Leakage At The Packing, The Leakage Of The Pneumatic Sanitary Ball Valve, The Proportion Of The Packing Is The Largest.

Sanitary Ball Valve Reasons:
1. Wrong selection of packing, not resistant to corrosion by the medium, not resistant to high pressure or vacuum, high temperature or low temperature of the valve;
2. Wrong installation of packing, with defects such as small for large, poor spiral winding joints, tight top and loose bottom;
3. Packing has exceeded its service life, has aged, and lost its elasticity;
4. The valve stem is not precise, with defects such as bending, corrosion, and wear;
5. The number of packing turns is insufficient, and the gland is not tightened;
6. The gland, bolts, and other parts are damaged, making it impossible to tighten the gland;
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.

Maintenance methods:
1. The material and type of packing should be selected according to the working conditions;
2. The packing should be installed correctly according to relevant regulations. The packing should be placed and tightened circle by circle, and the joint should be 30℃ or 45℃;
3. The packing that has been used for a long time, aged, or damaged should be replaced in time;
4. The valve stem should be straightened and repaired after bending and wear, and the seriously damaged ones should be replaced in time;
5. The packing should be installed according to the specified number of circles, the gland should be tightened symmetrically and evenly, and the gland should have a pre-tightening clearance of more than 5mm;
6. Damaged glands, bolts and other parts should be repaired or replaced in time;
7. The operating procedures should be followed. Except for the impact handwheel, it should be operated with uniform speed and normal force;
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; if the gap between the gland and the valve stem is too large, it should be replaced.