Method for everting a liner using a compact apparatus

Details Method for everting a liner using a compact apparatus Method for everting a liner using a compact apparatus

1997-01-27

1999-08-24

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

156287, 156294, 264 3616, 264269, B29C 6336

Patent

active

059421835

ABSTRACT:
A compact apparatus for everting a liner utilizing fluid pressure after the liner has been aligned with the conduit to be lined is provided. The apparatus includes a sphincter valve with its axis aligned with the conduit to be lined and an eversion pressure chamber overlapping a portion of the sphincter valve for reducing the length of the apparatus and allowing positioning in a sewer manhole. A downtube is positioned at the input side of the sphincter valve which can extend to the top of the manhole. To install a liner, the apparatus is placed in the entrance manhole with the sphincter valve aligned with the axis of the sewer pipe, the liner is inserted into the downtube, turned to align with the sphincter valve and conduit and fluid pressure is applied to the valve to engage the flattened liner which after passing through the valve is everted by fluid pressure as it enters the sewer pipe.

REFERENCES:
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patent: 5167901 (1992-12-01), Driver et al.
patent: 5374174 (1994-12-01), Long, Jr.
patent: 5454401 (1995-10-01), Kamiyama et al.

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