| 摘要 |
Disclosed is an apparatus of reverse protection for a sewerage line, which is installed at a basal sewer pipe connected to a collecting tank or a distal part of a trunk sewer pipe connected from the collecting tank to a drainage canal so as to prevent a reverse flow of sewerage from the collecting tank to the basal sewer pipe or from the trunk sewer pipe to the collecting tank. The apparatus is ultimately used in the distal part of the sewer pipe which is disposed at the collecting tank, the river, the sea, the public water and the like so as to smoothly perform the normal function of draining the sewerage.
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