| 摘要 |
<p>The invention relates to a double-walled leaktight cover for closing any orifice, for example the run off container of a road tanker, of the type comprising an upper cap 28 and a lower cap 30 forming together a chamber containing a thermally insulated material 36 and provided with peripheral flanges 38, 40 applied onto each other. The cover furthermore comprises a removable seal 46 fixed between the flanges in order to seal both the said chamber and the said orifice, the said caps being assembled together removably so as to allow withdrawal and replacement of the seal and/or of the insulating material. <IMAGE></p> |
