Patent ID: 8662183

Claim:
Apparatus comprising a valve casing assembly having a first port and a second port in axial alignment along a longitudinal axis extending between the ports, a tubing cutter rotatably trunnion-mounted in the valve casing assembly, said tubing cutter having an axis of rotation which is transverse to the longitudinal axis of the valve casing assembly, said tubing cutter being rotatable from a first position to a second position, wherein the tubing cutter has a transverse passage therethrough which aligns with the first and second ports of the valve casing assembly when the tubing cutter is in the first position and an exterior surface which seals against a portion of the valve casing assembly when the tubing cutter is in the second position and isolates the first port of the valve casing assembly from the second port, a hydraulic piston positioned in a cylinder fixed with respect to the casing assembly said piston being movable linearly from a first position to a second position, and a linkage assembly connecting the hydraulic piston to the tubing cutter for converting linear movement of the piston to rotational movement of the tubing cutter so that the linear movement of the hydraulic piston from the first position to the second position causes rotational movement of the tubing cutter from the first position to the second position, wherein the linkage assembly comprises an actuator connected to the hydraulic piston, said actuator having a first end and a second end and positioned in the second valve casing for longitudinal movement between a first position and a second position, said actuator comprising an annular wall at the first end and a pair of diametrically opposed arms depending normally from the annular wall in a direction away from the piston, and a linkage between each of the diametrically opposed arms of the actuator and the hollow tubing cutter body to convert axial movement of the actuator into rotational movement of the hollow tubing cutter body.