Patent ID: 8991424
Filing Date: 2015-03-31
Classification: F02M,G05D,Y10T

Abstract:
1. A fuel pressure regulator comprising a bore within which is located a valve member moveable from a non-regulating position of the fuel pressure regulator wherein the valve member is moved in a direction away from a first end of the bore so as to engage fluidtightly a valve seat defined on the bore, to a regulating position of the fuel pressure regulator wherein the valve member is spaced apart from the valve seat, a control fuel line connection positioned at a second end of the bore, such that, in use, any fuel entering the bore through the control fuel line connection acts upon a thrust surface provided on the valve member resulting in a force acting on the valve member in a direction to disengage the valve member from the valve seat, an upper clearance between the valve member and the second end of the bore, a fuel spill line connection positioned in the bore such that, in use, any fuel entering the bore through the fuel spill line connection enters a region between the first end and the second end of the bore, characterised in that there is provided a lower clearance in the bore between the first end and the second end, and a leak passageway connected from a point between the lower clearance and the second end of the bore, and a fuel return line connection, such that, in normal operating use, a fuel flow path from the fuel spill line connection to the fuel return line connection is kept open when the fuel pressure regulator is in the non-regulating position.