(a) Excess flow valves (EFVs) to be used on service lines that operate continuously throughout the year at a pressure not less than 10 psig (69 kPa) must be manufactured and tested by the manufacturer according to an industry specification, or the manufacturer's written specification, to ensure that each valve will:

1. (1) function properly up to the maximum operating pressure at which the valve is rated;
2. (2) function properly at all temperatures reasonably expected in the operating environmental of the service line;

3. (3) at 10 psig (69 kPa) close at, or not more than 50 percent above, the rated closure flow rate specified by the manufacturer and upon closure, reduce the gas flow to the level indicated:

   1. (i) for an excess flow valve designed to allow pressure to equalize across the valve, no more than five percent of the manufacturer's specified closure flow rate, up to a maximum of 20 cubic feet (0.566 cubic meter) per hour; or
   2. (ii) for an excess flow valve designed to prevent equalization of pressure across the valve, no more than 0.4 cubic foot (0.011 cubic meter) per hour; and
4. (4) not close when the pressure is less than the manufacturer's minimum specified operating pressure and the flow rate is below the manufacturer's minimum specified closure flow rate.