| 摘要 |
An automatic dispensing nozzle of the type incorporating a vapor recovery system wherein the sealing seat for preventing the escape of recovered vapors from the system when the nozzle is not in use is located at the position along the length of the discharge tube which is not located within the filling tube of a fluid storage tank in use. The sealing seat for the vapor recovery shroud is located rearwardly from the outer end of the discharge tube and seal closure means is disposed within the shroud and spaced a substantial distance rearwardly from the outer end of the shroud to sealingly engage the sealing seat when the shroud is in its extended position. A mechanism is also provided for preventing the operation of the dispenser nozzle until the vapor recovery system of the nozzle is in communication with the interior of the tank which is to be filled by the nozzle. This mechanism consists of a simple magnetically operated mechanism for opening and closing a secondary vent passage in the vent tube of an automatic nozzle of the type having a vacuum operated release mechanism for automatically closing the flow control valve. The secondary vent passage communicates between the primary vent passage and the liquid discharge passage in the nozzle. Closure means for closing the secondary vent passage is mounted within the discharge tube for movement between a first position in which the secondary vent passage is opened and a second position in which the secondary vent passage is closed and magnetic activator means is carried by the shroud for moving the closure means to said open position when the shroud is extended whereby normal venting may be disrupted and to the closed position when the shroud is retracted, thereby permitting normal venting of the vacuum operated release mechanism.
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