| 摘要 |
An apparatus and method for retracting and inserting a shaft through a high pressure vessel while in operation comprising: a sleeve extending through a wall of the vessel, a shaft extending through the sleeve; a shield, compression seals, and valve to prevent materials within the vessel from escaping through the sleeve upon retraction of the shaft, and a prime mover connected to an end of the shaft outside the vessel wall for retracting and inserting the shaft.
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