Patent ID: 7793729
Filing Date: 2010-09-14
Classification: E21B

Abstract:
1. A safety valve, comprising: a body having a flow passage extending therethrough that is intersected by a chamber; a seat ring surrounding the flow passage at an upper side of the chamber, the seat ring having a face located in a plane perpendicular to a flow passage axis of the flow passage; the chamber having a lower side with a rearward portion and a forward portion, the flow passage extending through the forward portion of the lower side of the chamber, the rearward portion being farther from an upper side of the chamber than the forward portion, the rearward portion being parallel to the forward portion and perpendicular to the flow passage axis; an inclined guide surface located between and joining the rearward portion of the lower side of the chamber with the forward portion of the lower side of the chamber; and a single-slab gate having an aperture therethrough and a ramp surface a lower side of the gate, the gate being movable in forward and rearward directions in the chamber between an open position wherein the aperture aligns with the flow passage and a closed position wherein the ramp surface slides on the guide surface and pushes the gate into sealing engagement with the face of the seat ring to block the flow passage.