| 摘要 |
A junk basket having a housing with cutting means on the lower end thereof and junk retaining means supported within the housing, a valve assembly mounted within the housing above the junk retaining means and including a tubular valve housing valve means for controlling flow through the valve housing, pressure responsive operating means for actuating the valve means whereby the valve means is moved between open and closed positions responsive to the stopping and starting of the flow of drilling fluids through the housing, means providing circulating of fluid through the valve housing and the basket housing when the valve means is closed, cam means for supporting the valve means in open position in one position of the cam means and releasing support from the valve means to allow it to close in a second position and stepping means for actuating the cam means between its first and second positions responsive to the starting and stopping of flow of drilling fluid through the housing.
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