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Installation knowledge summary of flange connection valve
1. The flange of the valve and piping should be free of damage, scratches, etc., and keep clean. Especially when using metal washers, the flange of the groove should be consistent with the gasket, to be coated with red to carry out with the research to ensure that its sealed in good condition.2. The flange on the pipe and the piping centerline of the vertical and flange bolt hole error should be within the allowable range. Valve and piping centerline to be consistent after the installation.
3. When connecting two flanges, first make the flange sealing surface and gasket evenly pressed, thus ensuring the same bolt stress on the flange connection.
4. When fastening the bolts, use a wrench that matches the nut. When tightening with hydraulic and pneumatic tools, be careful not to exceed the specified torque.
5. Flange fastening to avoid force uneven, should be in accordance with the symmetry, the direction of the order of tightening.
6. After the flange is installed, make sure that all bolts are tightened evenly.
7. Bolt, nut material must meet the requirements. After fastening, the bolt head should be exposed from the nut two pitch is appropriate.
8. Fastening of bolts and nuts, in order to prevent loosening caused by vibration, use gaskets. In order to avoid the adhesion between the high temperature thread, the installation of threaded parts should be coated with anti-adhesive.
9. For high temperature valves above 300 ℃, after the temperature rises, the flange connection bolts, bonnet fastening bolts, pressure seals and packing gland bolts must be tightened again.
10. When the valve is installed at low temperature, the temperature difference, the flange, the gasket, the bolts, and the nut are contracted, and because the materials of these parts are different, the respective linear expansion coefficient Different, formed a very easy to leak the environmental conditions. From this objective situation, when tightening the bolts at atmospheric temperature, it is necessary to use moments that take into account the shrinkage factors of the components at low temperatures.
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