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:
Mar. 08, 1994
Filed:
Jun. 10, 1993
David D Comeaux, Sugar Land, TX (US);
ABB Vetco Gray Inc., Houston, TX (US);
Abstract
A gate valve has a relief passage to prevent excessive pressure buildup in the cavity of the body in the event of a fire. The gate valve has an upstream passage side and a downstream passage side that intersect the cavity. Seat rings are located at the intersection of the upstream and downstream passage sides with the cavity. A split gate moves between open and closed positions with the seat rings. A relief passage extends from the cavity to the upstream passage side. A frangible device locates in the relief passage to block flow during normal operation. If the pressure differential between the cavity and the upstream side exceeds a selected minimum, the frangible member breaks, allowing flow through the relief passage. This relieves pressure in the cavity.