Semi-cartridge seal

Abstract

A semi-cartridge seal is provided incorporating two components each comprising a plurality of preassembled parts. The first component includes an annular holder for snug but slidable positioning along a shaft and loosely supports an annular seal face structure therefrom with an O-ring seal forming a fluid tight seal between the seal face structure and the annular holder, centering the seal face structure relative to the annular holder and frictionally resisting rotation of the sell face structure relative to the annular holder, the latter being sealed relative to the associated shaft. The second component includes an annular gland insert loosely disposed about the shaft but including a centering bushing centering the gland insert relative to the shaft and the gland insert loosely supports a second seal face structure therefrom with a second O-ring seal forming a fluid tight seal between the second seal face structure and the annular gland insert and centering the second seal face structure relative to the annular gland insert, the second annular seal face structure being guidingly supported from the annular gland insert for shifting axially relative thereto and being yieldingly biased in one direction relative to the annular gland insert.