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FROM :WWSSTECH INC 619 4S7 811S <br />19 8-2S 23:OS #099 P.02/09 <br />~STATE OF CALIFORNIA PETE WILSON, Govenaos <br />Alit RESOURCES BOARD <br />2020 L STREET <br />P.Q. Box 2815 <br />SACRAMENTO, CA 95812 <br />February 28, 1994 <br />Detlev E. Hasselmann <br />President <br />Hasstech Inc. <br />6985 Flanders Drive <br />San Diego, California 92121 <br />#94-3 <br />Dear Mr. Hasselmann: <br />Approval of the Hasstech Model CFC -1 Flow Control Valve <br />You requested California Air Resources Board {GARB} approval of the <br />Hasstech Model CFC -1 flow control valve as an alternate to the certified <br />Hasstech 1016-33 flow control valve. <br />Both the Hasstech 1016-33 and the new CFC -1 flow control valves are <br />used on gasoline dispensers to open and close the vapor return line in <br />response to fuel flow. The currently certified 1016-33 flow control valve <br />comprises a sensor installed in the gasoline line and a hydraulically <br />operated valve in the vapor line. The sensor is connected to the vapor <br />valve by two hydraulic lines. When gasoline flows, there is a pressure drop <br />across the sensor which is- hydraulically transmitted to open the vapor <br />valve. <br />The new CFC -1 incorporates these features of the 1016-33 valve into a <br />valve body of 6 inches in length and 2 inches in diameter. Basically, the <br />CFC -1 valve has the sensor and vapor valve combined into one unit. As <br />gasoline enters the valve body, it moves a small target and stem connected <br />to the vapor seat. The seat opens up the vapor line to let the vapors flow <br />through. The valve seat closes when gasoline stops flowing. The CFC -1 <br />valve is designed to open at a.gasoline flow rate of at least 1 gallon per <br />minute (gpm)_ <br />As required by the Air Resources Board certification procedures, you <br />requested the approval of the Division of Occupational Safety and Health, <br />the Office of the State Fire Marshal and the Department of Food and <br />Agriculture, Division of Measurement Standards. The necessary approvals <br />have been obtained from these agencies. <br />I find that the use of the Hasstech CFC -1 coaxial flow control valve, <br />when installed in accordance with the manufacturer's instructions, will not <br />adversely affect the performance of vapor recovery systems on which they are <br />installed. Therefore, the Hasstech CFC-1,coaxial flow control valve as an <br />