| 摘要 |
The disclosure is related to a high temperature, zero leakage packing assembly for use in connection with the valve stem of a high pressure control valve. The packing assembly is particularly suitable for use in the control of high temperature, high pressure fluids containing corrosive materials, such as molten salt. The packing assembly generally comprises a bushing arrangement forming the lowermost portion of the assembly and a plurality of series arranged, axially stacked sealing barriers mounted above the lowermost bushing element. In accordance with a specific feature of the invention, the lowermost bushing element comprises a heat and corrosion resistant material and is formed to include an internal fluid chamber arranged to provide a fluid reservoir around the valve stem. Pursuant to an additional embodiment of the invention, a cartridge element is arranged and configured to house and enclose the sealing barriers, whereby the cartridge element and enclosed sealing barriers comprise an integral unit.
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