1 spool valve with a sharp edge to scratch, abrasion and corrosion, the shoulder angle is extruded and turned round, shall repair or replace chrome.
Chrome plated repair, should first remove about 0.2mm before plating, 0.4-0.5mm plating chromium, then according to the body size hole grinding to the required size. All sharp edges in addition to the requirements, are not allowed to.
2 spool valve shell cracks, should be replaced.
3 sliding wear of the valve hole, grinding repair.
Stick with the grinding of cast iron than the body soft, each at least two. Coarse grinding with grinding rod with oil groove; lapping with the grinding rod is a smooth cylinder. Simple structure, is easy to ensure the hole size, high precision grinding, roundness and cylindricity of not more than 0.005mm, the surface roughness can reach less than 0.1 µ M. But the efficiency is low, the grinding rod short service life.
Grinding rod requirements than hole length above 100mm.
Grinding with M10 alumina grinding paste, paste generally use 98% kerosene, 1%-2% oleic acid; also can be in rough lapping with kerosene mixed with a small amount of machine oil; lapping with petrol or gasoline mixed fuel.
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