leakage: the equipment under normal working pressure, disc and seat sealing surface occurred more than allow degree of leakage, the valve leakage not only causes loss of medium. In addition, the dielectric constant leakage will cause the hard sealing material was damaged, but the commonly used control valve sealing surface is metal to metal material, while trying to do is bright and clean level off, but in the medium with pressure circumstances do not leak is also very difficult. Therefore, for regulating valve is combustible or flammable medium, under prescribed pressure value, if the use of professional test tools, test as to standardize the permission scope, sealing performance can be thought of as qualified. General causes of the leakage of valve has the following three conditions: one is the sundry fall on sealing, the sealing surface mat, causing a gap between valve core and valve seat, valve leakage. Method of eliminating the fault is cleared to drop to the sealing surface of sundry, general maintenance in pressure vessel size, first of all do pressure vessel safety door run lead test, found leakage, stop working pressure vessel and the valve repair, scour on sealing surface. Second, the sealing surface damage. The main reason for the sealing surface damage has the following points: one is the bad sealing surface material. Due to years of use, the Industrial Valves core and valve seat sealing surface has been developed very generally low, and make the sealing surface hardness also greatly reduced, thus cause the loss of sealing performance, the best way to eliminate this phenomenon is the original seal face turning down, then according to the drawing requirements to welding processing, improve the surface of the sealing surface hardness. Note must ensure the quality of processing, in the process of machining, defects such as cracks on sealing surface, trachoma, must be reprocessed after turning it down. A new processing of valve core seat must conform to the requirements of the drawings. Second, the poor quality of repair, valve core seat grinding can not meet the quality standard requirement, method of eliminating the fault is according to the damage degree using grinding or turning after grinding method to repair or reinstall the sealing face of the new regulator. Three is another cause of the valve leakage is due to improper assembly or related parts size is not appropriate. core seat in the assembly process is not fully on or in combination with surface phenomenon of pervious to light, or the valve core seat sealing surface is too wide for seal. Elimination method is to check the size of the fit clearance around the valve core and the uniformity, the valve core hole top with sealing surface is degrees, check each clearance is not allowed to lift the valve core, appropriate reduce the width of the sealing surface according to your drawings to realize effective seal. Fourth, deformation of valve core, valve seat leakage. The main reason for the leakage of valve core and valve seat is due to the regulator the casting or forging defects in the process of production can lead to the strengthening of corrosion. Fluid scouring and corrosion medium through, also can cause valve leakage. Mainly exists in the form of erosion and cavitation corrosion, when the corrosive medium by the regulator, will produce to the valve core, valve seat material impact erosion and the valve core, the seat into oval or other shape, with the passage of time, lead to valve core, the seat is not form a complete set, there are gaps, lax leak. Good solutions to key the valve core and valve seat material selection, quality. Corrosion resistant materials, such as pitting, trachoma resolutely eliminate defects of products. If the valve core and valve seat deformation is not very serious, but after a sandpaper grinding, eliminate trace, improve the sealing surface, in order to improve the sealing performance. If was badly damaged and should be replaced to the new valve.
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