In relatively rare situations, a downward slope out of a building to the sewer cannot be created, and a special collection pit and grinding lift 'sewage ejector' pump are needed. It is critical that a sufficient downward slope be maintained throughout, to keep liquids and entrained solids flowing freely towards the main drain from the building. Overview Pressure Vs Flow In PipeĭWV systems maintain neutral air pressure in the drains, allowing free flow of water and sewage down drains and through waste pipes by gravity. As the water runs down air must be allowed into the waste pipe either through a roof vent, or the 'drain waste vent.' (or DWV) As the water runs down, proper venting is required to avoid a vacuum from being created. Waste is produced at fixtures such as toilets, sinks, and showers. In modern plumbing, a drain-waste-vent (or DWV) is part of a system that allows air to enter a plumbing system to maintain proper air pressure to enable the removal of sewage and greywater from a dwelling. Soil stack is connected to the sewer at the bottom and vented at the top, while each plumbing fixture has its own trap.
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