Fuel system and ecology valve for use therein

Details Fuel system and ecology valve for use therein Fuel system and ecology valve for use therein

2007-11-05

2011-12-27

Fristoe, Jr., John (Department: 3753)

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

C251S062000

Reexamination Certificate

active

08083204

ABSTRACT:
A fuel system comprises a pressure raising valve operable to control communication between a fuel delivery line and an engine manifold line, and an ecology valve comprising a piston movable within a bore, the piston and bore together defining a control chamber and an ecology chamber, the ecology chamber communicating with the engine manifold line, the pressure within the control chamber being controllable to control the position occupied by the piston, the ecology valve further comprising seal means whereby, when the piston occupies a first position in which it engages the seal means, only a first, relatively small, effective area of the piston is exposed to a fuel pressure within the engine manifold line, a second, larger, effective area being exposed to the fuel pressure within the engine manifold line when the piston occupies a position in which it does not engage the seal. An ecology valve for use in the fuel system is also described.

REFERENCES:
patent: 2998020 (1961-08-01), Charasse
patent: 3841089 (1974-10-01), Clark
patent: 6195978 (2001-03-01), Futa, Jr.
patent: 6314998 (2001-11-01), Futa, Jr. et al.
patent: 6412271 (2002-07-01), Maker et al.
patent: 6751939 (2004-06-01), Futa, Jr. et al.
patent: 2002/0184884 (2002-12-01), McCarty
European Search Report dated Jul. 2, 2009.

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