A fuel leak prevention system and method for providing same includes a check valve for insertion into the discharge end of a spout assembly of a fuel dispensing nozzle, the check valve being located downstream of the nozzle's fuel control valve so as to prevent any leaking or dripping of fuel from t
A fuel leak prevention system and method for providing same includes a check valve for insertion into the discharge end of a spout assembly of a fuel dispensing nozzle, the check valve being located downstream of the nozzle's fuel control valve so as to prevent any leaking or dripping of fuel from the spout when the nozzle is deactivated. The check valve includes a pivoting flap that is preferably spring-loaded and predisposed to remain closed to seal the spout when there is no fuel flowing through the nozzle, but which is allowed to rotate within the spout to open the nozzle and allow the flow of fuel when the nozzle is activated. In one embodiment, the check valve can be inserted into the spout during fabrication of the nozzle. An alternate embodiment allows the retrofit of an existing nozzle by adding an extension that contains the check valve to the spout on the nozzle. The system and method disclosed has application to any liquids that are to be dispensed, including petrol, diesel, kerosene, gas oil, gas, liquid petroleum gas, av-gas, chemicals, and water.
대표청구항▼
1. A leak prevention system for use with a liquid dispensing nozzle, the nozzle in fluid communication with a liquid dispensing pump, the system comprising: a body portion;a spout assembly extending from the body portion, the spout assembly having an outlet end configured for dispensing the liquid;a
1. A leak prevention system for use with a liquid dispensing nozzle, the nozzle in fluid communication with a liquid dispensing pump, the system comprising: a body portion;a spout assembly extending from the body portion, the spout assembly having an outlet end configured for dispensing the liquid;a flow control valve in the body portion operable to allow or prevent the flow of liquid through a flow passage defined by the body portion;a hinge pin fixedly attached to an inner wall of the outlet end of the spout assembly;a shaft fixedly attached to the inner wall of the outlet end of the spout assembly upstream of the hinge pin; anda check valve comprising: a flap member pivotably attached within the spout assembly; anda closing member mounted within the spout assembly and oriented to engage the flap member to apply a closing force to a seating surface of the flap member inside the spout assembly;the check valve positioned within the spout assembly and downstream of the flow control valve and being responsive to the flow of liquid through the body portion and into the spout assembly; andwherein the check valve is biasedly disposed to remain closed when no liquid is flowing through the nozzle so as to retard liquid from dripping from the outlet end of the spout assembly when the nozzle is not activated, andwherein one end of the closing member is attached to the shaft and an opposing end of the closing member is attached to the seating surface of the flap member such that the closing member is in constant communication with at least a portion of the seating surface of the flap member. 2. The system of claim 1, wherein the check valve is located in proximity to the outlet end of the spout assembly. 3. The system of claim 1, wherein the check valve further comprises: a stop member positioned inside the spout assembly and adapted to provide a seating area for the seating surface of the flap member and for preventing the flap member from rotating beyond a preset orientation;wherein the closing force applied by the closing member is large enough to cause the seating surface of the flap member to remain seated when the nozzle is not activated, but the closing force is not so large to prevent the flap member from rotating to substantially open the spout assembly and allow the flow of liquid when the nozzle is activated. 4. The system of claim 1, wherein the closing member is a spring. 5. The system of claim 1, wherein the flap member further comprises a tab located in proximity to an outer edge of the flap member, the tab having a bore through a longitudinal axis of the tab and configured to receive the hinge pin such that the flap member can rotate about the longitudinal axis. 6. The system of claim 5, wherein the stop member contains a groove adapted to receive at least a portion of the tab to allow the flap member to rotate within the spout assembly and fully seat against the stop member with minimal interference from the inner wall. 7. The system of claim 1, wherein at least a portion of the seating surface of the flap member is constructed of an elastomeric material; and wherein the seating surface of the flap member further comprises a reinforced portion substantially centrally located and configured to receive the closing member so as to distribute the closing member force across the flap member. 