Valve body and valve cover leakage 1. Cast iron casting quality is not high, the valve body and valve cover body with trachoma, loose tissue, slag inclusions and other defects 2. Day freezing crack;
3. Bad welding, slag inclusion, non-welding, stress cracks, etc. 4. Cast iron valve damaged by damage caused by heavy objects (leakage of the valve, the proportion of filler is the largest)
1. The filler is not used properly, it is not resistant to the corrosion of the medium, it is not resistant to the use of high pressure or vacuum, high temperature or low temperature of the valve;
2. The packing is not installed properly, and there are defects such as small generation, large spiral coiled joints, and tight loosening.
3. Filler over the use period, has been aging, loss of elasticity 4. Stem accuracy is not high, there are bending, corrosion, wear and other defects 5. Insufficient number of packing rings, the gland is not compressed;
6. The cover, bolts, and other components are damaged so that the gland cannot be compressed;
7. Improper operation, excessive force, etc.
8. The cover is skewed, the gap between the gland and the valve stem is too small or too large, which causes the valve stem to wear, the packing to damage the leakage of the sealing surface, and the sealing surface is unevenly grinded to form an adhesion line;
2. The connection between the valve stem and the closing part is suspended, irregular or worn;
3, the valve stem is bent or improperly assembled so that the closing member is skewed or missing;
4. The quality of the sealing surface material is improperly selected or not used according to the working conditions. Leakage at the joint of the valve seal ring. 1. The seal ring is not tightly pressed. 2. The seal ring and the body are welded. The quality of the surfacing welding is poor;
3. Bad welding, slag inclusion, non-welding, stress cracks, etc. 4. Cast iron valve damaged by damage caused by heavy objects (leakage of the valve, the proportion of filler is the largest)
1. The filler is not used properly, it is not resistant to the corrosion of the medium, it is not resistant to the use of high pressure or vacuum, high temperature or low temperature of the valve;
2. The packing is not installed properly, and there are defects such as small generation, large spiral coiled joints, and tight loosening.
3. Filler over the use period, has been aging, loss of elasticity 4. Stem accuracy is not high, there are bending, corrosion, wear and other defects 5. Insufficient number of packing rings, the gland is not compressed;
6. The cover, bolts, and other components are damaged so that the gland cannot be compressed;
7. Improper operation, excessive force, etc.
8. The cover is skewed, the gap between the gland and the valve stem is too small or too large, which causes the valve stem to wear, the packing to damage the leakage of the sealing surface, and the sealing surface is unevenly grinded to form an adhesion line;
2. The connection between the valve stem and the closing part is suspended, irregular or worn;
3, the valve stem is bent or improperly assembled so that the closing member is skewed or missing;
4. The quality of the sealing surface material is improperly selected or not used according to the working conditions. Leakage at the joint of the valve seal ring. 1. The seal ring is not tightly pressed. 2. The seal ring and the body are welded. The quality of the surfacing welding is poor;
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