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Seal valve life improvement of several commonly used methods
Globe valve structure is simple, the valve stem can both rotate and lift the principle of the valve to open or cut off, and to ensure that the valve seal and sealing function. Due to the special kinematic principle of the structure, it also brings about extremely unfavorable consequences on the force acting on the seal on the valve (forming the necessary vertical pressure between the seal pairs and the relative slip between the seal pairs). Practice has proved that the valve on the seal often only open and close a few times, as a result of the seal between the scratch caused by leakage. Slightly need to open the repair of abrasions, serious abrasions are scrapped due to damage, such consequences not only increase the cost of manufacturing enterprises, but also affect the performance of the valve. To solve such problems on the valve seal structure and materials have been tested and improved. â‘ the valve stem on the seal to move to the valve flap (purpose is to force the process, the valve flap on the sealing surface relative to the valve cover on the sealing surface in a static non-slip state). Although this improvement can improve the life of the seal, but due to the valve cover to increase the seal between the valve makes the structure more complex, lower cost. â‘¡ change the sealing material. In the stem seal cone surfacing scratch good Stellite hard alloy, although this method has achieved good results, but on the one hand due to Stellite alloy cost is too high, on the other hand stem The basic material for the 13Cr martensitic stainless steel, poor weldability, pre-welding to be welded when welding, welding insulation welding process complicated. In addition, to ensure the dimensional accuracy of the stem, but also increase the roughing process. Comprehensive analysis, in addition to special requirements, the program is not good value for money. Practice has proved that progressing stem cone hardness is a feasible way to improve the sealing life of the globe valve.