A device for the control of the delivery of the gas in self-propulsion gas systems, in methane gas systems in particular. The system includes a gas cylinder under high pressure, a pipeline which conveys the gas from the cylinder to the engine and devices for controlling the flow and pressure of the gas...http://www.google.de/patents/US6142128?utm_source=gb-gplus-sharePatent US6142128 - Means for controlling the delivery of gas in self-propulsion gas systems
