Patent ID: 7926784
Filing Date: 2011-04-19
Classification: F16K

Abstract:
1. 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 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, wherein a gap between the valve cage and the valve plug defines a leak path; and a sealing ring having a generally L-shaped cross-section, at least a portion of the sealing ring 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 flange portion and a resilient sealing band portion, the flange portion secured to one of the valve cage and the valve plug, the resilient sealing band portion sealingly engaging the internal surface of the valve cage and an external surface of the valve plug to provide the secondary seal when the valve plug is in the closed position, wherein the sealing band portion comprises a generally v-shaped cross-sectional portion comprising a pair of opposing legs meeting at a peak, each leg comprising a base disposed on opposite sides of the peak, wherein the peak sealingly engages the external surface of the valve plug and each of the bases of the legs sealingly engage the internal surface of the valve cage.