Fluid transfer device with pressure equilibrium valve

A portable device useful for charging a fuel to an on-board fuel tank of a motorized vehicle, comprising:

• I) a coupler comprising:
• a) a base having a central bore and a shrouding enclosure disposed about said central bore, said shrouding enclosure comprising an interior volume and having an outlet tube attached thereto;
• b) a cover having an inner wall, attached to said base said inner wall of said cover comprising a tapered bore;
• c) a first quasi-cylindrical sleeve slidably disposed within said cover,
• said first quasi-cylindrical sleeve having a top surface, an interior wall surface, an exterior wall surface, a hollow interior, an open bottom, and an open top, said open top having a first seat and a second seat;
• d) a second quasi-cylindrical sleeve slidably disposed within said cover,
• said second quasi-cylindrical sleeve having a top surface, an interior wall surface, an exterior wall surface, a hollow interior, an open bottom, and an open top, said open top having a third seat,
• said first quasi-cylindrical sleeve being slidably disposed within the hollow interior of said second quasi-cylindrical sleeve, and wherein said second seat at the top of said first quasi-cylindrical sleeve is disposed to sealingly-engage said third seat;
• e) a poppet within said cover centrally located with respect to said first seat, aid poppet having a top surface and a periphery, said poppet being configured and disposed to provide a selectively-engageable seal with said first seat,
• said seal between said first seat and said periphery being maintained by said first sleeve being mechanically biased towards a normally-closed position with respect to the first quasi-cylindrical sleeve by means of a first spring,
• said seal between said second seat and said third seat being maintained by said second quasi-cylindrical sleeve being mechanically biased towards a normally-closed position with respect to said first quasi-cylindrical sleeve by means of a second spring,
• said first and second sleeves being configured and disposed sufficiently to enable, upon application of force to said first and second sleeves against the force of said first and second springs, the first opening of a first passage suitable for flow of vapor therethrough, and the subsequent opening of a second passage that is separate and distinct from said first passage suitable for flow of a liquid therethrough, said first passage being bounded by said exterior wall surface of said first quasi-cylindrical sleeve and the interior wall surface of said second quasi-cylindrical sleeve, said second passage being through said interior of said first quasi-cylindrical sleeve;
• II) a fuel reservoir having an outlet that is in fluid communication with said central bore;
• III) a vapor tube in fluid communication with both of said fuel reservoir and said passage suitable for flow of vapor therethrough;
• and
• IV) a two-way pressure equilibrium valve present at any location along said vapor tube, said pressure equilibrium valve being configured to selectively admit air from the external surroundings into said vapor tube and discharge excess pressure present in said fuel reservoir, in response to changing conditions in the environment external to said device.