| 摘要 |
<p>A system for safe vapor recovery, particularly for fuel filling installations, in which a positive displacement pump effects controlled drawing of a vapor-air mixture into a vapor return pipe which extends to the bottom of the underground tank of the installation. The system is provided with a non-return valve downstream of the pump and a special circuit for effecting the controlled in-drawing based on the quantity of fuel delivered, the difference in temperature between the underground tank and the recovered mixture, and especially on the density of the mixture, by which its degree of explosiveness is determined. Structure are also provided for preventing or limiting explosion propagation.</p> |
