NOVELTY - A pressure-regulating valve comprises a movable pressure-responsive member disposed in a housing (61), and is responsive to an inlet pressure and an outlet pressure. The pressure-regulating valve is connected to a gas-generating apparatus by a connection valve (27). The connection valve comprises two valve components (60, 62), each having internal seal. The valve components form an inter-component seal before the internal seal is opened.    USE - As a pressure-regulating valve for connecting a fuel supply to a gas generating apparatus such as fuel cell e.g. alkali fuel cells, polymer electrolyte fuel cells, phosphoric acid fuel cells, molten carbonate fuel cells, solid oxide fuel cells and enzyme fuel cells useful in mobile or cell phones, notebook computers, and personal digital assistants (PDAs).    ADVANTAGE - The pressure regulating valve provides automatic and dynamic control of gas generation. The pressure regulators and flow orifices regulate the hydrogen pressure and minimize the fluctuation in pressure of the hydrogen received by the fuel cell. Thus, the hydrogen gas generator apparatus is capable of self-regulating the flow of at least one reactant into the reaction chamber and other devices to regulate the flow of fuel.    DETAILED DESCRIPTION - A pressure-regulating valve comprises a movable pressure-responsive member disposed in a housing (61), and is responsive to an inlet pressure and an outlet pressure. The pressure-regulating valve is fluidically connected to a gas-generating apparatus by a connection valve (27). The movable pressure-responsive member is also exposed to a reference pressure; and comprises a diaphragm, slidable piston, or opposing biased pistons. The outlet pressure is the pressure in a fuel cell. The inlet pressure is the pressure of a reaction chamber within the gas generating apparatus. The movable pressure-responsive member is connected to a sealing member. The sealing member is adjustable to vary the pressure that seals the pressure-regulating valve. The connection valve comprises two valve components, each having an internal seal. The valve components form an inter-component seal before at least one of the internal seal is opened. The inter-component seal is formed between a rod extending from one valve component and a sealing member from the other valve component. The sealing member comprises an O-ring. The pressure-regulating valve further comprises a flow restrictor in fluid communication with an outlet of the pressure-regulating valve. The flow restrictor comprises an orifice. The orifice comprises a duckbill valve.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of a shut-off valve for use in the gas-generating apparatus.    Connection valve (27)    First valve component (60)    Housing (61)    Second valve component (62)    Sealing surface (67)    Flow path. (79, 80)