Abstract: A fuel system for use in an internal combustion engine, the fuel system comprising a source of high pressure fuel for supplying fuel through a single fuel supply path to an injector for injecting fuel, a first valve arrangement for controlling initiation of fuel injection and a second valve arrangement arranged in the fuel supply path, comprising a valve member which is operable between first and second positions to vary the rate of flow of fuel through the second valve arrangement, thereby to permit the fuel injection characteristics to be varied, in use.

Abstract: A fuel injector arrangement comprising a nozzle provided with a first bore within which a valve needle is slidable, the needle being engageable with a seating to control the flow of fuel from a delivery chamber to an outlet opening. The arrangement includes a surface associated with the needle which is exposed to the fuel pressure within a control chamber, and a fuel pressure actuable control valve controlling the supply of fuel to the delivery chamber.

Abstract: A fuel injector arrangement comprising a nozzle provided with a first bore within which a valve needle is slidable, the needle being engageable with a seating to control the flow of fuel from a delivery chamber to an outlet opening. The arrangement includes a surface associated with the needle which is exposed to the fuel pressure within a control chamber, and a fuel pressure actuable control valve controlling the supply of fuel to the delivery chamber.

Abstract: A fuel system, for use in supplying pressurised fuel to a combustion space, comprises a fuel source of pressurised fuel and a fluid pressure actuable valve controlling communication between the fuel source and an injection nozzle. The fuel system further comprises a second source of control fluid under pressure and a control valve controlling the application of control fluid under pressure to the fluid pressure actuable valve to control operation of the fluid pressure actuable valve. The invention also relates to a fuel injector for use in such a fuel system, the fuel injector comprising the injection nozzle, the fluid pressure actuable valve and the control valve.

Abstract: A fuel system, for use in supplying pressurised fuel to a combustion space, comprises a fuel source of pressurised fuel and a fluid pressure actuable valve controlling communication between the fuel source and an injection nozzle. The fuel system further comprises a second source of control fluid under pressure and a control valve controlling the application of control fluid under pressure to the fluid pressure actuable valve to control operation of the fluid pressure actuable valve. The invention also relates to a fuel injector for use in such a fuel system, the fuel injector comprising the injection nozzle, the fluid pressure actuable valve and the control valve.

Abstract: A fuel system for use with viscous fuels comprising a housing defining a supply passage through which fuel can flow, in use, from a source of viscous fuel towards a fuel pump, and a throttle member located within the housing and arranged to control the rate of fuel flow along the supply passage. The throttle member is angularly adjustable within the housing to adjust the permitted fuel flow rate between the source and the pump.

Abstract: An injector is described which comprises a valve element engageable with a seating, the valve element being resiliently biased into engagement with the seating. The valve element includes a thrust surface arranged, in use, to have high pressure fuel applied thereto to lift the valve element from the seating. A stop in the form of a second valve member is arranged to restrict movement of the valve element away from the seating, the second valve member being arranged to have high pressure fluid applied thereto and being movable under the influence of the valve element against the action of the high pressure fluid, in use.

Abstract: A fuel pumping apparatus includes a plunger which passes centrally through an annular member and is movable axially relative to the member. The plunger is connected to the member so that angular movement of the member will impart angular movement to the plunger by means of a dog which passes within a slot formed in the member. The plunger is loaded outwardly by means of a strong spring and during assembly of the device it is necessary to compress the spring and align the dog with the slot continuing the compression of the spring when such alignment is obtained. This task is not easy but is facilitated by relieving one end surface of the member adjacent one side of the slot over an area such that alignment of the dog with the surface is compartively easy. During compression of the spring and movement of the plunger the dog will engage with said surface.