IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0894915
(2001-06-28)
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발명자
/ 주소 |
- Noll, Brad L.
- Orr, William M.
- Hurt, Timothy W.
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출원인 / 주소 |
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대리인 / 주소 |
Webb Ziesenheim Logsdon Orkin & Hanson, P.C.
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인용정보 |
피인용 횟수 :
8 인용 특허 :
14 |
초록
▼
A backflow prevention apparatus has a housing with an opening having a predetermined length. A first valve body, and a second valve body may be slidably sealed with one another, and compressed such that their combined length is less then the length of the opening. In the compressed state the valve b
A backflow prevention apparatus has a housing with an opening having a predetermined length. A first valve body, and a second valve body may be slidably sealed with one another, and compressed such that their combined length is less then the length of the opening. In the compressed state the valve bodies may be inserted within the opening of the housing and then elongated such that the ends of valve bodies engage and sliding seal with segments of the housing. A spacer may be placed between the first valve body and the second valve body to secure them within the opening. An intermediate valve body may be introduced between the first valve body and the second valve body.
대표청구항
▼
A backflow prevention apparatus has a housing with an opening having a predetermined length. A first valve body, and a second valve body may be slidably sealed with one another, and compressed such that their combined length is less then the length of the opening. In the compressed state the valve b
A backflow prevention apparatus has a housing with an opening having a predetermined length. A first valve body, and a second valve body may be slidably sealed with one another, and compressed such that their combined length is less then the length of the opening. In the compressed state the valve bodies may be inserted within the opening of the housing and then elongated such that the ends of valve bodies engage and sliding seal with segments of the housing. A spacer may be placed between the first valve body and the second valve body to secure them within the opening. An intermediate valve body may be introduced between the first valve body and the second valve body. miting a swivelling angle a of the swivelling lever. 12. Valve according to claim 1, wherein a pressure control valve section support is constructed on a valve cover, for supporting the pressure control valve. 13. Valve according to claim 11, wherein the swivelling lever has an arm by which the closing part is held, and wherein a float lever is fastened to the swivelling lever. 14. Valve according to claim 13, wherein a float is fastened to a free end of the float lever. 15. Valve according to claim 1, wherein, at a maximal filling level in a fuel tank, the venting opening for the refueling venting as well as for the operational venting is closed by the closing part and the sealing plate by way of the buoyancy caused by the float. 16. Valve according to claim 1, wherein the valve is arranged horizontally or vertically or at an angle in the fuel tank. 17. Valve according to claim 1, wherein a cross-section of the operational venting opening with its inside diameter d is designed such that the closing part also opens above the maximal opening pressure of the pressure control valve when the float no longer floats on the fuel. 18. Valve according to claim 1, wherein the refueling venting opening is opened up at a low pressure p as soon as the sealing plate can be detached by way of an operational venting valve from its sealing seat on the refueling venting opening. 19. Valve according to claim 1, wherein, when the venting openings for the refueling venting and the operational venting are closed, the pressure valve opens at a defined excess pressure p28,max in the fuel tank for compensating the pressure in the compensation volume. 20. Valve assembly mountable in a motor vehicle fuel tank compensation volume disposed in use above a fuel level in the fuel tank, said valve assembly comprising: a venting valve chamber having a refueling venting opening, a sealing plate disposed to selectively open and close the refueling venting opening, an operational venting opening in the sealing plate, a displaceable closing part disposed to selectively open and close the operational venting opening, and a fuel level responsive float assembly operable to control the displaceable closing part as a function of fuel level in the fuel tank. 21. Valve assembly according to claim 20, comprising a valve cover member connected to the valve chamber; wherein said refueling venting opening is provided in said valve cover member, and wherein the sealing plate and closing part are supported at the valve cover member. 22. Valve assembly according to claim 20, comprising a pressure control valve operable to open in response to a predetermined excess pressure in the compensation volume. 23. Valve assembly according to claim 21, comprising a pressure control valve operable to open in response to a predetermined excess pressure in the compensation volume. 24. Valve assembly according to claim 22, wherein said pressure control valve is supported at a valve cover member. 25. Valve assembly according to claim 20, wherein a conical section is constructed on the closing part, the conical section being fastened to a displaceable plate, and wherein at least one stop is provided on the sealing plate, which stop is used for opening the refueling venting opening. 26. Valve assembly according to claim 21, wherein a conical section is constructed on the closing part, the conical section being fastened to a displaceable plate, and wherein at least one stop is provided on the sealing plate, which stop is used for opening the refueling venting opening. 