| 摘要 |
The unpleasant task of manually removing a sewage holding tank from a recreation vehicle at a campground, and emptying it, is avoided by operatively connecting the RV sewage system to a stationary (preferably underground) vacuum installation at the campground. While the RV is renting space at the campground it is connected to an above ground vacuum hookup (typically including a conduit and a shut-off valve, and usually also a flexible hose with a dripless free end connection), at a campsite. The hookup is, in turn, connected to at least one underground vacuum source. The vacuum source may be a vacuum pump connected to a number of vacuum tanks (one for each hookup), with a check valve (e. g. duckbill valve) isolating each vacuum tank from the others. Alternatively, the vacuum source may be a vacuum generator connected to each hookup, and a common gravity sewer pipe connected to all of the vacuum generators.
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