Pressure relief valve for roller bit

Details Pressure relief valve for roller bit Pressure relief valve for roller bit

1987-10-05

1989-09-12

Dang, Hoang C.

Boring or penetrating the earth

With storage means for bit lubricant carried by bit or shaft

13754321, 175228, 251363, 251364, 251900, 384 93, E21B 1022

Patent

active

048651362

ABSTRACT:
A one-way pressure relief valve assembly is provided for venting the lubricant reservoir of a roller-type well drilling bit. The valve assembly is mounted in the cap of the lubricant reservoir, to open outwardly, and is adapted to provide hydrostatic loading of the valve element to its closed position.

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patent: 4276946 (1981-07-01), Millsapps, Jr.
patent: 4577705 (1986-03-01), Cross
patent: 4593775 (1986-06-01), Chaney et al.

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