Patent ID: 6170539
Filing Date: 2001-01-09
Classification: B67D

Abstract:
A fuel dispenser having a variable speed vapor recovery system comprising:a) a fuel delivery system adapted to deliver fuel along a fuel delivery path from a storage tank to a vehicle during a fueling operation;b) a variable speed vapor recovery system having a vapor recovery path to deliver vapors expelled from the vehicle to the underground storage tank when fuel is delivered during a fueling operation;c) an anemometer;d) a control system for controlling said variable speed vapor recovery system, said control system coupled to said anemometer to measure a parameter corresponding to emissivity associated with vapor flowing past the anemometer during a fueling operation and adapted to determine an actual flow rate of vapor in said vapor recovery path and control the vapor recovery system accordingly;e) wherein said vapor recovery system comprises two constant speed pumps operatively connected to said control system and wherein each pump is associated with a valve controlled by said control system, wherein each of said valves is adapted to control the rate of vapor recovery within different portions of said vapor recovery path.