Flange connection valve installed in 10 steps
Valves and pipe flange faces should be no damage, scratches, etc., and keep them clean. Especially the use of the metal gasket when the slots of the flange and the gasket should coincide with RESEARCH to be coated with a red lead, in order to ensure good sealing state.
2 vertical degree and the error of the flange bolt holes in the flange surface on the pipe and the pipe centerline should be within the range of permitted values. Valves and piping centerline to obtain consistent during installation.
3. Connecting the two flanges, first get the flange sealing surfaces and gasket evenly pressed, thus ensuring that rely on the same bolt stress of the flange connection.
Fastening bolts to use match with the nut wrench When fastening the use of hydraulic, pneumatic tools, pay attention not to exceed the specified torque.
Flange fastening to avoid uneven force, in accordance with the order of the symmetry, the direction of the cross - tighten.
Flange mounting, to confirm uniform tightening all the bolts and nuts.
Bolt, nut material must meet the requirements. After tightening the bolt head nut should reveal two pitch appropriate.
8 the fastening of the bolts and nuts, in order to prevent vibration caused by loosening, to be used washers. Order to avoid adhesions between the high temperature thread, install threaded parts should be painted abherent.
9 for more than 300 ℃ high temperature valves, temperature rise of the flange connecting bolts, valve cover fastening bolts, tighten the pressure seal and packing gland bolts again. This article comes from weaving dreams
10 Low valves used in the installation is in a state of atmospheric temperature, shrinkage occurs due to the formation of the temperature difference, flange, gaskets, bolts and nuts, etc., and because the material of these parts is not identical, each of the linear expansion coefficient different, the formation of the environmental conditions is very likely to leak.
Departure from this objective factors when considering the low temperature parts contraction torque when tightening the bolts in the atmospheric temperature.
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