E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/73
E21B 10/22 (2006.01) E21B 10/24 (2006.01) F16C 33/66 (2006.01) F16N 17/00 (2006.01)
Patent
CA 1159443
ABSTRACT OF THE DISCLOSURE An automatic depth compensating system is provided for controlling the pressure in a volume such as the interior of a rotary drill bit in response to pressure changes in the environ- ment adjacent to the volume. The system comprises at least one pressure compensating device positioned between the volume and the environment for changing the pressure in the volume in response to pressure changes in the environment. The system further includes a pressure surge compensating device which is positioned between the volume and the environment for compensating for positive and negative pressure surges when the pressure in the volume changes relative to the pressure in the environment. The pressure com- pensating devices each comprises differential piston devices having a spring for biasing the differential piston and the pressure surge compensating device comprises a cylinder, a piston positioned in the cylinder and forming a chamber therein and first and second check valves for opening in response to predetermined pressure differentials between the environment and the interior of the volume.
378337
Barnetche-Gonzalez Eduardo
Borden Ladner Gervais Llp
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