Gate valve packing leakage of eight cases: 1. Improper operation, excessive force, etc .; 2. Packing ring is insufficient, the gland is not compressed; 3. Filler over the use of aging, loss of elasticity; 4. Valve stem accuracy Is not high, there is bending, corrosion, wear and other defects; 5 packing is not installed, there is a small generation, there are poor spiral wound joints, tighten the loose and other defects; Glands, bolts, and other parts damage, Cover can not be compressed; 7. Fillers use the wrong, the impatience medium corrosion, impatience valve high pressure or vacuum, high temperature or low temperature use; 8. Gland skew, gland and stem gap is too small or too large, Stem wear, packing damage.
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