27. Valve assembly according to claim 25, wherein an exterior guide is constructed on the sealing plate, which exterior guide protrudes into the valve chamber, to guide the sealing plate to be displaced only in the direction of the longitudinal axis. 28. Valve assembly according to claim 26, wherein an exterior guide is constructed on the sealing plate, which exterior guide protrudes into the valve chamber, to guide the sealing plate to be displaced only in the direction of the longitudinal axis. 29. Valve assembly according to claim 27, wherein an interior guide is formed in the exterior guide of the sealing plate, and wherein the closing part is guided in the direction of the longitudinal axis by the interior guide. 30. Valve assembly according to claim 28, wherein an interior guide is formed in the exterior guide of the sealing plate, and wherein the closing part is guided in the direction of the longitudinal axis by the interior guide. 31. Valve assembly according to claim 21, wherein the exterior guide of the sealing plate protrudes into a tube shaped section of the valve cover member, and wherein an inside diameter of the tube shaped section is an inside diameter of the refueling venting opening. 32. Valve assembly according to claim 28, wherein the exterior guide of the sealing plate protrudes into a tube shaped section of the valve cover member, and wherein an inside diameter of the tube shaped section is an inside diameter of the refueling venting opening. 33. Valve assembly according to claim 21, wherein the valve chamber has a flange, wherein a seal is arranged between the flange of the valve chamber and a flange of a valve cover member, and wherein hooks or the like are formed on the valve cover member which reach around the flange of the valve chamber and fasten the valve cover member to the valve chamber, and wherein, on the respective opposite side of the flange of the valve cover member, another seal is arranged which is used for sealing off the refueling venting opening when the sealing plate rests against the seal. 34. Valve assembly according to claim 28, wherein the valve chamber has a flange, wherein a seal is arranged between the flange of the valve chamber and a flange of a valve cover member, and wherein hooks or the like are formed on the valve cover member which reach around the flange of the valve chamber and fasten the valve cover member to the valve chamber, and wherein, on the respective opposite side of the flange of the valve cover member, another seal is arranged which is used for sealing off the refueling venting opening when the sealing plate rests against the seal. 35. Valve assembly according to claim 20, wherein the valve chamber has a flange, wherein a seal is arranged between the flange of the valve chamber and a flange of a valve cover member, and wherein hooks or the like are formed on the valve cover member which reach around the flange of the valve chamber and fasten the valve cover member to the valve chamber, and wherein, on the respective opposite side of the flange of the valve cover member, another seal is arranged which is used for sealing off the refueling venting opening when the sealing plate rests against the seal. 36. Valve assembly according to claim 21, wherein said fuel level responsive float assembly is supported on the valve cover member and includes a swivelling lever, a holding device for the swivelling lever, and a stop for limiting the swivel movements of the swivelling lever. 37. Valve assembly according to claim 20, wherein, at a maximal filling level in a fuel tank, the venting opening for the refueling venting as well as for the operational venting is closed by the closing part and the sealing plate by way of the buoyancy caused by the float assembly. 38. Valve assembly according to claim 22, wherein a cross-section of the operational venting opening with its inside diameter d is designed such that the closing part also opens above the maximal opening pressure of the pressure control valve when the float no longer floats on the fuel. 39. Valve assembly according to claim 20, wherein the refueling venting opening is opened up at a low pressure p as soon as the sealing plate can be detached by way of an operational venting valve from its sealing seat on the refueling venting opening. 40. Valve assembly according to claim 21, wherein the refueling venting opening is opened up at a low pressure p as soon as the sealing plate can be detached by way of an operational venting valve from its sealing seat on the refueling venting opening. 41. Valve assembly according to claim 22, wherein, when the venting openings for the refueling venting and the operational venting are closed, the pressure control valve opens at a defined excess pressure p28,max in the fuel tank for compensating the pressure in the compensation volume. 42. Fuel tank assembly for a motor vehicle comprising at least one fuel tank chamber with an integrated compensation volume above an in use fuel level, a valve assembly in the compensation volume for each tank chamber, a vent line leading to atmosphere connected to the respective valve assemblies, and at least one rollover valve connected to the vent line outside the fuel tank, wherein each valve assembly comprises: a venting valve chamber having a refueling venting opening, a sealing plate disposed to selectively open and close the refueling venting opening, an operational venting opening in the sealing plate, a displaceable closing part disposed to selectively open and close the operational venting opening, and a fuel level responsive float assembly operable to control the displaceable closing part as a function of fuel level in the fuel tank. 43. Fuel tank assembly according to claim 42, wherein a plurality of tank chambers are provided, and wherein each tank chamber has an associated valve assembly. 44. Fuel tank assembly according to claim 42, wherein each valve assembly comprises a valve cover member connected to the associated valve chamber, wherein the refueling venting opening for the valve assembly is provided in said valve cover member with the sealing plate and closing part supported at said valve cover member. 45. Fuel tank assembly according to claim 44, comprising a pressure control valve operable to open in response to a predetermined excess pressure in the compensation volume. 46. Fuel tank assembly according to claim 45, wherein said pressure control valve is supported at the valve cover member.
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