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A flapper valve with a protective hinge pin sleeve. The valve includes a flapper assembly having a flapper with the protective hinge pin sleeve disposed through an ear of the flapper. The hinge pin sleeve is preferably made of a relatively harder material than the flapper to reduce wear on the flapp

A flapper valve with a protective hinge pin sleeve. The valve includes a flapper assembly having a flapper with the protective hinge pin sleeve disposed through an ear of the flapper. The hinge pin sleeve is preferably made of a relatively harder material than the flapper to reduce wear on the flapper as the flapper assembly is pivoted on a pivot pin. One embodiment of a flapper valve for use in a down hole tool is disclosed.

대표청구항 ▼

A flapper assembly for use in a piece of flapper valve type floating equipment installed in a casing in a wellbore, said flapper valve type floating equipment having a seat and a hinge pin therein, said flapper assembly comprising: a flapper having a portion positionable adjacent said seat in said f

A flapper assembly for use in a piece of flapper valve type floating equipment installed in a casing in a wellbore, said flapper valve type floating equipment having a seat and a hinge pin therein, said flapper assembly comprising: a flapper having a portion positionable adjacent said seat in said flapper valve type floating equipment and having an ear extending from said portion, said flapper being constructed from soft ductile, easily wearable material which can be easily removed by drilling from said casing in said wellbore; sleeve means disposed through said ear, and secured thereto, of said flapper for receiving said hinge pin therethrough, said sleeve means being constructed of relatively hard material in relation to said flapper, said sleeve means reducing wear to said flapper by providing a bearing surface between said flapper and said hinge pin thereby preventing wear of said flapper during the rotation thereof in said flapper valve type floating equipment by confining wear during the rotation of said flapper to said sleeve and said pin while preventing rotation of said sleeve with respect to said flapper; and biasing means for biasing said portion of said flapper toward said seat, independent of the orientation of said flapper assembly.