Metal spiral wound gasket functions should be how to choose
Metal spiral wound gasket is a sealing element is important, is widely used in petroleum, chemical, metallurgy, electric power, shipbuilding and other industries, is the currentChinese pressure piping, valves, pumps, heat exchangersand other equipment for static sealing parts. So the selection and use of high-quality metal winding gasket products, toreduce and eliminate run, take, drop, leakage, ensure the safety of pressure pipelines, mainframe equipment in normal operation, has the very vital significance. How to choose themetal winding gasket?
A, choose metal spiral wound gasket products should pay attention to the following points:
1, according to the selection of gasket sealing surfaceconditions, flange.
2, the sound quality management system and effective operation of the production enterprise products, the best selection of holders of special equipment (pressure piping components manufacturing license) and type test report of enterprise products.
3, the gasket body surface does not allow a scar, voids,rugged and rust defects affect the sealing performance. The gasket body surface non metal belt should be uniform,moderate to high metal band, interlayer texture should be clear, but not exposed metal belt. Metal spiral wound gasketspot spacing should be uniform, there should be no lack of fusion or welding defects. Reinforcing ring surface should not have burrs, rough, rust and other defects, the main body of the gasket sealing surface and the reinforcement ring on thesurface spacing should be equal to strengthen ring and gasket between the main body should be tightly fixed, notloose; with stiffening ring and gasket body should be alocation and can be suitable when loosening.
4, compression ratio, and the sealing performance is an important performance index, the gasket in general, thecompression ratio of the requirements of the premise, the rebound rate is higher; and in order to meet the standard requirements of the rebound rate, compression ratio of thetest value is bigger is better. Should choose good sealing performance, compression rate is modest and resilience rateis as large as possible products.
B, the installation of metal spiral wound gasket should pay attention to the following points:
1, before installation, carefully check the quality flange, bolts,nuts and gaskets, carefully check the flange or interfaceinstallation, defect is unbiased mouth, mouth, mouth, wrongwrong hole.
2, the flange or the sealing surfaces must be clean,mechanical adhesion of impurities does not allow gasket surface and bolt, screw thread.
3, the gasket can not be installed offset, should guarantee the uniform compression.
4, tighten the nut force should be uniform, bolts to besymmetric and evenly divided into 2 to 3 times that of uniform compression screw, gasket.