旋塞阀材料要求里的一句话? for abrasive services with high sand content or high velocities or both, the materials in claused 3.5, 3.6, 3.7, and 3.8 shall be modified so that plug taper seat & body taper seat shall have an overlay of stellite having finished thickness of 1.7 mm minimum. the stellite deposit will overlap at least 26mm from the edge of the plug & body port into the plug port / body passage. 这个有涉及焊接?从这段文字看,这个好像和保护层有关。 如果经过阀门介质由于含沙量高或流速高或因两种因素而具有磨损性,则须更换第3.5节、3.6节、3.7节和3.8节中规定的材料,这样阀塞和阀体表面 堆焊一层(保护层?) 最终厚度至少为1.7mm的斯泰利合金。从阀塞和阀体接口至阀塞接口/阀体接口区域的斯泰利合金涂层厚度为26mm。查看更多