolts, and other parts, so that the gland can not be pressed;

7. Improper operation, excessive force, etc;

8. Skewed gland, too small or too large a gap between the gland and the valve stem, resulting in stem wear, packing damage.

►Maintenance method:

1. The material and type of packing should be selected according to the working conditions;

2. According to the relevant provisions of the correct installation of packing, packing should be placed by circle pressure, joints should be 30 ℃ or 45 ℃;

3. The packing with long service life, aging and damage should be replaced in time;

4. Valve stem bending, wear and tear should be straightened, repair, serious damage should be replaced in a timely manner;

5. Packing should be installed according to the specified number of laps, the gland should be symmetrically and uniformly tightened, and the pressure sleeve should have a preload clearance of more than 5mm;

6. Damaged gland, bolt and other parts should be repaired or replaced in time;

7. Operation regulations should be observed, except for the impact handwheel, to operate at an even speed with normal force;

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

Valves are Installed on the Ship: