• Valve Packing Leakage Valve Cause of Failure 1. Packing gland is not compressed 2. Packing is invalid due to use or improper storage Failure method 1. Tighten the nut evenly to compress the packing 2. Replace the packing · Sealing surface leakage between the valve failure reasons 1. sealing surface contaminated attachments 2. sealing surface damage troubleshooting methods 1. Clean the contaminants 2. rework finishing or replacement · valve body and bonnet junction Leakage valve failure reasons 1. Uneven fastening bolts 2. Flange sealing surface damage 3. gasket rupture failure or failure to eliminate 1. Uniform tighten 2. Reshape 3. Replace the gasket · hand wheel rotation Inflexible or valve not open and close Reason for valve failure 1. packing is too tight 2. packing plate, crook device skew 3. stem nut is damaged 4. stem nut thread serious wear or tear 5. valve Rod bending failure to eliminate 1. Loosen the nut on the packing plate 2. Correct the packing plate 3. Disassemble the thread and remove contaminants 4. Replace the stem nut