Abstract: A dual-fuel supply system (100) for direct injection for engines of heavy vehicles, comprising: a supply line of a combustible liquid (160); a supply line of a combustible gas (170); a plurality of injectors (150) in fluid communication with the supply line of the combustible liquid (160) and with the supply line of the combustible gas (170); a pressure regulator device (1) for regulating the combustible gas; an electronic control unit (ECU) configured to control the supply of combustible liquid and of the combustible gas to the injectors (150), the electronic control unit (ECU) being configured to control the pressure regulator device (1) to track a reference pressure (ptarget) according to a feedback logic.

Abstract: A fluid pressure regulator includes a regulation chamber arrangement in which a piston is received, in the regulation chamber arrangement, a first chamber and a second chamber being defined by opposite parts of the piston. The first chamber and the second chamber include respectively a first inlet and a second inlet for the fluid, the first inlet and the second inlet being connected to a first environment at a first pressure. The first chamber and the second chamber include respectively a first outlet and a second outlet for the fluid, the first outlet and the second outlet being connected to a second environment at a second pressure. The piston is movable in the regulation chamber arrangement in response to a variation of pressure of the fluid in the first chamber to open/close the second outlet to regulate the second pressure. The fluid pressure regulator includes a valve device to open/close the first outlet to induce the pressure variation in the first chamber.

Abstract: A fluid pressure regulator includes a regulation chamber arrangement in which a piston is received, in the regulation chamber arrangement, a first chamber and a second chamber being defined by opposite parts of the piston. The first chamber and the second chamber include respectively a first inlet and a second inlet for the fluid, the first inlet and the second inlet being connected to a first environment at a first pressure. The first chamber and the second chamber include respectively a first outlet and a second outlet for the fluid, the first outlet and the second outlet being connected to a second environment at a second pressure. The piston is movable in the regulation chamber arrangement in response to a variation of pressure of the fluid in the first chamber to open/close the second outlet to regulate the second pressure. The fluid pressure regulator includes a valve device to open/close the first outlet to induce the pressure variation in the first chamber.