Spirally wound gasket

Abstract

The invention provides a spirally wound gasket which comprises a supporting ring which is arranged in the inner circle, a positioning ring which is arranged in the outer circle and a sealing layer which is arranged between the supporting ring and the positioning ring. The sealing layer comprises a plurality of layers of sealing structures which are arranged between the supporting ring and the positioning ring in a stacked mode, a teflon sealing layer which is close to the inner circle and a graphite sealing layer which is close to the outer circle. Due to the fact that the teflon sealing layer has good acid-base resistance properties, when the teflon sealing layer is used in a pipeline of medicine liquid in chemical engineering, pharmacy and the like in a medium term or a long term, the delivery pipeline can be easily cleaned, the teflon sealing layer is arranged in the inner layer, and safety of the medicine liquid in the delivery pipeline is guaranteed. Meanwhile, due to the fact that the graphite sealing layer has a heat resisting advantage, the graphite sealing layer is arranged on the outer portion of the gasket to improve the heat resisting performance of the whole prepared spirally wound gasket, the acid-base resistance properties are guaranteed, and meanwhile the property that the inner portion of the delivery pipeline is easy to clean is guaranteed.

Description

technical field [0001] The invention relates to the technical field of sealing materials, in particular to a wound gasket. Background technique [0002] In the chemical and pharmaceutical industries, the liquid medicine in the production process is transported through pipe splicing, and the sealing function is guaranteed by winding gaskets between the spliced ​​pipes. [0003] The wound gasket is composed of a supporting ring on the inner ring, a positioning ring on the outer ring and an intermediate filling and sealing structure wound and filled between the two. The support ring and the positioning ring are usually made of metal materials, and the intermediate filling and sealing structure can use graphite or polytetrafluoroethylene according to different use environments. [0004] Graphite-filled wound gaskets can be used in environments with a maximum temperature of 550 degrees due to the high temperature resistance of graphite. However, graphite has low acid and alkali ...

AI Technical Summary

Problems solved by technology

[0004] Graphite-filled wound gaskets can be used in environments with a maximum temperature of 550 degrees due to the high temperature resistance of graphite. However, graphite has low acid and alkali resistance and is easy to dissolve during long-term use, causing pollution of the transported liquid, making production Dirty environment is not conducive to the transportation of liquid medicine

The wound gasket made of PTFE has strong acid and alkali resistance and good cleaning performance. However, the wound gasket made of PTFE has weak high temperature resistance and can only be used in environments within 280 degrees. Not suitable for chemical and pharmaceutical industry applications

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