| 摘要 |
<p>The present invention relates to a pressure relief device for a silo comprising a body portion (20) defining an aperture closable by a hinged lid (10), the lid comprising a counterbalance (40), wherein a centre of gravity of the counterbalance (40), is aligned vertically with the pivot when the lid is in the closed position, such that the counterbalance (40) applies no or a negligible torque about the pivot when the lid is in a closed position.</p> |
