US 2015/0316010 A1 · 3-Way Valve Assembly

Abstract

The present invention relates to a 3-way valve assembly (102; 202; 302) for a fuel injector (101; 201; 301). The valve assembly (102; 202; 302) includes a valve body (103; 203; 303), a movable valve member (104; 204; 304), and an armature (113; 213; 313) for actuating the valve member (104; 204; 304). The armature (113; 213; 313) is disposed in an armature cavity (115; 215; 315). The valve member (104; 204; 304) is configured to control an operating pressure in a control chamber (105). The valve body (103; 203; 303) includes a bore (117; 217; 317) in which the valve member (104; 204) is disposed. A leak vent (121; 221) is provided for venting fuel leaking through the bore (117; 217) past said valve member (104; 204). In an alternate embodiment, a partitioning member (333) is disposed in the armature cavity (315).

Claims14

Dependent claims

A 3-way valve assembly of a fuel injector, the valve assembly comprising:

a movable valve member configured to control an operating pressure in a control chamber;
an armature for actuating the valve member, the armature being disposed in an armature cavity;
and
a valve body having a bore in which the valve member is disposed;
wherein the armature cavity is maintained at a pressure which is lower than the operating pressure in the control chamber, so that in use, a permanent leakage of fuel occurs between the valve member and the valve body;
wherein a leak vent is provided for venting fuel leaking through the bore past said valve member;
wherein in use, the leak vent vents at least some of the permanent stem leakage of fuel way from the armature chamber.

4 more elements

Dependencies are inferred from the claim text.

3-Way Valve Assembly

Life of this patent

3-Way Valve Assembly

Life of this patent

Abstract

Claims14