Leakage of valve body and bonnet 1. The casting quality of cast iron parts is not high, and there are defects such as sand holes, loose structure and slag inclusion on the valve body and bonnet body.
3. Poor welding, there are defects such as slag inclusion, unwelded, stress cracking, etc. 4. The cast iron valve is damaged by the impact of the heavy object (the outer leakage of the valve, the proportion of the filler is large)
1. The filler is not selected correctly, it is not resistant to the corrosion of the medium, and is not resistant to the use of high pressure or vacuum, high temperature or low temperature of the valve;
2. The filler is not installed correctly, and there are defects such as small generation, poor spiral coiled joints, tightness and looseness;
3. The filler has exceeded the service life, has aged, and lost its elasticity. The valve stem has low precision and has defects such as bending, corrosion and wear. The number of packing rings is insufficient, and the gland is not pressed;
6. Damage to the gland, bolts, and other components so that the gland cannot be pressed;
7. Improper operation, excessive force, etc.;
8. The gland is skewed, the gap between the gland and the valve stem is too small or too large, causing the valve stem to wear, the packing damages the leakage of the sealing surface, the sealing surface is unevenly ground, and the tight line cannot be formed;
2. The top of the joint between the valve stem and the closing member is suspended, not worn or worn;
3, the valve stem is bent or improperly assembled, so that the closing member is skewed or not in the middle;
4. The quality of the sealing surface material is improperly selected or the leakage of the valve sealing ring is not selected according to the working conditions. The sealing ring is not tightly pressed. 2. The sealing ring is welded to the body. The quality of the welding is poor. The third precision valve technology department provides
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