초록 ▼

A Stage II Vapor Recovery System that provides for efficient fuel vapor collection while automatically correcting for pressure differentials between the Ambient Atmospheric Pressure and the pressure in the fueling facility's Fuel Storage Tanks (FSTs). The FSTs may be either Underground Storage Tanks

A Stage II Vapor Recovery System that provides for efficient fuel vapor collection while automatically correcting for pressure differentials between the Ambient Atmospheric Pressure and the pressure in the fueling facility's Fuel Storage Tanks (FSTs). The FSTs may be either Underground Storage Tanks (USTs) or Above Ground Storage Tanks (ASTs). The system has advantages over current Stage II systems by providing only the pressure necessary to return vapors to the FSTs without under- or over-pressurizing the FSTs, with the appropriate values of returned volume of vapor to provide Vapor to Liquid Ratios (V/Ls) that ensure efficient vapor collection. It eliminates the anticipated problems associated with earlier Stage II Vapor Recovery systems which work well with current automobile fueling systems, but have unique problems when used with the mandated Onboard Refueling Vapor Recovery (ORVR) systems.

대표청구항 ▼

[ I claim:] [1.] A vapor recovery system comprising:a fuel dispensing nozzle capable of recovering fuel vapors;a fuel dispensing hose connected at one end to said nozzle and designed for delivering fuel to and recovering fuel vapors from said fuel dispensing nozzle;a vapor recovery pump driven by a

[ I claim:] [1.] A vapor recovery system comprising:a fuel dispensing nozzle capable of recovering fuel vapors;a fuel dispensing hose connected at one end to said nozzle and designed for delivering fuel to and recovering fuel vapors from said fuel dispensing nozzle;a vapor recovery pump driven by a dispensed fuel cooperatively connected to said fuel dispensing hose for controllably collecting recovered fuel vapors;a dispensing unit for controlling fuel delivery;at least one fuel storage tank containing both fuel and vapor storage space;fuel dispensing and vapor recovery lines extending between said dispensing unit and said at least one tank;wherein said vapor recovery pump automatically adjusts the ratio of collected fuel vapors to dispensed fuel in response to changes in vapor pressure in said at least one tank in order to maintain vapor pressure in said at least one tank within a certain pre-defined range.