| 摘要 |
Flow through a vapor recovery nozzle is stopped when the liquid in a tank being filled reaches a predetermined level to cause a first diaphragm, which forms a wall of a first chamber, to move a latch release mechanism against the force of a single spring. Flow through the nozzle also is stopped when pressure in the tank being filled exceeds a predetermined pressure through movement of a second diaphragm, which is disposed in a plane substantially perpendicular to the plane of the first diaphragm and forms a wall of a second chamber connected by two separate passages to a vapor return passage communicating the tank with vapor recovery equipment, to cause movement of the latch release mechanism in the same direction and against the force of the same spring. The first diaphragm is prevented from moving in response to the pressure in the tank increasing. The exterior of each of the first and second diaphragms is exposed to ambient pressure.
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