Detonative cleaning apparatus for industrial equipment e.g. furnace, has access conduit assembly comprising valve and seal which has O-ring with sealing surfaces for engaging mating surfaces of insertion portion of combustion conduit

The apparatus has an access conduit assembly (140) with a valve (142) and seal (144). The conduit assembly further includes a spacer conduit (146) having an inboard end flange (148) mounted relative to the furnace wall and an outboard end flange (150) to which the valve is connected. The seal has an...

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