Packing leakage and body and bonnet joint leakage ( 1) Packing leak leakage and reason: packing seal principle that axial force on the packing, packing produce plastic deformation, the Industrial Valves due to multiple packing installation, parts of the alternate contact each other, forming 'maze effect', have the effect of prevent leakage of pressure medium. Packing leakage in addition to the pressure and the medium under different penetration, packing contact pressure is not enough, and the ageing of the packing itself, partly due to the strain of the valve stem. Packing on the valve stem corrosion, so when the pressure medium along the contact space between the packing and the Industrial Valves stem to leak, until the leakage from the packing, and improper operation, overexert stem bending. Packing improper selection, resistance to corrosion medium, resistance to high pressure or vacuum and high temperature and low temperature. Packing more than life, have been aging, loss of elastic filler installation inadequate treatment methods: should be according to the working condition choose packing type and materials; Preloaded packing, correct installation and determine the number of packing; Stem bending, the surface corrosion of mechanical repair or replacement; The packing failure must be replaced.
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