NAC445A.65575. “Atmospheric vacuum breaker” defined.

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“Atmospheric vacuum breaker” means a vacuum breaker that contains an air inlet valve, a check seat and one or more air inlet ports, in which:

     1. The flow of water causes the air inlet valve to close the air inlet ports; and

     2. When the flow of water stops:

     (a) The air inlet valve falls and forms a check valve against backsiphonage; and

     (b) The air inlet ports open to allow air to enter and satisfy the vacuum.

(Added to NAC by Bd. of Health, eff. 2-20-97)

                    
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