Patent ID: 8333178
Filing Date: 2012-12-18
Classification: F02M,Y10T

Abstract:
1. A control valve for use in controlling fuel pressure within a control chamber, the control valve comprising: i) a control valve member that is movable between a first position, in which the control chamber communicates with a source of high pressure fuel, and a second position, in which the control chamber communicates with a low pressure fuel drain and communication between the control chamber and the source of high pressure fuel is broken; ii) a first flow restriction arranged to maintain a first pressure upstream of the first flow restriction when the control valve member is in transition between the first position and the second position; and iii) a second flow restriction positioned downstream of the first flow restriction and arranged to maintain a second pressure upstream of the second flow restriction, wherein the second flow restriction is dimensioned and located relative to the first flow restriction such that in transition between the first and second positions the net force exerted on the control valve member by the first pressure balances the net force exerted on the control valve member by the second pressure.