Ball valve with sealing element

A method, comprising:

• providing a ball valve that includes:
• a body that defines first and second valve ports circumferentially offset from each other on the body by a first angular distance;
• a valve member positioned within the body and rotatable about a central axis, the valve member defining an inlet port and first and second outlet ports extending perpendicularly from the central axis;
• a first sealing element mounted within a first annular groove defined on the valve member, and a second sealing element mounted within a second annular groove defined on the valve member, the first and second sealing elements being circumferentially offset from each other on the valve member by the first angular distance and circumferentially offset from the first and second outlet ports by a second angular distance;
• and
• a first seal system positioned within the first valve port and a second seal system positioned within the second valve port, the first and second seal systems each including a valve seat, a boost piston arranged within a cavity defined at least in part by the valve seat, and a bias spring engageable with the valve seat;
• engaging the valve seat of each seal system on the valve member with the valve member in a closed position, where the first and second outlet ports are misaligned with the first and second valve ports;
• generating a pressure differential across the ball valve and across each of the first and second seal systems;
• urging the valve seat of each seal system against the valve member with the boost piston of each seal system in response to the pressure differential;
• sealingly engaging the valve seat of the first seal system against the valve member and the first sealing element;
• and
• sealingly engaging the valve seat of the second seal system with the valve member and the second sealing element.