How it Works: Renovation

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AcornVac Vacuum Plumbing Systems are ideal for renovating buildings with restrictive site and structural concerns such as post tension slab, bedrock, inappropriate inverts, a historical building categorization, and/or an embedded contaminant in the floor because they do not require trenching or cutting of slab. Buildings can be repurposed for different occupants because vacuum plumbing systems offer flexibility in layout and design, allowing fixtures to be relocated to best serve the needs of the current occupant.


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The interface of atmospheric pressure at the toilet bowl and a constant vacuum pressure in the waste piping network provides a highly efficient flush, using only ½ gallon of water.

When the push button is activated, the Extraction Valve opens, allowing atmospheric pressure to push toilet waste into the vacuum piping and toward the vacuum center. A water valve is simultaneously activated, allowing the toilet to be rinsed and refilled.

Collection Points

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Wastewater from plumbing fixtures and other collection points flows via gravity into an Accumulator (collection point), typically located behind or below the equipment. When the waste reaches a pre-determined level in the Accumulator, the controller automatically opens the normally closed extraction valve, allowing the vacuum to evacuate the collected waste into the vacuum piping network for delivery to the Vacuum Center. Overhead piping can be routed where convenient in the ceiling space or across an entire building in shallow trenching.

Vacuum Center

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The Vacuum Center includes vacuum pumps, waste collection tanks and controls that automate the operation of the system. Waste is delivered from fixtures and equipment to the vacuum center waste collection tanks via the vacuum piping network, where it is temporarily held before discharge to sanitary sewer mains or waste treatment facilities.
The vacuum system may also include sewage grinding and discharge pumps to pump waste from the collection tanks into the sewer.