Patent ID: 7451959

Claim:
A fluid control valve comprising: a body having a flow passage therethrough and a transverse opening therein; a rotatable plug valve member mounted in the transverse opening for rotation about an axis, the rotatable plug valve member having a port therethrough and being capable of movement between a closed position in which the rotatable plug valve member prevents fluid flow through the flow passage and an opened position in which the port aligns with the flow passage; a recess in the body located at an intersection of the flow passage and the rotatable plug valve member; a segment located within the recess, the segments having an inner wall surface in sealing contact with the rotatable plug valve member and an outer wall surface, the segment having a hole whose axis aligns with the flow passage; a channel located on the outer wall surface of the segment, the channel having two sides and a bottom; an elastomeric seal located within the channel, the elastomeric seal in sealing engagement with a base of the recess; and a rigid boss protruding towards the base of the recess from the outer wall surface of the segment adjacent to one side of the channel and adjacent to the hole for contact with the base of the recess adjacent to the point where the elastomeric seal contacts the base of the recess.