Regarding the technical requirements of mechanical seals-

Regarding the technical requirements of mechanical seals

　2016-12-14　　

Due to economic and technical issues, with the exception of some military industry, nuclear industry, and aerospace departments, the requirements for sealing are still at a relatively low level. For example, the United States’ leak rate index for general T industry is 丨0• mm . PVRC recommends that 2 x 丨O•m丨丨 are the standard grade in the tentative flange connection sealing criteria. In the 1980s, with the large-scale development of industrial production, the requirements for environmental quality have become higher and higher, and the volatile substances from valves, pumps and flanges can no longer be ignored. Therefore, some industrially developed countries have put the control of the escape of volatile substances on the agenda.

In the 'Clean Air ActRestrictions on the escape of volatiles. The requirements for pumps and valves are implemented in a three-stage sealing improvement plan, and it is required that the effluent escape M be controlled within a few hundred ppm (丨ppm u003d l(Th>). Therefore, some foreign seal manufacturers have already achieved this. The products under these control regulations are the leading products in market competition, and the research department also turned its attention to this aspect. 　　197.html,

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