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A system for preventing overflow in a storage tank which is fillable via a nozzle inserted in a fill passage includes a nozzle stop such that when an end of the nozzle contacts the nozzle stop, the nozzle is in a fill position. The system also includes a sealing device within the fill passage, which

A system for preventing overflow in a storage tank which is fillable via a nozzle inserted in a fill passage includes a nozzle stop such that when an end of the nozzle contacts the nozzle stop, the nozzle is in a fill position. The system also includes a sealing device within the fill passage, which forms an inner sealing space via a first seal around the nozzle below a hole in the nozzle and a second seal around the nozzle above the hole in the nozzle. An airtight passage connects the inner sealing space to an interior of the storage tank. The system may also include a venting system including a tank vent passage between the storage tank and an end of the fill passage and an atmospheric vent passage between the tank vent passage and the external atmosphere.

대표청구항 ▼

What is claimed is: 1. A system for preventing overflow in a storage tank which is fillable via a nozzle, the system comprising: a fill passage connecting the storage tank to an external atmosphere; a fill fitting comprising: a mounting flange and a sleeve, wherein the mounting flange rests outside

What is claimed is: 1. A system for preventing overflow in a storage tank which is fillable via a nozzle, the system comprising: a fill passage connecting the storage tank to an external atmosphere; a fill fitting comprising: a mounting flange and a sleeve, wherein the mounting flange rests outside the external end of the fill passage and the sleeve fits within the fill passage; a nozzle stop, disposed within the sleeve of the fill fitting, having an internal lip, wherein the inner diameter of the lip is less than the outer diameter of an end of the nozzle; a sealing device, disposed within the sleeve of the fill fitting above the nozzle stop, the sealing device comprising a first inner seal and a second inner seal and a first outer seal and a second outer seal and a hole in a wall of the sealing device between the first inner and outer seals and the second inner and outer seals; a pressure transfer passage having a first end disposed at a specific level within the storage tank and a second end communicating with a hole in the fill passage and a corresponding hole in the fill fitting; wherein the nozzle is in a fill position when the end of the nozzle is in contact with the nozzle stop; when the nozzle is in the fill position, the first inner seal forms a seal around the nozzle below a hole in the nozzle and below the hole in the sealing device and the second inner seal forms a second seal around the nozzle above the hole in the nozzle and above the hole in the sealing device, thereby forming an inner sealing space; when the nozzle is in the fill position, the first outer seal forms a seal between the sealing device and the fill fitting below the hole in the sealing device and below the hole in the fill fitting and the second outer seal forms a seal above the hole in the sealing device and above the hole in the fill fitting. 2. The system according to claim 1, further comprising a positioning sleeve, disposed within the fill fitting above the sealing device, the positioning sleeve comprising a substantially cylindrical central portion, an upper flange, and a lower flange, wherein the inner diameter of the central portion is larger than the outer diameter of the nozzle. 3. The system according to claim 2, wherein: there is at least one hole in the upper flange of the positioning sleeve; there is a hole in the fill fitting and a corresponding hole in the fill passage, which are positioned between the upper and lower flanges of the positioning sleeve; the system further comprises: a tank vent passage between the storage tank and the corresponding holes in the fill fitting and the fill passage between the upper and lower flanges of the positioning sleeve, capable of transmitting air from the storage tank to the atmosphere; an atmospheric vent passage between the tank vent passage and the external atmosphere, connected to the tank vent passage via first and second valves; wherein the first valve is a check valve which permits the passage of air from the atmosphere to the tank vent passage, but does not permit passage of air from the tank vent passage to the atmosphere; and wherein the second valve is a pressure relief valve which permits passage of air or fuel at a pressure of greater than or equal to a specific pressure from the tank vent passage to the atmosphere and prevents passage of air or fuel at a pressure of less than the specific pressure. 4. The system according to claim 3, wherein the specific pressure is 1 psi or greater. 5. The system according to claim 1, wherein the first inner seal, the second inner seal, the first outer seal, and the second outer seal are each one of: one or more flexible O-rings, and a flexible washer. 6. A system for preventing overflow in a storage tank which is fillable via a nozzle inserted in a fill passage, the system comprising: a nozzle stop, disposed within the fill passage, wherein the nozzle is in a fill position when an end of the nozzle is in contact with the nozzle stop; a sealing device, disposed within the fill passage above the nozzle stop, comprising a first inner seal and a second inner seal, wherein, when the nozzle is in the fill position, the first inner seal forms a seal around the nozzle above a hole in the nozzle and the second inner seal forms a seal around the nozzle below the hole in the nozzle, thus forming an inner sealing space; and an airtight passage between the inner sealing space and an interior of the storage tank; wherein the sealing device further comprises a hole disposed between the first inner seal and the second inner seal; and a first outer seal below the hole and a second outer seal above the hole, thereby forming an outer sealing space; and wherein the passage between the inner sealing space and the storage tank comprises the hole in the sealing device, the outer sealing space, a hole in the fill passage, and a pressure transfer passage between the hole in the fill passage and the storage tank. 7. The system according to claim 6, wherein the first inner seal, the second inner seal, the first outer seal, and the second outer seal are each one of: one or more flexible O-rings, and a flexible washer. 8. A venting system for a storage tank, comprising: a fill passage connecting the storage tank to an external atmosphere and having a hole therein; a fill fining comprising a sleeve fitted within the fill passage and having a hole therein corresponding to the hole in the fill passage; a positioning sleeve, disposed within the fill fitting, comprising: a substantially cylindrical central portion having an inner diameter larger than an outer diameter of a fill nozzle, an upper flange having at least one hole therein, and a lower flange, wherein the holes in the fill passage and in the fill fitting lie between the upper and lower flanges of the positioning sleeve; a tank vent passage between the storage tank and the hole in the fill passage, such that the storage tank communicates with the external atmosphere via the tank vent passage, the hole in the fill passage, the hole in the fill fitting, and the hole in the upper flange of the positioning sleeve; and an atmospheric vent passage between the tank vent passage and the external atmosphere, connected to the tank vent passage via first and second valves; wherein the first valve is a check valve which permits passage of air from the atmosphere to the tank vent passage, but does not permit passage of air from the tank vent passage to the atmosphere; and wherein the second valve is a pressure relief valve which permits passage of air at a pressure of greater than or equal to a specific pressure from the tank vent passage to the atmosphere and prevents passage of air at a pressure of less than the specific pressure. 9. The system according to claim 8, further comprising at least one hole in the lower flange of the positioning sleeve. 10. The system according to claim 8, wherein the specific pressure is 1 psi or greater.