The new field of mechanical seal performance research-

The new field of mechanical seal performance research

　2016-12-12　　

For more than 30 years since 1974, the most fruitful research in the field of static sealing of mechanical seals is the in-depth study of gasket performance.

Internationally, this achievement mainly comes from research institutions such as A PVRC, CETIM (French Machinery Industry Technology Center), BHRG, CFJN, etc.; after extensive research on the room temperature performance of the film, now t point has been transferred to them The high temperature performance. Under high temperature or thermal cycle, coupled with the action of oxidizing media or chemical or petrochemical fluids, the gaskets and bolts will undergo bat change and/or relaxation, and the material of the tortoise will change (construction or thermal decomposition), etc., which affect the sealing performance of the connection. The impact is much more pronounced than at room temperature. Leaks that are not visible in the short term at high temperature tend to leak after a period of time. This involves the effects of temperature, stress, and time.

In 1982, PVRC began to study the high-temperature performance of gaskets. At that time, it received responses from 14 groups in four countries. Its expected goals were: ①Exploring the sealing mechanism of bolted connections at a temperature away; ②Determining the cause of high temperature The various factors of leakage and the relationship between them; ③Propose a design method that can reduce the high temperature leakage of the flange. In 1985, out of the need to replace asbestos, MTI (American Institute of Chemical Industry Technology) and PVRC jointly carried out research on the high temperature performance of asbestos gasket materials to determine an evaluation of the long-term mechanical properties and sealing performance of non-asbestos gasket materials. Various tests have been carried out so far: ①simulated combustion screening test; ②high-temperature aging tensile/screening test; ③hot sealing test; ④age relaxation leak test; ⑤simulated combustion sealing test. These methods are being provided to manufacturers and users for screening and evaluating high-temperature gaskets PVRC0. The scope of the research topics on bolted flange connections is quite extensive.　　195.html,

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