(a) Any backflow prevention device required by the Village of Silver Lake shall be of a model or construction approved by the Water Utilities Superintendent/Service Director and the Director of the Ohio Environmental Protection Agency or his duly authorized representative and shall comply with the following:
(1) An air gap separation to be approved shall have vertical separation of at least twice the diameter of the supply pipe, measured vertically above the top rim of the vessel or overflow pipe, whichever is lower, but in no case less than one inch vertical separation. If affected by a near wall, the vertical separation shall be at least three times the diameter of the supply pipe and a minimum of one and one-half inch. The horizontal separation shall be at least three times the diameter or a minimum of one and one-half inch from a sidewall, if this sidewall extends above the overflow. For two intersecting walls extending above the overflow the horizontal separation shall be at least four times the diameter or a minimum two feet from the nearest sidewall.
(2) A double check valve assembly or a reduced pressure principle backflow prevention device shall be approved by the Water Utilities Superintendent/Service Director and shall appear on the current list of approved backflow prevention devices of the Ohio Environmental Protection Agency.
(3) Interchangeable connection to be approved shall be either a swing type connector or a four-way valve of the lubricated plug type that operates through a mechanism which unseats the plug, turns it ninety degrees and re-seats the plug. Four-way valves shall not be used as stop valves but must have separate stop valves on each pipe connected to the valve. The telltale port on the four-way valve shall have no piping connected and the threads or flange of this port shall be destroyed so that a connection cannot be made.
(b) Existing backflow prevention devices approved by the Water Utilities Superintendent/Service Director or the Ohio Environmental Protection Agency at the time of installation and properly maintained shall, except for inspection and maintenance requirements, be excluded from the requirements of subsection (a) hereof providing the Water Utilities Superintendent/Service Director is assured that they will satisfactorily protect the public potable water system. Whenever the existing device is moved from the present location or requires more than minimum maintenance or when the Water Utilities Superintendent/Service Director finds that the maintenance of the device constitutes a hazard to health, the device shall be replaced by a backflow protection device meeting the requirements of this chapter.
(Ord. 68-1991. Passed 10-7-91.)