Ported pressure relief valve

Details Ported pressure relief valve Ported pressure relief valve

2005-01-04

2005-01-04

Moulis, Thomas (Department: 3747)

Internal-combustion engines

Charge forming device

Fuel injection system

C123S511000

Reexamination Certificate

active

06837219

ABSTRACT:
A ported pressure relief valve (10) used in an automotive fuel system (F) includes an unrestricted constant bleed orifice (32) for routing pressurized fuel from a fuel pump (P) back to a fuel source (T, M) when an engine (E) is running. A check valve (30) prevents flow from a fuel system back to the fuel source when the engine is off, so to retain sufficient pressure in the delivery system that the engine will readily start when cranked. A pressure relief valve (50) drains fuel from the delivery system back to the source of fuel in response to a pressure build up in the fuel delivery system above a predetermined pressure level so to prevent an overpressure condition which would otherwise damage the fuel delivery system.

REFERENCES:
patent: 5148792 (1992-09-01), Tuckey
patent: 5289810 (1994-03-01), Bauer et al.
patent: 5339785 (1994-08-01), Wilksch
patent: 5361742 (1994-11-01), Briggs et al.
patent: 5477829 (1995-12-01), Hassinger et al.
patent: 5673670 (1997-10-01), Powell et al.
patent: 5749345 (1998-05-01), Treml
patent: 6189513 (2001-02-01), Brown et al.
patent: 6352067 (2002-03-01), Genslak

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