초록

Composites of flexible graphite particles and an amorphous carbon phase useful for applications such as valve packing end rings.

대표청구항 ▼

A seal adapted to prevent fluid leakage through the clearance between a moving shaft and the edge of an aperture where the shaft passes through the aperture in a wall which comprises: (a) container means disposed upon the wall and around the shaft and around the aperture in the wall; (b) resilient p

A seal adapted to prevent fluid leakage through the clearance between a moving shaft and the edge of an aperture where the shaft passes through the aperture in a wall which comprises: (a) container means disposed upon the wall and around the shaft and around the aperture in the wall; (b) resilient packing material disposed in the container means around the shaft; (c) end ring disposed within the container means around the shaft over the clearance between the shaft and the edge of the aperture and adjacent the packing material, the end ring comprising particles of flexible graphite and an amorphous carbon phase binding the flexible graphite particles together; and (d) compression means to compress the end ring and packing material in the direction of the shaft axis to cause the packing material to conform to the interior space of the container means and the shape of the shaft to provide a seal, and to cause the end ring to block the clearance between the shaft and the edge of the aperture to inhibit extrusion of the packing material through the clearance.