| 摘要 |
<p>A hydraulically operated tool capable of performing both boring and cutting operations on the coke bed of an oil refining coke drum comprises boring nozzles (12) for boring a pilot hole in a coke bed and cutting nozzles (20) for cutting up the coke for removal. The sequence of boring and cutting operations is controlled by a working fluid actuated shuttle sleeve or valve reciprocally mounted in the tool body, the sleeve being reciprocated by working fluid pressure moving from a first position corresponding to boring only to a second position corresponding to the cutting only. Changeover between boring and cutting operations occurs automatically using working fluid pressure without the need to remove the tool from the coke bed and may be accomplished by an operator at a remote location through the use of a pilot valve. Working fluid pressure is directed to one side of a differential area on the shuttle sleeve by a pilot valve. The pilot valve is activated by an operator at a remote location by controlling working fluid pressure communicated to the tool.</p> |
