| 摘要 |
A flow restriction device for restricting flow through a conduit is described. The flow restriction device comprises a deformable insert having a wall section having an inner surface and an outer surface and defining a throughbore, the wall section having properties that are conducive to deformation, the deformable insert being adapted, in use, to be located in or adjacent to an insert support. The flow restriction device further comprises at least one pressure generating material portion adapted in use, to generate a deformation force in response to an activation signal, the deformation force adapted to deform the deformable insert wall section when applied to the deformation insert outer surface to reduce a throughbore cross sectional area and at least one trigger adapted to generate the/each activation signal. In use, when the flow restriction device is exposed to an internal throughbore pressure, a force generated on the deformable insert inner surface by the internal throughbore pressure is substantially resisted by the deformable insert in combination with the insert support such that deformation of the deformable insert by the internal throughbore pressure is limited. |
