Patent ID: 9239114
Filing Date: 2016-01-19
CPC Classification: F16J

Claim Text:
1. A compressable sealing ring assembly for sealing an annulus of a packing box between a radially outer member having an inner wall and a radially inner member having an outer wall, the sealing ring assembly comprising: at least three annular compression ring members each having a concave lower surface and a convex upper surface, a radially outer wall for engagement with the inner wall and a radially inner wall for engagement with the outer wall; at least two annular sealing ring members each acted on by the concave lower surface of one of the compression ring members and acted on by the convex upper surface of another one of the compression ring members to deform the sealing ring members to maintain a seal, wherein prior to being acted on by the compression ring members, the sealing ring members each include upper and lower surfaces disposed substantially perpendicular to the radially inner and outer walls; a ring shaped packing follower having a substantially planar surface for exerting a force on a sealing ring member of the compressable sealing ring assembly, wherein the substantially planar surface is disposed substantially perpendicular to the radially inner and outer walls; and another sealing ring member acted on by the convex upper surface of one of the compression ring members and acted on by the substantially planar surface of the packing follower, wherein prior to being acted on by the one of the compression ring members and the packing follower, the another sealing ring member includes upper and lower surfaces disposed substantially perpendicular to the radially inner and outer walls, wherein an endmost one of the compression ring members has the concave lower surface thereof positioned for engagement with a planar surface of the packing box.