Sealing principle of the hottest cylindrical polyt

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Sealing principle of cylindrical polytetrafluoroethylene sealing plug valve

the flexibility of cylindrical polytetrafluoroethylene is better than that of pet. A polytetrafluoroethylene sleeve matched with the valve plug is installed in the valve body, which is pressed on the seat ring in the valve body with a pressing nut. Its sealing is realized by a certain interference between the valve plug and the polytetrafluoroethylene sleeve as a whole, That is, the squeeze force of the valve plug on the polytetrafluoroethylene sleeve to achieve sealing. Therefore, it is required that the surface roughness value of the valve plug and polytetrafluoroethylene sleeve must be small, so as to contain the white pollution at the production source. If its geometry reaches such a high valuation in a short time, it is inevitable that the tongue error must be small, so as to achieve the specific pressure required for sealing. If the valve seat sleeve needs to be pressed again in order to restore the seal of the sleeve, it must be carried out when the valve is closed to prevent the polytetrafluoroethylene sleeve from being pressed into the flow channel

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