Liquid dispensing and vapor recovery system utilizing an injector and an improved vapor flow control unit

Claim 1

A liquid dispensing and vapor recovery system comprising storage means for said liquid, dispensing means for dispensing said liquid to a receptacle, first conduit means adapted to connect said storage means to said dispensing means, pump means for pumping said liquid from said storage means through said first conduit means and to said dispensing means, second conduit means connected to said first means and to said storage means for diverting a portion of said liquid in said first conduit means back to said storage means, a housing defining a first passage forming a portion of said first conduit means and a second passage communicating with said first passage and forming a portion of said second conduit means, first valve means disposed in said first passage and movable in response to changes in the flow rate of said liquid through said first conduit means, means responsive to the absence of a predetermined liquid flow rate in said first conduit means for urging said first valve means to a position in said first passage in which the flow of liquid through said first conduit means is reduced, second valve means disposed in said second passage and movable in response to said movement of said first valve means for continuously changing the flow rate of liquid through said second passage means, said second valve means preventing the flow of liquid through said second passage upon said first valve member moving to said position, means for forming a reduced pressure zone in said second conduit means in response to liquid flow through said second conduit means, and third conduit means connected to said reduced pressure zone and to said receptacle for premitting the vapors to pass from said receptacle into said second conduit means for passage into said storage means.