Pay attention to what the problem is to replace the abrasive grinding thread fittings in before and

　　Pay attention to what the problem is to replace the abrasive grinding thread fittings in before and after each?

　　The screw thread pipe fittings lapping and at each replacement after the abrasive, must use gasoline or kerosene scrub grinding and mill is sealing surface. Wipe, the sealing surface evenly coated with a thin layer of oil mixed with the abrasive, and then wipe the abrasive on the sealing surface and alternately for 90. Turn 6~7 times, then the original position of abrasive 120~18 conversion, and then continue to grind. Repeat this operation 5~8 times, finally use gasoline or kerosene wash waste abrasive, coated with abrasive grinding continued, until qualified.

　　Thread fittings should make fine grinding, scratch have become a concentric circle, which can prevent the leakage of medium. Coarse grinding, grinding pressure on the sealing surface pressure should not be greater than 0.15MPa; fine grinding, should not be greater than 0 05MPa.

　　The best use of abrasive thread pipe lubricant oil, also can use yellow dry oil, kerosene, stearic acid, oleic acid and paraffin wax etc

　　The best use of abrasive thread pipe lubricant oil, also can use yellow dry oil, kerosene, stearic acid, oleic acid and paraffin wax etc

　　The grinding force should be uniform, and keep the edge of the sealing surface of the blunt or spherical grinding. Two adjacent sealing surface such as uneven, not Diego together with grinding grinding, respectively.