| 摘要 |
THE PRESENT INVENTION RELATES TO A DEVICE WHICH IS USED IN THE FLOATING ROOFS OF TANKS FOR STORING LIQUIDS AND IS INTENDED TO PREVENT THE FORMATION OF A VACUUM BETWEEN THE STORED LIQUID AND THE FLOATING ROOF (5). MORE PARTICULARLY, THE DEVICE OF THE INVENTION IS INTENDED FOR A LIQUID STORAGE TANK WHICH HAS OPERATING HEIGHTS WHICH ARE MUCH LOWER THAN THE MAINTENANCE HEIGHT.THERE ARE TWO POSSIBLE WAYS IN WHICH THE DEVICE OF THE INVENTION CAN OPERATE. WHEN THE FLOATING ROOF (5) IS IN OPERATING MODE AND REACHES ITS MINIMUM OPERATING HEIGHT (FIGURE 2), A LOWER SHAFT STOP (10) OF A SLIDING SHAFT OF THE VALVE COMES AGAINST A LOWER STOP (8) OF THE BODY (2) OF THE DEVICE, CAUSING THE DEVICE (30) TO OPEN.WHEN THE FLOATING ROOF (5) IS PLACED IN THE MAINTENANCE MODE, USE IS MADE OF A LOCKING PIN (4) FOR RIGIDLY FASTENING THE SLIDING SHAFT (3) TO THE BODY (2) OF THE DEVICE (30), WHICH ENABLES THE ASSEMBLY TO OPEN WHEN THE FLOATING ROOF REACHES THE MAINTENANCE HEIGHT.(FIG. 4)
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