Knowledge about the installation method of flanged valves:
1. The flange surface of the valve and piping should be free from damage, scratches, etc. and kept clean. Especially when using metal washers, the groove of the flange should be matched with the gasket, and red Dan should be applied to ensure the sealing condition is good.
2. The verticality of the flange surface on the piping and the centerline of the piping and the error of the flange bolt hole should be within the allowable range. After the valve and piping centerline are consistent, install them.
3. When connecting the two flanges, firstly, the flange sealing surface and the gasket should be evenly pressed, thereby ensuring that the flanges are connected by the same bolt stress.
4. When tightening the bolts, use a wrench that matches the nut. When using hydraulic pressure and pneumatic tools, be careful not to exceed the specified torque.
5. Flange fastening should avoid uneven force, and should be tightened in the order of symmetry and cross.
6. After the flange is installed, make sure that all bolts and nuts are tightly tightened.
7. The material of bolts and nuts must meet the requirements. After tightening, the bolt head should be exposed from the nut with two pitches.
8. Fasten the bolts and nuts. To prevent looseness caused by vibration, use a washer. In order to avoid the adhesion between the threads at high temperatures, the threaded parts should be coated with a release agent.
9. For high temperature valves above 300 °C, the flange connection bolts, bonnet fastening bolts, pressure seals and packing gland bolts must be tightened again after the temperature rises.
10. When the valve is used at low temperature, it is at atmospheric temperature during installation. Due to the temperature difference, flanges, gaskets, bolts, nuts, etc. shrink, and because the materials of these parts are different, the coefficient of linear expansion is also Different, it forms an environmental condition that is very easy to leak. From this objective situation, when tightening the bolt at atmospheric temperature, it is necessary to adopt a torque that takes into account the shrinkage factor of each component at low temperatures.
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Label: What is the flange connection valve installation method?
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