| 摘要 |
<p>A gas supply at constant pressure is required for the motor (27) throughout periods of varying demand. The demand on the stored, liquefied, gas is met by first feeding the gas above the liquid and supplementing with liquid. Liquid is gasified in a heat exchanger (21) before being fed to the motor. An increased pressure in the supply line causes an increase in pressure in a chamber forcing down a spring-loaded piston whose underside is relieved to atmosphere through bellows. This opens a pipeline to the storage tank where the high pressure will keep the piston depressed to feed gas directly through a gas connection. A rapid pressure drop in the tank, and an associated lowering of back pressure closes the end of pipeline as the piston rises. As the back pressure drops further, a spring raises the piston and pipeline so that a plate is lifted off its seat allowing liquid to flow from a liquid connection into the delivery line. This also prevents an undue pressure rise in the storage tank with subsequent loss of gas through the safety valve.</p> |
