[Asia Pump Network News] High-pressure liquid ammonia pump outlet check valve repair program has two aspects, one leakage repair program, the other is the internal leakage repair program. The reason is mainly because it is in the overhaul, subject to the maintenance of the time limit, can not be offline repair, so to be repaired in the field. High-pressure liquid ammonia pump outlet check valve overhaul program 1 leakage repair program (1) with a small electric mill hand-polished valve body sealing surface cracks, while the surface coloring inspection, until the complete elimination of crack defects. (2) use A402 electrode (chrome 26 nickel 21 stainless steel electrode), with hot spot welding repair valve body sealing surface grinding Department. (3) Using a small electric mill manual grinding welding, so that the height of the valve body surface flush with the basic. (4) Production of inner ring grinding ring. (5) with the grinding ring made by hand to seal the surface grinding, grinding the inner diameter: 160.7mm. (6) according to the inner diameter of the mill served as a seal ring. 2. Internal leakage repair program (1) with a portable grinding machine seat sealing surface. Make sure it returns to a circle in the presence of cemented carbide. (2) Use four-card positioning on the lathe to find the center of the shaft center hole and reaming at the same time. (3) car system two rings (1Gr18Ni9Ti) set in the reaming. To ensure that the same in the center of the case, with a reasonable fit with the shaft, and spot welding fixed. (4) car through the shaft (1Gr13). (5) welded with tungsten carbide D547 molybdenum valve head, according to the valve seat after grinding repair valve head sealing surface. (6) After trial with Hongdan test to ensure its sealing. Extended reading: Top ten brands of motorcycles Canton Fair Central China Construction Water Exhibition Pump manufacturers ranked ptc exhibition industry Internet (Xiamen) Technology Co., Ltd. Asia Pump Network Editor: He Duanhui (QQ / WeChat:) http: //beng.liuti. cn / (Service Hotline:)
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