Higher standards of mechanical seal technology-

Higher standards of mechanical seal technology

　2016-12-07　　

With the higher standards of mechanical seal technology, since the new century, society and the public have further increased the requirements for mechanical seals. For example, at the end of the 1970s, the United States' indicator leakage rate for general industries was 10_3mg/〃mm. The tentative flange connection sealing criteria recommended by PVRC determines that 2xl(r3mg/S*min is the standard level. In the late 1970s, the domestic petrochemical and chemical companies have an annual leakage requirement for static sealing of equipment and pipelines. The leakage point is less than 0.5. And there is no obvious leakage, which is far behind foreign requirements for leakage rate. In the 1980s, while large-scale industrial production of liquids, the environmental quality requirements are also getting higher and higher, 75% come from valves, pumps and The volume and weight of flange volatiles in a year cannot be ignored. Therefore, some industrially developed countries put the control of volatiles on the agenda. The US Environmental Protection Agency (EPA> issued in 1990) 'Clean Air Am' (Clean Air Am), in which: ① 200 kinds of chemicals are listed as control objects; ② The mechanical seals of pumps, valves and flanges have formulated restrictions on the escape of volatile substances. For pumps, The valve also stipulates to be implemented in three stages. 　　189.html,

Design requirements for fluid mechanical seals 　　 Mechanical seal static sealing technology