Part of the relief valve disc and seat place of the seal in the event of leakage, beyond the rated so will lead to the loss of medium, and thus to damage the sealing material. — A case, the safety valve sealing surface is mainly composed of metal materials, and all fees to be smooth and flat, but in the medium with pressure under the condition of secondary extrusion, demanding to be completely sealed don't leak is unlikely. So, in the rated pressure environment, with steam as the medium of the relief valve can be simply to be inspected with the naked eye and ear. But the main reason for the valve leakage has the following two points: ( 1) Seal surface dirt and debris, etc. , and will be separated from the flat plug seal originally, cause a gap between valve core and valve seat. Lead to valve leakage phenomenon. To solve this kind of problem, usually 淸 seal dirt on the surface of the debris. And in boiler is temporarily disabled for maintenance, to run lead experiment was carried out for the security, once has the leakage phenomenon will overhaul. — A run lead spacing is 20 minutes after the cool completely. ( 2) The breakage of the sealing surface. Reason is more, such as: one is sealed with the unqualified material. After a safety valve in use for many years, is caused by reasons such as constantly switch in overhaul the strength of the sealing surface is weakened, leading to sealing ability is weakened. The Suggestions to solve the problem of the measures is to originally made on sealing surface, and secondary processing according to the original drawings of welding, enhance surface hardness and strength. And to pay attention to the damage on the surface, must not be careless. Second, the maintenance quality. Due to poor maintenance level, Industrial Valves core and valve seat on the grinding process can't reach a certain level. Solution is depending on the damage of yan to use means such as grinding or turning to as much as possible to repair the sealing surface. Three is the wrong size or improper assembly parts. In the whole assembly work, the valve core and valve seat not alignment, or in combination with surface of pervious to light appeared serious problem, it is possible that the valve core and valve seat seal is too loose, really hard seal. Solution is strict check valve core appears next to the length of the gap and the thickness distribution, and to ensure that the clearance will not lift valve core, the parts according to the data on the drawings to properly reduce the width of the sealing surface to seal. Keywords: valve leakage valve leak reason valve leakage treatment
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