Hydraulic circuit for borehole telemetry apparatus
US4266606A · kind A · utility
30Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 27, 1979 |
| Grant date | May 12, 1981 |
| Priority date | — |
| Expiry date | Aug 27, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86405
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A hydraulic circuit for borehole telemetry apparatus is presented wherein a mud pulse valve is operated by hydraulic pressure applied to differential areas of an actuating piston. The system includes a hydraulic pump, a filter in the line between the pump and the piston to be actuated, an accumulator upstream of the filter, a regulating and relief valve downstream of the filter, and solenoid actuated valves to control delivery of hydraulic fluid to the piston. The system also includes a pressure compensating bellows to compensate for changes in pressure in the drilling mud.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.