| 摘要 |
<p>Inflatable diaphragm valve comprising an inner diaphragm (11) forming a seal and an outer diaphragm (13) surrounding the inner diaphragm and enable to move outwardly under inflation. Inflation, possibly associated with a lifting motion, pulls the inner diaphragm (11) in a rolling or folding manner thereby catching any material which may adhere downstream of the inner membrane (11) and then become detached therefrom. Application particularily to pipes carrying concrete.</p> |
