Double positive isolation ball valve

A valve assembly, comprising:

• a valve body comprising a cavity having angled surfaces;
• a substantially spherical ball body disposed within the valve body, wherein the substantially spherical ball body comprises a bore having a first central axis offset from a second central axis of the substantially spherical ball body;
• an actuator configured to drive the ball body in a first axial direction along a third central axis of the cavity, to move the ball body in a second axial direction along the third central axis to unseat the ball body, and to rotate the ball body about the third central axis, wherein the actuator is configured to drive the ball body in the first axial direction and to move the ball body in the second axial direction without rotating the ball body about the third central axis;
• and
• one or more seats disposed between the ball body and the valve body, wherein the one or more seats are configured to move along the angled surfaces as the actuator drives the ball body in the axial direction, wherein a seat of the one or more seats comprises a first groove configured to receive a first protrusion extending from the angled surfaces of the valve body and a second groove configured to receive a second protrusion extending from the angled surfaces of the valve body, wherein the first groove and the second groove are positioned on opposite sides of the seat of the one or more seats, and wherein the first groove and the first protrusion and the second groove and the second protrusion are configured to block rotation of the seat with respect to the angled surfaces of the valve body.

A valve assembly, comprising:

• a valve body comprising a cavity;
• one or more seats disposed within the cavity, wherein the one or more seats comprise one or more seating surfaces;
• a ball body disposed within the valve body, wherein the ball body comprises a bore having a first central axis offset from a second central axis of the ball body by a distance, wherein the bore extends linearly through an entirety of the ball body, wherein the distance is based on a radius of the ball body and an angle of the one or more seating surfaces with respect to a third central axis of rotation and axial movement of the ball body in the cavity, wherein the distance is defined by an equation Rsin(α), wherein “R” represents the radius of the ball body, and wherein “α” represents the angle of the one or more seating surfaces with respect to the third central axis;
• and
• an actuator configured to move the ball body in a first axial direction along the third central axis to wedge the ball body against the one or more seats to form a seal, to move the ball body in a second axial direction along the third central axis to unseat the ball body from the one or more seats, and to rotate the ball body about the third central axis when the ball body is unseated from the one or more seats, wherein the actuator is configured to move the ball body in the first axial direction and to move the ball body in the second axial direction without rotating the ball body about the third central axis, and wherein the actuator is coupled to the ball body via a valve stem.