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:
Apr. 30, 1991
Filed:
Feb. 23, 1990
Charles C Partridge, Houston, TX (US);
Tom Wheatley Valve Co., Houston, TX (US);
Abstract
A subsea barrier valve 20 with a valve clapper 60 adapted for free swinging movement on a clapper shaft 62 between a position which closes the flow passage through the valve and a position proximate the fully open position such that the clapper is held open by a pressurized flow of gas through the valve. In the event of an upstream pipeline failure, the clapper closes in a 'fail-safe' manner. The clapper can be pivoted and locked in the full open position by axial rotation of a locking shaft 105 which extends through a cover member 30 for an access opening in the valve body 21. The locking shaft 105 extends perpendicular to the clapper shaft 62 and is interconnected therewith by a gear drive 106 including a clutch gear 126 which allows a limited range of free pivotal movement of the clapper 60. The locking shaft 105 is controlled by actuator means 140,141 mounted on the cover member 30 by a separable fastener 142. The cover member 30 is clamped by a releasable clamp means 35. Projecting mandrels 260 on a clamping ring component 85 of the releasable clamp means 35 can be seized by a grappling tool for release or installation of the clamp means. A similar mandrel 149 on the cover member 30 allows for retrieval of the valve 20 or its intervals when the cover member 30 is released. Mandrels 208 provided on a support plate 144 for the actuator means 140,141 permit the retrieval or replacement of the actuator means.