Patent ID: 8776889

Claim:
A downhole tool, comprising a housing defining a tubular bore therethrough; a seating rim disposed about the tubular bore in the housing and having a first distal end and a first proximal end, a first planar profile of the seating rim defining a first distal perimeter at the first distal end and defining a first proximal perimeter at the first proximal end, the first proximal perimeter being asymmetrical relative to the first distal perimeter across a first centerline dividing the first distal end and the first proximal end such that the first distal perimeter has a first shape being different from a second shape of the first proximal perimeter, the first shape of the first distal perimeter conforming to a first circle, the second shape of the first proximal perimeter having first lobes disposed on either side of the first proximal end and extending outside the first circle defined by the first distal perimeter; and a flapper disposed in the housing and having a second distal end and a second proximal end, the flapper being pivotable at the second proximal end relative to the seating rim, the flapper having a sealing rim disposed about an inside surface for sealably engaging against the seating rim, a second planar profile of the sealing rim defining a second distal perimeter at the second distal end and defining a second proximal perimeter at the second proximal end, the second proximal perimeter being asymmetrical relative to the second distal perimeter across a second centerline dividing the second distal end and the second proximal end such that the second distal perimeter has a third shape being different from a fourth shape of the second proximal perimeter, the third shape of the second distal perimeter conforming to a second circle, the fourth shape of the second proximal perimeter having second lobes disposed on either side of the second proximal end of the flapper and extending outside the second circle defined by the second distal perimeter.