Pressure reduction valve, to deliver a fluid at a working pressure for a fuel cell from a pressurized container, has two or more reduction stages with downstream pressure controls

摘要

The pressure reduction valve (1), to give a fluid delivery from a pressurized container (39) and at a lower working pressure, has a primary inflow (3,8) for the high pressure flow from the container and an outlet (51) for the lower pressure delivery. The valve has two or more pressure reduction stages (10,46). At least one stage has a downstream pressure control mechanism (12,21-23,44,66-68). At least one reduction stage is within the container when the valve is attached to it, with its valve body (12,44) relieved of pressure.