1. 阀门漏泄 在设备正常工作压力下，阀瓣与阀座密封面处发生超过允许程度的渗漏， 泄压阀( The relief Industrial Valves) The leakage not only causes loss of medium. In addition, the dielectric constant leakage will cause the hard sealing material damage, however, the commonly used pressure relief 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 the working medium is steam safety valve, under prescribed pressure value, if the outlet invisible to the naked eye, also don't recognize there is leakage, thought that the sealing performance is qualified. Generally the cause of the valve leakage mainly has the following three conditions: the first kind of circumstance is: dirt impurities on sealing surface, the sealing surface mat, causing a gap between valve core and valve seat, valve leakage. Method of eliminating the fault is cleared dropped a seal surface dirt and impurities, general big improvements in boiler for boiler stop, first do exit lead test run, if leakage is found after the furnace for overhauling. If it is a point after the furnace leakage found in testing the run lead the security, estimation is caused by this kind of situation, can be in running tuo cooling after 20 minutes after rudder, scour on sealing surface. The second is the sealing surface damage. The main reason for the sealing surface damage has the following points: one is the bad sealing surface material. Currently using YST103 general steel electrode welding processing of valve core sealing surface effect is good. Second, poor quality of maintenance, the valve core seat grinding can not meet the quality standard requirement, method of eliminating the fault according to the damage degree are grinding or turning the sealing surface grinding of repair methods.  造成安全阀漏泄的第三种是由于装配不当或有关零件尺寸不合适。 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 does not allow to lift valve core. Appropriately reduce the width of the sealing surface according to your drawings to realize effective seal. 2. 阀体结合面渗漏 指上下阀体间结合面处的渗漏现象，造成这种漏泄的主要原因有以下几个方面： 一是：结合面的螺栓紧力不够或紧偏，造成结合面密封不好。 Elimination method is to adjust the bolt tightening force, when the bolt must hold tight the diagonal manner, it is best to tight while measuring clearance, everywhere to bolt tight tight so far, and make the joint gap is consistent throughout. The second is: body combined with the tooth gasket is not in conformity with the standards. For example, tooth-type gasket radial slightly trench, parallelism is poor, defects such as tooth tip or a slope would cause the seal failure. So that the body joint leakage. Good during the maintenance spare parts quality, adopt standard tooth gasket can avoid the occurrence of this phenomenon. Three is: poor body joint surface flatness or be hard impurities pad seal failure. Due to poor body joint surface flatness body combined with the surface of the leakage, to eliminate the method is the disintegration of the valve to grinding surface until it meets quality standards. Caused by impurities mat live seal failure, when the valve assembly carefully avoid impurities into the clean surface. Impulse safety valve action after pressure relief valve ( The relief valve) No action is given priority to exit from this kind of phenomenon is often said.
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