| 摘要 |
A seal assembly (22) for sealing a pressurized gaseous product includes, a pair of seals (24,26) spaced axially to provide a chamber (28) therebetween, a gas seal (24) being disposed on the inboard side of the seal assembly (22) between the sealed gaseous product and the chamber (28), an inlet (38) opening to the side of the gas seal (24) exposed to the gaseous product, the inlet (38) being connected to a supply of clean gas, the chamber (38) defined between the seals (24,26) being connected to a reservoir (50), the reservoir (50) being connected back to inlet (38) via a pressure intensifier (70) and the reservoir (50) being connected to the supply of clean gas, so that additional clean gas may be supplied thereto, when pressure in the reservoir (50) falls below a predetermined minimum value.
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