| 摘要 |
<p>The invention concerns a closure element for regulating the flow of a fluid in a hydraulic installation (1), consisting of an immersed spherical ball (4), comprising an outer elastomeric shell (10) coating a hard and solid pressure resistant core (11) and designed to close or clear, directly or indirectly, an opening of the installation. The invention is characterized in that the core (11) of the spherical ball (4) is made from an aggregate of organic or mineral granules and a binder, of predetermined density based on the choice of components, for direct or indirect floating or gravitational closure.</p> |
