Sealing Technology for Thermal Power Plant Valve Pressure
Power plant valve is mainly used for control of various equipment and its control on the road fluid medium of operation, the valve leakage often occurred in the filling, sealing and the valve flange, the valve leakage can cause a long stem and flange sealing surface erosion, which will ultimately enable the valve scrapped, coupled with the loss of fluid medium, so that power consumption increased, rising costs, economic decline. Medium fluid, if toxic, flammable, explosive, corrosive, etc. outside the leak occurred, then prone to poisoning, fires, explosions and other casualties and accelerate the corrosion rate of plant and equipment and shorten its life, and in severe pollution of surrounding environment, destroying the power production and damage to people's health. There is a serious threat to the leakage of safety in production, so that power plants increased incidents of unplanned downtime. The following are some causes of valve leakage and plugging methods and the right valve repair and maintenance methods, for reference.
2 valve leakage in the form of and factors
2.1 The valve packing leakage and the reasons for
Valve in operation during use, the stem with the relative movement exists between the filler, which includes rotation and axial movement. As the switching frequency increases, the number of relative motion also will be increased, as well as temperature, pressure and fluid characteristics of the medium such as the impact of the valve packing is the most prone to leak the site. It is the contact pressure due to the gradual weakening filler, filling their own aging, loss of elasticity causes. Then the pressure medium will be along the gap filler out of contact with the valve stem leaks, blown away a long time that some of the fill and will stem carve out grooves, so that leakage of magnification.
2.2 Flange leak
The valve connecting flange sealing relies mainly on the preload bolt, through the sealing gasket to achieve more than enough pressure, the pressure to be sealed to prevent leakage of fluid medium. There are many reasons it is leaking, the sealing gasket of the lack of compaction force, combined with surface roughness does not meet the requirements, gasket distortion and mechanical vibration, such as would give rise to sealing gasket and flange surface density combined with lax and happened leakage. Another deformation or elongation of bolts, gaskets aging, resilient fall can also cause cracks and other flange Mifengbuyan the leak. Flange leak there can not be ignored human factors, such as the sealing gasket mounted side, so that partial pressure less than the tight seal of excessive force, exceeding the design limits of the sealing gasket, as well as the uneven force during fastening flange or two France Lan centerline offset, resulting in the phenomenon of pseudo-compact and so prone to leaks.
2.3 The valve body and cause of the leakage
The main reason is due to the leakage valve valve production process caused by casting or forging defects, such as trachoma, pores, cracks, etc., and flushing fluid medium and gas valve leak caused by corrosion is also a common factor.
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