8. A leak prevention system for use with a liquid dispensing nozzle, the nozzle being in fluid communication with a liquid dispensing pump and including a body portion, a spout assembly extending from the body portion, the spout assembly having an outlet end configured for dispensing the liquid, and a flow control valve in the body portion operable to allow or prevent the flow of liquid through a flow passage defined by the body portion, the system comprising: a spout extension configured to be fixedly attached to the outlet end of the spout assembly and having an outlet end configured for dispensing the liquid;a hinge pin fixedly attached to an inner wall of the outlet end of the spout extension;a shaft fixedly attached to the inner wall of the outlet end of the spout extension upstream of the hinge pin; anda check valve comprising: a flap member pivotably attached within the spout extension; anda closing member mounted within the spout extension and oriented to engage the flap member to apply a closing force to a seating surface of the flap member inside the spout extension;the check valve positioned within the spout extension and downstream of the flow control valve and being responsive to the flow of liquid through the body portion and into the spout assembly and the spout extension;wherein the check valve is biasedly disposed to remain closed when no liquid is flowing through the nozzle so as to retard liquid from dripping from the outlet end of the spout extension when the nozzle is not activated; andwherein one end of the closing member is attached to the shaft and an opposing end of the closing member is attached to the seating surface of the flap member such that the closing member is in constant communication with at least a portion of the seating surface of the flap member. 9. The system of claim 8, wherein the check valve is located in proximity to the outlet end of the spout extension. 10. The system of claim 9, wherein the check valve further comprises: a stop member positioned inside the spout extension and adapted to provide a seating area for the seating surface of the flap member and for preventing the flap member from rotating beyond a preset orientation;wherein the closing force applied by the closing member is large enough to cause the seating surface of the flap member to remain seated when the nozzle is not activated, but the closing force is not so large to prevent the flap member from rotating to substantially open the spout extension and allow the flow of liquid when the nozzle is activated. 11. The system of claim 10, wherein the closing member is a spring. 12. The system of claim 11, wherein the flap member further comprises a tab located in proximity to an outer edge of the flap member, the tab having a bore through a longitudinal axis of the tab and configured to receive the hinge pin such that the flap member can rotate about the longitudinal axis. 13. The system of claim 11, wherein the stop member contains a groove adapted to receive at least a portion of the tab to allow the flap member to rotate within the spout extension and fully seat against the stop member with minimal interference from the inner wall. 14. The system of claim 8, wherein at least a portion of the seating surface of the flap member is constructed of an elastomeric material; and wherein the seating surface of the flap member further comprises a reinforced portion substantially centrally located and configured to receive the closing member so as to distribute the closing member force across the flap member. 15. A leak prevention system for use with a liquid dispensing nozzle, the nozzle in fluid communication with a liquid dispensing pump, the system comprising: a body portion;a spout assembly extending from the body portion, the spout assembly having an outlet end configured for dispensing the liquid;a flow control valve in the body portion operable to allow or prevent the flow of liquid through a flow passage defined by the body portion;a hinge pin fixedly attached to an inner wall of the outlet end of the spout assembly;a shaft fixedly attached to the inner wall of the outlet end of the spout assembly upstream of the hinge pin; anda check valve comprising: a flap member pivotably attached within the spout assembly, the flap member comprising a tab located in proximity to an outer edge of the flap member, the tab having a bore through a longitudinal axis of the tab and configured to receive the hinge pin such that the flap member can rotate about the longitudinal axis; anda spring mounted within the spout assembly and oriented to engage the flap member to apply a closing force to a seating surface of the flap member inside the spout assembly, wherein one end of the spring is attached to the shaft and an opposing end of the spring is attached to the seating surface of the flap member such that the spring is in constant communication with at least a portion of the seating surface of the flap member;a stop member positioned inside the spout assembly and adapted to provide a seating area for the seating surface of the flap member and for preventing the flap member from rotating beyond a preset orientation, wherein the stop member contains a groove adapted to receive at least a portion of the tab to allow the flap member to rotate within the spout assembly and fully seat against the stop member with minimal interference from the inner wall;wherein the closing force applied by the spring is large enough to cause the seating surface of the flap member to remain seated when the nozzle is not activated, but the closing force is not so large to prevent the flap member from rotating to substantially open the spout assembly and allow the flow of liquid when the nozzle is activated;the check valve positioned within the spout assembly and downstream of the flow control valve and being responsive to the flow of liquid through the body portion and into the spout assembly; andwherein the check valve is biasedly disposed to remain closed when no liquid is flowing through the nozzle so as to retard liquid from dripping from the outlet end of the spout assembly when the nozzle is not activated. 16. The system of claim 15, wherein at least a portion of the seating surface of the flap member is constructed of an elastomeric material. 17. The system of claim 15, wherein the seating surface of the flap member further comprises a reinforced portion substantially centrally located and configured to receive the closing member so as to distribute the closing member force across the flap member.
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이 특허에 인용된 특허 (9)
Reep Alan J. (Box 111 Stanley ND 58784), Check valve device for a fuel pump nozzle.
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