Vapor recovery nozzle

In a vapour recovery dispenser nozzle having a main body portion, a discharge tube projecting from one end of the main body portion, the discharge tube having an outer end portion thereof proportioned for ease of insertion into a filling tube of a liquid storage tank, a liquid flow passage extending through said main body and said discharge tube, vapour recovery passage means formed in said main body, an extensible vapour recovery shroud having an inner end and an outer end, said inner end of said shroud being mounted on said main body and communicating with said vapour recovery passage means of said main body, said shroud being disposed radially outwardly from said discharge tube and being movable between an extended position and a retracted position with respect to said main body, said shroud being normally urged towards said extended position, a first sealing collar at the outer end of said shroud for engagement with the end of the filling tube of a gas tank during filling thereof to direct vapour which is expelled from the tank to the vapour recovery passage means in the main body by way of the shroud, a vent tube extending through the liquid flow passage to form a primary vent passage and a vacuum operated release mechanism for automatically closing the flow control valve when the level of liquid in a tank being filled thereby rises above a level sufficient to block the end of the primary vent passage of the vent tube, the improvement of

• a. sealing seat means on said filling tube, said sealing seat means being located rearwardly from said outer end portion of said filling tube to be disposed outwardly from the end of the filling tube of a liquid storage tank in use,
• b. second seal closure means disposed within said shroud and spaced a substantial distance rearwardly from said outer end of said shroud, said second seal closure means sealingly engaging said sealing seat means when said shroud is in its extended position whereby vapour which is located inwardly thereof cannot escape from within the shroud by way of the outer end thereof, said second seal closure means being moved rearwardly away from said sealing seat when said shroud is moved to its retracted position in use whereby vapour expelled from the tank during filling may be directed through the shroud to the vapour recovery passage means of the main body,
• c. a secondary vent passage means in said vent tube communicating between the primary vent passage and the liquid discharge passage in the nozzle, whereby the flow of liquid through the discharge passage may disrupt the normal venting and activate the vacuum operated release mechanism to close the flow control valve,
• d. closure means mounted within said discharge tube for movement between the first position in which said secondary vent passage is open and a second position in which said secondary vent passage is closed, and
• e. magnetic activator means carried by said shroud, said magnetic activator means moving said 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 said vacuum operated release mechanism.

In a vapour recovery liquid dispensing nozzle of the type having a vacuum operated release mechanism for automatically closing the flow control valve when the level of liquid in a tank being filled thereby rises to a level closing the end of the primary vent passage of the vent tube, the vent tube extending through the liquid discharge passage of the nozzle, and an extensible vapour recovery shroud extending about the discharge tube for directing vapour to the recovery passage of the nozzle, the shroud being movable from an extended position to a retracted position when the nozzle is operatively located within the neck of a liquid storage tank with the vapour recovery passage thereof communicating with the tank by way of the shroud, the improvement of

• a. a secondary vent passage means in said vent tube communicating between the primary vent passage and the liquid discharge passage in the nozzle, whereby the flow of liquid through the discharge passage may disrupt the normal venting and activate the vacuum operated release mechanism to close the flow control valve,
• b. closure means mounted within said discharge tube for movement between the first position in which said secondary vent passage is open and a second position in which said secondary vent passage is closed, and
• c. magnetic activator means carried by said shroud, said magnetic activator means moving said 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 said vacuum operated release mechanism.