A fluid control device, comprising: a valve body having an inlet port and an outlet port; a valve seat disposed within the valve body defining an opening fluidly communicating between the inlet port and the outlet port; a valve plug having an external surface and being movable along an axis between a closed position, in which the valve plug engages the valve seat and forms a primary seal, and an open position, in which the valve plug is displaced from the valve seat; a valve cage disposed within the valve body and having an internal surface sized to receive the valve plug, a gap between the valve cage and the valve plug defines a leak path; and a sealing ring, wherein at least a portion of the sealing ring is disposed within the gap to provide a secondary seal sealing the leak path when the valve plug is in the closed position, the sealing ring comprising a body having a generally L-shaped cross-section, the body comprising a flange portion and a resilient sealing band portion; wherein the flange portion is disposed transverse to the axis and is secured to one of the valve cage and the valve plug; and the resilient sealing band portion extends generally orthogonal to the flange portion and comprises a generally V-shaped cross-sectional portion comprising a pair of opposing leg portions (80a, 80b) meeting at a peak, each leg portion (80a, 80b) comprising a base (86a, 86b) disposed opposite the peak, the peak adapted to sealingly engaging one of the valve cage and the valve plug and the bases adapted to sealingly engage the other of the valve cage and the valve plug to provide the secondary seal when the valve plug is in the closed position. a valve body having an inlet port and an outlet port; a valve seat disposed within the valve body defining an opening fluidly communicating between the inlet port and the outlet port; a valve plug having an external surface and being movable along an axis between a closed position, in which the valve plug engages the valve seat and forms a primary seal, and an open position, in which the valve plug is displaced from the valve seat; a valve cage disposed within the valve body and having an internal surface sized to receive the valve plug, a gap between the valve cage and the valve plug defines a leak path; and a sealing ring, wherein at least a portion of the sealing ring is disposed within the gap to provide a secondary seal sealing the leak path when the valve plug is in the closed position, the sealing ring comprising a body having a generally L-shaped cross-section, the body comprising a flange portion and a resilient sealing band portion; wherein the flange portion is disposed transverse to the axis and is secured to one of the valve cage and the valve plug; and the resilient sealing band portion extends generally orthogonal to the flange portion and comprises a generally V-shaped cross-sectional portion comprising a pair of opposing leg portions (80a, 80b) meeting at a peak, each leg portion (80a, 80b) comprising a base (86a, 86b) disposed opposite the peak, the peak adapted to sealingly engaging one of the valve cage and the valve plug and the bases adapted to sealingly engage the other of the valve cage and the valve plug to provide the secondary seal when the valve plug is in the closed position.