COMPACT APPARATUS FOR EVERTING A LINER AND METHOD

摘要

A compact apparatus (201) for everting a liner utilizing fluidpressure after the liner has been aligned with the conduit to belined is provided. The apparatus includes a sphincter valve (203)with its axis aligned with the conduit to be lined and an eversionpressure chamber (204) overlapping a portion of the sphincter valvefor reducing the length of the apparatus and allowing positioning ina sewer manhole. A downtube (202) is positioned at the input sideof the sphincter valve which can extend to the top of the manhole.To install a liner, the apparatus is placed in the entrance manholewith the sphincter valve (203) aligned with the axis of the sewerpipe, the liner is inserted into the downtube (202), turned to alignwith the sphincter valve and conduit and fluid pressure is applied tothe valve to engage the flattened liner which after passing throughthe valve is everted by fluid pressure as it enters the sewer pipe.