Pressure regulators for gaseous fuels, especially hydrogen gas.

Abstract

This application relates to a pressure regulator for gaseous fuels, particularly hydrogen gas, the pressure regulator comprising: an inlet for gaseous fuel with an inlet pressure; an outlet for gaseous fuel; a main valve comprising a main valve inlet, a main valve outlet, an auxiliary main valve inlet, and a control piston in a housing that controls the fuel flow rate from the inlet through the main valve to the outlet; and an electronically controllable valve configured to deliver the inlet pressure as a control pressure to the control piston of the main valve via the auxiliary main valve inlet, thereby controlling the fuel flow rate at least on the basis of a pressure sensor signal indicating the pressure of the gaseous fuel at the outlet of the pressure regulator, wherein the main valve further comprises a passage for gaseous fuel configured to release the control pressure acting on the control piston. This application further relates to a multistage safety system for the pressure regulator described above.

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