Causes: 1, selection of packing is wrong, no resistance to corrosion medium, not resistant to high pressure or vacuum Industrial Valves, the use of high and low temperatures; 2, packing installation is wrong, there is a generation with a little one for a big, spiral wound joints, tighten the loose defects such as; 3, packing more than life, have aging, loss of elasticity of 4, the valve stem precision is not high, a bending, 5 defects such as corrosion, wear, packing ring, gland not compaction; 4, gland, bolts, and other components damaged, make gland cannot compress; 5, improper operation, too hard, etc. ; 6, gland skew, gland and the gap between the stem is too small or too large, the valve stem wear and damage of the packing. Prevention and elimination method: 1, should according to the working condition choose packing materials and type; 2, according to the relevant provisions of the correct installation packing, packing should be by circle put pressure, joint should be 45 ℃ to 30 ℃ or; 3, life is too long, aging, damage of packing should be replaced in a timely manner; 4, the stem should be into straightening after bending, wear, repair, the badly damaged should be replaced in a timely manner; 5, packing shall be installed in a specified number of turns and gland should be symmetrical evenly the tight, pressing sleeve should be preloaded gap more than 5 mm; 6, the damaged gland, bolts and other components, should be timely repair or replacement; 7, shall comply with the operational procedures, in addition to the percussive handwheel, normal force at a constant speed operation; 8, should be symmetrical tighten gland bolts evenly, gland and the gap is too small, the stem should be appropriate increase its clearance. Gland and stem gap is too big, should be replaced.
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