Abstract: A fuel injection pumping apparatus of the rotary distributor type includes a pumping plunger (13) housed in a bore which is completely filled with fuel during the filling stroke of the apparatus. An electromagnetically operable spill valve (22) is provided to control the quantity of fuel supplied by the apparatus during the delivery stroke of the plunger. The spill valve is spring biased to the open position and is closed by an actuating member (42). If the spill valve sticks in the closed position the maximum amount of fuel will be supplied to the associated engine at each delivery stroke. A flow inhibit valve (35) is provided to control fuel flow to the bore. The flow inhibit valve is responsive to the position of the actuating member of the valve and will move to the closed position in the event that the spill valve remains in the closed position.

Abstract: A vane pump has a plurality of outwardly spring loaded vanes mounted within slots respectively formed in a rotor. The internal surface of the stator of the pump is of cylindrical form, and end plates at the opposite ends of the rotor and stator have inlet and outlet ports formed therein. Each vane is provided with a transfer port which communicates with the inner end of the associated slot and the transfer port is positioned to register with the inlet and outlet ports so that the movement of the vanes within the slots contributes to the pumping action.

Abstract: A hydraulic device includes a piston slidable within a cylinder. Fluid under pressure is admitted to one end of the cylinder through an inlet which contains a restrictor. The piston is formed with an orifice and is biased by a first spring towards the one end of the cylinder. A thrust rod is engageable by the piston to transmit the movement of the piston to an external mechanism. When the piston is moved by rising fluid pressure the orifice is closed by the end of the thrust rod so that a higher value of fluid pressure is required to effect the initial movement of the piston than is required to allow the return movement of the piston.

Abstract: A fuel pumping apparatus includes a high pressure pump and a low pressure pump contained in a housing and driven by a drive shaft which is coupled to a rotary part of an internal combustion engine. The low pressure pump is a vane pump having a rotor in which is formed a plurality of outwardly extending slots which accommodate outwardly spring loaded vanes. The edges of the vanes engage an eccentrically disposed surface formed on a stator. The pump has end plates and inlet and outlet ports communicating with the space defined between said surface and the outer surface of the rotor. The outer edges of each vane are formed with grooves which extend along the edges and the grooves communicate by way of passages with the inner ends of the respective slots.