Importance

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Abstract

A high temperature water-cooled gas-tight lubricated steel plug valve for handling abrasive particulates (such as iron ore or sponge iron) having a water-cooled hollow double-walled housing with opposing inlet and outlet, a hollow internally-baffled axially water-cooled cylindrical plug with a transverse flow pipe defining a bore therethrough, at least one relatively thin-walled replaceable iron wear liner of generally cylindrical shape having corresponding bore passages and being positioned around said plug member and fixedly keyed within said housing whereby wear is generally limited to the relatively-moving interfacing inner surface of the wear liner and the outer surface of the plug member. The plug being machinable to restore the proper shape and tolerances when combined with replacement of the wear liner by one of compensatingly greater thickness. In a second embodiment, the one wear member may be fixed to the outer surface of the plug member, whereby any wear occurs between the outer surface of the wear liner and the inner surface of the housing. In a third embodiment for low temperature applications, two replaceable wear liners are used, one fixed to the housing and one fixed to the plug member where the abrasive action of the solids affects only the meeting surfaces of the two concentrically mounted wear liners.

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First Claim