1. The valve leakage under the pressure equipment to work normally, disc and seat sealing surface occurred more than allow degree of leakage, pressure release valve ( The relief valve) 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. A third of the relief 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 does not allow to lift valve core. Appropriately reduce the width of the sealing surface according to your drawings to realize effective seal. 2. Body combining surface leakage between the upper body and face the leakage phenomenon, the main causes of the leakage has the following several aspects: one is: enough or partial, in combination with the bolt force caused by combining face seal is not good. 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. 3. Impulse safety Industrial Valves 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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