online leak sealing technology in thermal power plant power plant valve is mainly used to control fluid run all kinds of equipment and piping, valve leakage often occurs in packing, flange seal and Industrial Valves body, valve leakage for a long time can cause the stem and flange sealing surface erosion, can make the valves scrap, plus the dielectric fluid valve online leak sealing technology in thermal power plant power plant valve is mainly used to control fluid run all kinds of equipment and pipeline, valve leakage often occurs in packing, flange seal and valve body, valve leakage for a long time can cause the stem and flange sealing surface erosion, and finally can make valves scrap, and a dielectric fluid loss, increase the consumption of power plants, rising costs, economic benefits drop. If the toxic, flammable, explosive, corrosive medium fluid such as external leakage, is easy to poisoning, fire, explosion and other injuries and speed up the factory equipment corrosion, shorten its service life, serious environment pollution and destruction of electric power production, harm people's health. Leakage of the existence of serious threat to safety production, increase in the number of unplanned outage power plant. Here introduce some valve leakage reason and its method, and method of repair and maintenance of the valve for your reference. 1: valve leakage of valve leakage and the reasons of the filler valve form and factors in the process of operation, there is relative motion between stem and packing, it includes the rotation and axial movement. With the increase of switching frequency, the number of relative motion has said, as well as temperature, pressure and fluid characteristics, the valve packing is the most easy to leak. It is due to the packing of contact pressure, packing their own aging, lost caused elastic. When the pressure medium will outward along the packing and the valve stem of the contact clearance leakage, long time will blow away part of the packing and the valve rod flushed out of the groove, so that the leakage expansion. 2: flange leak valve flange seal is mainly rely on the connection bolt pre-tightening force, achieve enough through gasket sealing pressure, to prevent fluid leak sealed pressure. The causes for the leakage of it, there are many aspects of the sealing gasket compression force is insufficient, in combination with surface roughness is not in conformity with the requirements, the gasket sealing gasket deformation and mechanical vibration can cause combined with flange surface or lax and leakage. Additional bolt deformation and elongation, gasket aging, resilience, crack, could also cause flange surface and untight seal leakage. Leakage of flange and the man-made factors which cannot be ignored, such as sealing gasket partial, make excessive insufficient local sealing pressure force, more than the sealing gasket design limits, in the process of the flange clamp and uneven or two flange centerline offset, such as false tight phenomenon are easy to leak. 3: the leakage of the valve body and cause the body is due to the leakage causes of Industrial Valves casting or forging defects in the production process, such as sand holes, porosity, crack, etc. , and fluid scouring and corrosion is caused leakage of the Industrial Valves body. 3. 1 the principle of online leak sealing principle of online leak sealing is in a liquid medium under the dynamic condition, solid sealing mechanism of the sealing material for basic basis. Leaking location method is considering installing special equipment, the use of a chamber formed between the sealing parts and special equipment, the use of special high pressure injecting tools will inject chamber sealant, and fills the chamber space, make the sealant extrusion pressure and leakage of medium pressure phase equilibrium, a new seal structure to plug leaks pore channel, blocking leakage of medium. 3. 2 the advantages of online leak sealing reduces the social and economic losses. Starting: http://www. zzfmzz。 com/
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