Flow control valve for rock bits

Details Flow control valve for rock bits Flow control valve for rock bits

1978-04-28

1979-05-15

Leppink, James A.

Boring or penetrating the earth

With means movable relative to tool or shaft to control...

Valve prevents upward flow

175337, E21B 908

Patent

active

041543130

ABSTRACT:
A rotary rock bit with passageways for conducting air or other gaseous fluid to cool the bearings and flush cuttings from the borehole includes valve means for controlling the entry of water into the bearings. The stream of air or other gaseous fluid is directed through a valve system that prevents water from reaching the bearings. In one embodiment a truly positive backflow shutoff valving arrangement through both the nozzle and bearing passageways provides a means for more effectively preventing water and cuttings from entering the bearings and bearing passageways of the bit.

REFERENCES:
patent: 3125174 (1964-03-01), Medlock et al.
patent: 3268018 (1966-08-01), Neilson
patent: 3401758 (1968-09-01), Talbert
patent: 3534823 (1970-10-01), Frederick
patent: 4092054 (1978-05-01), Dye

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