Fuel injection nozzles

A fuel injection nozzle for supplying fuel to an internal combustion engine comprising a body defining a chamber, a fuel inlet to said chamber, an outwardly opening valve member extending within said chamber, a head carried by the valve member for co-operation with a seating, resilient means located in the chamber and acting to urge the valve head into contact with the seating the arrangement being such that when fuel under pressure is supplied to said chamber, the pressure acting upon said valve member lifts the head from the seating to allow flow of fuel from said chamber in the form of a spray, a tubular member slidable in the body and located about said valve member, said tubular member being axially movable relative to the valve member, means for limiting the extent of movement of the tubular member as the valve member is moved against the action of the resilient means, said tubular member defining the seating whereby when movement of the tubular member is halted the head is lifted from the seating to allow substantially unrestricted flow of fuel, said tubular member defining orifices which are uncovered to the exterior of the body during the initial movement of the valve member and tubular member against the action of the resilient means.