Common valve failures and troubleshooting methods

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Common Valve Failures and Troubleshooting Methods
Fault Symptoms | Causes of Faults | Troubleshooting Methods
Improper sealing of the seal ring: 1. Poor fit between the valve seat and the valve body. 1. Repair the seal ring. 2. Close the valve using improper tools, closing it too tightly. 2. Use appropriate force when closing the valve. Scratches, dents, or other defects on the sealing surface: 1. Dirt inside the valve body. 1. Remove and clean it. 2. Weld slag or rusty impurities have entered the valve body. 2. Grind the sealing surface. 3. Improper operation, with the valve body being opened too far. 3. Operate the valve correctly. Inflexible movement of the valve stem: 1. Incorrect selection of materials for the valve stem and bushing. 1. Replace them with materials that meet the requirements. 2. Insufficient lubrication. 2. Improve lubrication. 3. Thread wear or a misaligned valve stem. 3. Replace the valve stem and bushing. Leakage at the packing area: 1. Inappropriate type of packing used. 1. Add packing in stages. 2. Scratches on the valve stem. 2. Grind the valve stem until it is smooth. 3. Incorrect or dirty packing. 3. Replace it with high-quality packing. Leakage at the flange end face: 1. Damaged gaskets. 1. Replace the gaskets. 2. Scratches on the flange sealing surface. 2. Grind the sealing surface