Systems and methods for double piston effect ball valves

A method of assembling a ball valve system, the method comprising:

• securing a ball within a body, the body including an upstream end and a downstream end;
• inserting a stem within the ball, the stem including an actuator portion;
• rotating the ball, via the actuator portion of the stem, between an open position and a closed position;
• securing a seat assembly with a first end facing towards the ball and a second end facing away from the ball, the seat assembly including:
• a seat, the seat being in contact with the ball;
• a lantern ring, the lantern ring positioned closer to the second end of the seat assembly than the first end of the seat assembly;
• and
• a seal, the seal positioned between the seat and the lantern ring.

A ball valve system, comprising:

• a body having an upstream end and a downstream end;
• a ball within the body between the upstream end and the downstream end, the ball being rotatable about a vertical axis to move between an open position and a closed position;
• a stem with a body and an actuator portion, wherein the body of the stem is positioned substantially parallel to the vertical axis, and wherein the stem is coupled to the ball such that the actuator portion of the stem is configured to rotate the ball between the open position and the closed position;
• and
• a seat assembly with a first end facing towards the ball and a second end facing away from the ball, the seat assembly including:
• a seat, the seat being in contact with the ball;
• a lantern ring, the lantern ring positioned closer to the second end of the seat assembly than the first end of the seat assembly;
• and
• a seal, the seal positioned between the seat and the lantern ring,
• wherein the seat, lantern ring, and seal are positioned in such a way that the seat assembly creates a double piston effect, and
• wherein the lantern ring limits movement of the seal such that the seal is prevented from movement to the second end of the seat assembly.