초록 ▼

A coaxial breakaway coupling and a coaxial hose connect a fuel dispensing pump to a coaxial fuel dispensing nozzle, and the coupling includes first and second tubular valve bodies releasably coupled together by an annular canted coil spring. Each valve body supports therein an axially movable tubula

A coaxial breakaway coupling and a coaxial hose connect a fuel dispensing pump to a coaxial fuel dispensing nozzle, and the coupling includes first and second tubular valve bodies releasably coupled together by an annular canted coil spring. Each valve body supports therein an axially movable tubular valve member for defining an inner vapor return passage and an outer fuel supply passage, and a vapor return check valve member is supported for axial movement within the vapor return passage upstream of an annular valve seat. All of the valve members are spring biased towards closed positions and move to open positions when the valve bodies are coupled together. When the valve bodies are uncoupled or separate in response to an axial breakaway force, the valve members close, and suction from a vacuum pump connected to the vapor return passage pulls the check valve member towards it closed position against the valve seat. In a modification, the breakaway coupling is integrated with a 45°coaxial swivel coupling connected to a coaxial fuel dispensing nozzle.

대표청구항 ▼

A breakaway coupling for use with a flexible coaxial fuel supply hose defining a vapor return passage surrounded by a liquid fuel supply passage, said coupling comprising a first tubular valve body and a second tubular valve body disposed with a common center axis, means for releasably connecting sa

A breakaway coupling for use with a flexible coaxial fuel supply hose defining a vapor return passage surrounded by a liquid fuel supply passage, said coupling comprising a first tubular valve body and a second tubular valve body disposed with a common center axis, means for releasably connecting said valve bodies and providing for movement of said valve bodies from a connected position to a disconnected position in response to an axial tension force, each of said valve bodies having an axially extending support tube defining therein an inner vapor return passage and cooperating with the surrounding said valve body to define therebetween an axially extending outer liquid fuel supply passage, a tubular valve member supported by each of said support tubes for axial movement, each of said valve bodies including means forming an annular valve seat within the corresponding fuel supply passage, means for moving each of said valve members axially on the corresponding said support tube from a closed position engaging the corresponding said valve seat to an open position retracted axially from said valve seat in response to movement of said valve bodies from said disconnected position to said connected position, spring means for urging each of said valve members towards said closed position, at least one of said tubular valve members including means forming an annular check valve seat within the corresponding said vapor return passage, a check valve member supported for axial movement within said vapor return passage of said one valve member upstream of said valve seat with respect to the flow of vapor, means for holding said check valve member in an open position spaced from said check valve seat when said valve bodies are in said connected position, and said check valve member being pulled to a closed position against said check valve seat in response to suction within said vapor return passage downstream of said check valve member when said valve bodies are in said disconnected position.