Backflow is the unwanted reversal of water flow – it can be caused by gravity, vacuum or other pressure changes in the plumbing lines. In addition, two other factors that can contribute to the reversal of flow in water lines. Those are back-siphonage and back-pressure.
Back-siphonage conditions happen when there is negative pressure in the supply piping so that downstream substances are siphoned into the potable water supply. Conditions that can create a vacuum, which can contribute to make back-siphonage occur, include breaks in the pipe, undersized pipes and high withdrawal rates.
The second factor, back pressure exists when a pressure higher than a supply is created in downstream piping, allowing downstream substances to be pushed into the potable water supply. Examples of when backpressure can occur include higher downstream pressures generated by elevation pumps and thermal expansion.
Selecting the correct type of backflow preventer devise requires thorough knowledge of several variables:
– The degree of hazard (high hazard or low hazard) of your home plumbing system.
– The type of backflow backpressure or back-siphonage.
– Characteristics of the system
– The type of application and the type of installation
The estimated cost to install a complete backflow valve system varies depending on the complexity, the location, and number of valves needed.
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