The main feed water system control valve of nuclear power leakage defect analysis and measures

Regulating valve plant main feed system is composed of the main valve and bypass valve, in order to adjust the water level of steam generator, during the period of unit operation, often appear this kind of valve media from the valve stem leakage phenomenon, cause great hidden trouble to the safe and stable operation of the unit, according to the principle of the valve stem seal, analyzes the cause of leakage, is put forward to V graphite packing with carbon fiber woven packing combined way of packing, the chemical properties of the materials and physical properties can satisfy the requirements of nuclear grade, combined with proper installation, finally solve the defect of the packing seal leakage. (authors)