| 摘要 |
<p>The device has a metal safety frame (15) embedded in a concrete small island (6) and below a liquefied petroleum gas (LPG) distributor apparatus. The safety frame is crossed by LPG transfer and return lines (12, 13). The transfer lines transfer the gas in liquid phase, and the return lines return the gas in vapor phase. The frame has a protection unit composed of two breakable connections (21). The connections have valve elements that are automatically offset and moved to a locking position for blocking the lines, in the presence of impact or shear stress on the distributor apparatus.</p> |
