Patent ID: 9309737
Filing Date: 2016-04-12
CPC Classification: E21B

Claim Text:
1. A valve assembly comprising: a valve body having an axial flow passage therethrough and a lateral bore transverse to the axial flow passage; and a gate, the gate comprising a cylinder rotated about a gate axis, the gate being located within the lateral bore and moveable in a longitudinal direction along the gate axis from an open position to a closed position, the gate moveable in the longitudinal direction along the gate axis by a linear force applied against the gate in the direction of the gate axis, the gate permitting flow through the axial flow passage in the open position and a solid portion of the outer diameter of the gate obstructing the axial flow passage in the closed position, and the gate rotating about the gate axis while moving axially from the open position to the closed position, wherein the valve body is shaped to engage the gate as it moves in the longitudinal direction along the gate axis and initiate rotation of the gate about the gate axis between the open and closed positions when a shear surface of the gate is a predetermined axial distance from the closed position, and wherein the shear surface of the gate is operable to exert simultaneous axial and rotational shear forces against a conduit disposed in the axial flow passage while moving between the open position and the closed position, such that a fully severed section of the conduit is swept into an orifice of the gate, thereby reducing damage to the shear surface of the gate by preventing severed material of the severed section from being caught between the shear surface of the gate and the valve body,