| 摘要 |
<p>A vapor recovery system that recovers vapor expelled from a fuel tank of a vehicle receiving fuel through a fuel supply passage and returns the vapor to an underground storage tank through a vapor return passage including a fuel nozzle in fluid communication with the fuel supply passage and the vapor return passage, the fuel nozzle including a boot configured to form a seal with the fuel tank, a vapor passage valve configured to prevent the flow of vapor through the vapor return passage when the vapor passage valve is in a closed position, the vapor passage valve being configured to move to the closed position from an open position at a first vacuum level, and a relief valve configured to allow air into the vapor return passage at a second vacuum level, wherein the second vacuum level is more negative than the first vacuum level.</p> |
