Vapor-recovery-activated auto-shutoff nozzle, mechanism and system

A vapor-recovery-activated auto-shutoff fluid exchange system for concurrently pumping liquid from a source container to a destination container and pumping vapor from said destination container to said source container, said vapor-recovery-activated auto-shutoff fluid exchange system comprising:

• a source container having a substantially hollow interior for retaining liquid and vapor therein;
• a liquid and vapor pumping means for pumping liquid from said source container to said destination container and for pumping vapor from said destination container to said source container, and having a liquid inlet, a liquid outlet, a vapor inlet and a vapor outlet;
• wherein said liquid inlet and said vapor outlet of said liquid and vapor pumping means are connected in fluid communication with said substantially hollow interior of said source container;
• a nozzle having a liquid delivery conduit having a liquid-receiving inlet and a liquid-dispensing outlet and vapor recovery conduit having a vapor-receiving inlet and a vapor-conveying outlet;
• liquid delivery means for delivering liquid from said liquid outlet of said liquid and vapor pumping means to said liquid-receiving inlet of said nozzle;
• vapor delivery means for delivering vapor from said vapor-conveying outlet of said nozzle to said vapor inlet of said liquid and vapor pumping means;
• a selectively controllable actuation mechanism for actuating said liquid and vapor pumping means;
• an openable and closable valve means selectively movable between a valve-closed configuration whereat liquid is precluded from being dispensed from said liquid-dispensing outlet of said liquid delivery conduit and a valve-open configuration whereat liquid is permitted to be dispensed from said liquid-dispensing outlet of said liquid delivery conduit
• biasing means for biasing said valve means to said valve-closed configuration;
• manually operable trigger means movable between a rest position and at least one in-use position, for permitting selective operation of said valve means between said valve-closed configuration and said valve-open configuration;
• linkage means operatively connecting said manually operable trigger means and said valve means;
• wherein said linkage means is re-configurable between an enabled configuration whereat said valve means is controllable via said manually operable trigger means, such that said rest position of said manually operable trigger means corresponds to said valve-closed configuration of said valve means and said in-use position of said manually operable trigger means corresponds to said valve-open configuration of said valve means, and a disabled configuration whereat said manually operable trigger means is precluded from controlling said valve means, and said valve means is therefore biased to said valve-closed configuration;
• and,
• deactivation means for re-configuring said linkage means from said enabled configuration to said disabled configuration, in response to a condition of the fluid in said vapor recovery conduit, thereby precluding said openable and closable valve means from being controlled by said manually operable trigger means to its valve-open configuration, until said linkage means is reset to its enabled configuration.