Patent ID: 9243717
Filing Date: 2016-01-26
CPC Classification: E21B,F16K

Claim Text:
1. A gate valve for returned drilling mud pressure control and/or well killing, the gate valve comprising: a flow passage; a gate member movable for intersecting the flow passage; two fully skirted seats; and a valve bonnet arranged to accommodate said two fully skirted seats and said gate member such that the gate member is contained within the valve bonnet regardless of the position of the gate member, wherein the gate member includes a gate port which extends from one face to an opposite face of the gate member and is alignable with the flow passage for allowing material in the flow passage to pass through the gate member, and wherein a groove or recess is provided in an inner wall of the gate port, the groove or recess extending from the one face to the opposite face of the gate member, wherein the gate valve includes a regulating position in which a main circular section of the gate port is outside the flow passage, and the groove or recess is aligned with the passage to allow material to pass the gate member, and wherein the two fully skirted seats are configured such that the gate member is always in contact with and supported by the two fully skirted seats at both sides of the flow passage regardless of the position of the gate member.