Force balanced rotating pressure control device

A rotating pressure control device comprising:

• an outer housing;
• an inner housing with a sealing element, the inner housing adapted for rotation within the outer housing by an upper bearing and a lower bearing;
• wherein a constriction of the sealing element to a drill pipe is controlled by a pressure of a hydraulic fluid;
• wherein an upper piston area is created between an upper dynamic rotary seal and a middle dynamic rotary seal;
• wherein a lower piston area is created between an outside surface of the drill pipe and an outside diameter of a lower dynamic sealing element;
• wherein the pressure of the hydraulic fluid is adjusted to create a downward force in the upper piston area so that a total load transmitted from the inner housing through the upper bearing and the lower bearing to the outer housing is balanced;
• and
• wherein the middle dynamic rotary seal is located between the inner housing and the outer housing and below the sealing element.