A gas-generating apparatus includes a reaction chamber having a first
reactant, a reservoir having an optional second reactant, and a
self-regulated flow control device. The self-regulated flow control
device stops the flow of reactant from the reservoir to the reaction
chamber when the pressure of the reaction chamber reaches a predetermined
level. Methods of operating the gas-generated apparatus and the
self-regulated flow control device, including the cycling of a shut-off
valve of the gas-generated apparatus and the cycling of the
self-regulated flow control device are also described.