Fuel return valve

Details Fuel return valve Fuel return valve

2005-07-19

2005-07-19

Miller, Carl S. (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel flow regulation between the pump and the charge-forming...

C123S459000, C137S514500

Reexamination Certificate

active

06918381

ABSTRACT:
A fuel return valve comprises a housing and a closing unit, a first passage, which is line-connected to a fuel pump, a second passage, which is line-connected to an internal combustion engine, and a third passage, which is line-connected to the fuel tank, as well as a pressure chamber, being formed in the housing, which pressure chamber is in communication with the first passage, and, via the closing unit, with the third passage. To make a valve of this type maintenance-free and simple and inexpensive to produce, the closing unit is a piston which is guided in the housing attachment and is pressed by a spring arranged and supported in the housing attachment onto a sealing surface which is formed on the housing and surrounds the pressure chamber, and an annular chamber which is in communication with the third passage and with the space containing the spring is formed outside the sealing surface.

REFERENCES:
patent: 4756289 (1988-07-01), Rock et al.
patent: 5720263 (1998-02-01), Frank et al.
patent: 5727529 (1998-03-01), Tuckey
patent: 5873349 (1999-02-01), Tuckey et al.
patent: 6112727 (2000-09-01), Cristiani et al.
patent: 6378500 (2002-04-01), Schreckenberger
patent: 6481418 (2002-11-01), Ristich et al.
patent: 6752170 (2004-06-01), Muramatsu et al.

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