Abstract: Transfer pump for high-pressure petrol injection of the type including a piston (1) which delivers oil into a deformable element such as a bellows (8), the deformations of the bellows (8) in a cylindrical chamber (6) filled with fuel causing a pumping effect whereby the fuel is pumped towards a rail (40) supplying high-pressure injectors, wherein elements are arranged for diverting some or all of the oil pumped by the piston (1) towards a chamber (15) without pressuring it so as to determine at will the useful stroke of the piston (1) and hence the quantity of fuel pumped at high pressure towards the rail (40).

Abstract: Transfer pump for high-pressure petrol injection of the type comprising a piston (1) which delivers oil into a deformable element such as a bellows (8), the deformations of said bellows (8) in a cylindrical chamber (6) filled with fuel causing a pumping effect whereby said fuel is pumped towards a rail (40) supplying high-pressure injectors, wherein means are arranged for diverting some or all of the oil pumped by the piston (1) towards a chamber (15) without pressuring it so as to determine at will the useful stroke of said piston (1) and hence the quantity of fuel pumped at high pressure towards the rail (40).

Abstract: The invention relates to a device for supplying fuel under high pressure in which the fuel is put under high pressure by a transfer pump, characterized by the fact that it comprises two identical transfer pumps (3, 4), powered by a control means, controlling the fuel feed rate of the two pumps, the latter supplying the same common rail (2).

Abstract: The invention concerns a safety device for preventing overpressure occurring in the oil part (3) of a transfer pump supplying a fuel such as high-pressure gasoline to an engine characterized in that it consists of a rotary sealing joint (10) separating the oil part (3) of the pump and the oil part (7) of said engine.

Abstract: The invention concerns a method for controlling high pressure fuel supply of a set of injectors connected to a common high pressure chamber, called common rail C in a direct injection fuel circuit, through a high pressure pump (P), by acting on the low pressure supply of said pump (P) through an electromagnetic slide valve (E), controlled by the computer managing the operating conditions of the engine which consists in providing, inside the electromagnetic valve (E) one or more internal leakage flows, either from high pressure to low pressure, or from low pressure upstream of the electromagnetic valve (E) to the low pressure downstream thereby solving the specific problems related to the three operating modes of the engine: engine brake, engine shutdown, idle speed.

Abstract: The invention concerns a method for controlling high pressure fuel supply of a set of injectors connected to a common high pressure chamber, called common rail C in a direct injection fuel circuit, through a high pressure pump (P), by acting on the low pressure supply of said pump (P) through an electromagnetic slide valve (E), controlled by the computer managing the operating conditions of the engine which consists in providing, inside the electromagnetic valve (E) one or more internal leakage flows, either from high pressure to low pressure, or from low pressure upstream of the electromagnetic valve (E) to the low pressure downstream thereby solving the specific problems related to the three operating modes of the engine: engine brake, engine shutdown, idle speed.

Abstract: An electrovalve installation of the type comprising an electrovalve and a device for fastening said electrovalve to a support, such as a hydraulic block. The installation includes a collar (2) for detachably mounting the electrovalve (1) on the support (3).

Abstract: The invention relates to a bleed valve for a hydraulic circuit, comprising a piston capable of sliding in a bore formed in a body and actuating a shutter arranged between two sub-circuits and movable between a first position, in which it allows communication between the two sub-circuits, and a second position, in which it prevents this communication, the shutter being movable under the effect of an external mechanical action exerted by an actuating member. According to the invention, the sealing between the bore and the outside of the body is ensured by the actuating member, and the shutter is movable under the effect of a difference between the pressures which are exerted on its two faces.