GAS PRESSURE REGULATOR FOR REGULATING THE PRESSURE OF A GASEOUS FUEL, SYSTEM FOR SUPPLYING AN INTERNAL COMBUSTION ENGINE WITH GASEOUS FUEL BY USING SUCH A GAS PRESSURE REGULATOR, AND METHOD FOR OPERATING SAID SYSTEM

摘要

The invention relates to a gas pressure regulator (1) for regulating the pressure of a gaseous fuel, having a housing (2) in which a longitudinally movable gas piston (3) is arranged, which delimits a gas chamber (5) and a pressure chamber (7) that can be filled with a working liquid, wherein the gas piston (3) has a first seal (24) running around the outside of the gas piston, by means of which seal the gas piston (3) is guided in a sealing manner in the housing (2) and which seals off the gas chamber (5). As a result of the interaction of the gas piston (3) with a valve seat (21), a control valve (20) is formed, via which gas can be led out of the gas chamber (5). Formed on the outside of the gas piston (3) is a second circumferential seal (25), by means of which the gas piston (3) is likewise guided in a sealing manner in the housing (2), wherein the gas piston (3) is at least partly surrounded by a low-pressure gas chamber (9) and the second seal (25) separates the low-pressure gas chamber (9) from a gas return chamber (10), wherein the gas chamber (5) can be connected to the gas return chamber (10) via the control valve (20). The invention further relates to a system for supplying an internal combustion engine with gaseous fuel, which system has an intermediate tank (200) and such a gas pressure regulator (1). In a method for operating said system, there is also a return reservoir (300), the pressure of which is set between the pressure in the gas chamber (5) and in the gas tank (100).