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[ Derwent Title ]

Country: US United States of America

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13 pages

Inventor: Crowe, Talmadge L.; Houston, TX

Assignee: Baker Oil Tools, Inc., Los Angeles, CA
other patents from BAKER INTERNATIONAL CORP. (51230) (approx. 379)
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Published / Filed: 1975-03-04 / 1973-06-15

Application Number: US1973000370354

IPC Code: Advanced: E21B 34/08; E21B 34/10; E21B 34/12; E21B 43/00; F16K 5/06; E21B 34/00;
Core: more...
IPC-7: E21B 43/12; F16K 11/20;

U.S. Class: Current: 166/324; 137/629;
Original: 166/224.A; 137/629;

Field of Search: 166/072,224,224 A 137/629

Priority Number:
1973-06-15  US1973000370354

Abstract: A subsurface safety valve for wells, including a ball valve closed by well fluid pressure and opened by control fluid pressure supplied from the surface. The ball valve includes a control fluid pressure responsive balancing valve for equalizing pressure across the closed ball valve to relieve the ball valve seating pressure. The ball valve is rotatable on support pins carried by the control fluid pressure responsive piston. A spring acts upwardly on the piston to assist well fluid pressure in overcoming control fluid pressure to close the ball valve.

Attorney, Agent or Firm: Kriegel, Bernard ;

Primary / Asst. Examiners: Leppink, James A.;

INPADOC Legal Status: None          Buy Now: Family Legal Status Report

Family: Show 21 known family members

First Claim:
Show all 23 claims
I claim:     1. In a subsurface shutoff valve for wells adapted to be supported in a well fluid production pipe: a body having a flow passage therethrough; shutoff valve means including a member shiftable between a first position closing said passage and a second position at which said passage is open; actuator means for shifting said member between said positions, including means defining a control fluid pressure chamber for moving said member to said second position and means responsive to the pressure of well fluid in the production pipe for biasing said member to said first position upon reduction in the pressure of control fluid in said chamber; said member including by-pass valve means for equalizing the well fluid across said shutoff valve means before said member is moved from said first position to said second position.

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Forward References: Show 14 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (14)   |   Backward references (5)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 10pp US3310114* 1967-03 Dollison    
Get PDF - 11pp US3543793  1970-12 Dollison   WELL TOOLS
Get PDF - 12pp US3703193  1972-11 Raulins  Otis Engineering Corporation VALVES
Get PDF - 10pp US3741249  1973-06 Leutuyler  Baker Oil Tools, Inc. BALL VALVE WITH RESILIENT SEAL
Buy PDF USR25471* 1963-11 Fredd    
  * some details unavailable
Foreign References: None

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