test and refine of globe valve
To solve such problems of structure and materials of the seal on the Globe Valve to test and refine, there are two ways.
1, the valve stem sealing parts to move to the valve (in the process of force on the sealing surface on the valve relative valve cover sealing surface is stationary no-slip condition). This improvement can increase seal life, but due to increase a valve cover and valve seal structure is more complex, lower cost.
2, change on the sealing materials. Too stand carbide surfacing in the stem seal on the cone anti-abrasion performance good Secretary, this method has achieved good results, but on the one hand because the stellite alloy cost is too high, on the other hand due to stem The basic material for the 13Cr martensitic stainless steel, weldability, surfacing to be preheated before, after welding, insulation and complex welding process. In addition, in order to ensure the dimensional accuracy of the stem, but also increase the roughing process. Comprehensive analysis, in addition to special requirements, this program its price is not good.
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