| 摘要 |
A vapor recovery hose assembly for connecting a liquid fuel dispensing pump to a liquid fuel dispensing nozzle includes a venturi pump for aspirating liquid fuel condensates from the vapor recovery passageway capable of useful operation over a wide range of the liquid fuel flow rates. At relatively low flow rates, all of the liquid fuel passes through the throat of a venturi tube located within the pump. As the flow rates increase, increasing amounts of the liquid fuel are bypassed around the venturi throat. In a preferred embodiment, the liquid fuel which bypasses the throat of the venturi tube flows through the bore of a hollow, bypass tube that partly surrounds the venturi tube and is spring-biased toward the upstream end of the venturi tube. The bore of the bypass tube has a conical upstream end surface which tapers from a maximum diameter at its upstream end to a minimum diameter intermediate its ends so that the separation between the two tubes increases as the bypass tube is forced further downstream with increases in the liquid fuel flow rate. Other embodiments are also disclosed.
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