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Alternative joint for a high pressure sealing Disclosure Number: IPCOM000028693D
Original Publication Date: 2004-Jun-25
Included in the Prior Art Database: 2004-Jun-25

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Actual sealing of high pressure joints on gasoline injectors are made up of an ogive shaped head of softer material, pressed against the seat by means of a nut with a thread. The ā€˛female" nut is usually on the tube's side, while the injector top has an external thread. In some cases, this can lead to a non perfect alignment of the parts or a difficult assembly. An alternative solution for metal to metal sealing of high pressure joints is the use of brake-type tubes with an external thread on the tube's side and an internal one on the fitting side (see fig. 1). This can provide a more stable tightening of the assembly. In addition to that, brake tubes are less expensive than the other solution.