14 CAR § 20-112. Air/vacuum relief valves

(a)(1) Air/vacuum relief valves provide a means for releasing air at the start of a dose cycle so the system will: (A) Charge quickly with wastewater; and (B) Allow air to enter the system quickly at the end of the dose cycle. (2) Air/vacuum valves shall be located at the highest points of either: (A) Supply or return manifolds; or (B) Both. (b)(1) Air/vacuum relief valves shall be sized based on the proposed design flow rate. (2) A valve that is undersized will not provide an adequate amount of airflow. (c) A Schrader valve shall be provided at each vacuum valve as a means of checking the pressure of the drip field.