A gas pressure regulator for regulating the pressure of a gaseous fuel, system for supplying a gaseous fuel to an internal combustion engine using such a gas pressure regulator and method for operating this system

摘要

Gas pressure regulator (1) for controlling the pressure of a gaseous fuel, comprising a housing (2) in which a longitudinally movable gas piston (3) is arranged which delimits a gas space (5) and a pressure space (7) which can be filled with a working fluid, wherein the Gas piston (3) has a circumferential on its outer side first seal (24), with which the gas piston (3) is sealingly guided in the housing (2) and which seals the gas space (5). By the interaction of the gas piston (3) with a valve seat (21), a control valve (20) is formed, can be derived via the gas from the gas space (5). On the outside of the gas piston (3), a second circumferential seal (25) is formed, with which the gas piston (3) is also sealing in the housing (2), wherein the gas piston (3) at least partially surrounded by a low pressure gas space (9) and the second seal (25) separates the low-pressure gas space (9) from a gas return space (10), wherein the gas space (5) can be connected to the gas return space (10) via the shut-off valve (20). A system for supplying an internal combustion engine with gaseous fuel has an intermediate tank (200) and such a gas pressure regulator (1). In a method for operating this system, there is also a return accumulator (300) whose pressure is set between the pressure in the gas space (5) and in the gas tank (100).