The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 1981
Filed:
Aug. 13, 1979
Neil H Akkerman, New Orleans, LA (US);
Stephen R Foster, New Orleans, LA (US);
Kip B Goans, New Orleans, LA (US);
Baker CAC, Inc., Belle Chasse, LA (US);
Abstract
A control fluid valve assembly is provided which is respondable to a pressure monitored fluid. The assembly preferably comprises first and second valve seats within a housing. A spool element is shuttleable within the housing near the valve seat by either manual or mechanical manipulation to first and second positions and is responsive to pressure variation within the monitored fluid to shuttle it to a second position. Balls are contained in first and second valve head groups and are carryable by the spool element, the balls being selectively sealingly engagable onto and wipable off of the valve seat means to control fluid flow of the control fluid within the assembly in response to the pressure monitored fluid. A plurality of seals are defined between the housing and the spool means to prevent fluid communication therebetween and to define flow passageways across the spool. The spool is shiftable to each of first and second positions and when in one of the positions pressure is substantially equalized within the flow passageways and the spool is statically stabilized. When the spool is shiftable to the other position, pressure differential defined across one of the seals urges and holds the spool in this second position. A control shaft is provided which is selectively communicable to the spool for shuttling the spool in one direction to one position. Piston means are provided which are responsive to predetermined increase and/or decrease in pressure of the monitored fluid for shifting the shaft to shuttle the spool. The apparatus may be selectively calibrated to respond to at least one of high and low pressure tolerance to cause shuttling of the spool to manipulate the balls with respect to the seats to vary the flow passageways within the valve and to selectively open and close, for example, a subsurface safety valve within a subterranean oil or gas well.