Patent ID: 7011312

Claim:
A gland packing for a stuffing box, comprising a ring packing selected from the group consisting of knitted and plaited packings, laminated packings, graphite packings, and resin-molded packings and which can be elastically deformed by compression and has a quadrilateral cross sectional shape with inner and outer diameter sides and first and second sides extending between said inner and outer diameter sides, wherein said inner and outer diameter sides of the quadrilateral are parallel to a central axis of the gland packing, and wherein said first and second sides have slopes of the same orientation with respect to an axis perpendicular to the central axis, wherein: said inner-diameter-side has an acute angle portion and said outer-diameter-side has an acute angle portion of the quadrilateral being flat portions; and the slope angles of the first and second sides are less than 40° with respect to a plane perpendicular to the central axis.