| 摘要 |
The valve is integrated into a fluid distribution network and makes it possible, in a selective manner, to interrupt or authorize the flow of a fluid in an axial direction of a pipe. This valve comprises an external body (20), inside which a shut-off member (22) is disposed, a service seal (220) which, in a shut-off position of the valve, provides sealing between the shut-off member and the body (20) of the valve, and a maintenance sealing mechanism (M) which is disposed upstream of the service seal (220) and which provides sealing during maintenance operations on the service seal (220). The mechanism (M) comprises a ring (206) which is able to move axially, with respect to the body (20) of the valve, between a retracted position, in which it does not prevent the passage of the fluid, and a forward position, where it bears in a sealing manner against the shut-off member (22). The ring carries, on its internal surface, an elastically deformable membrane which, when the ring is in the forward position, bears, at least partially, against the shut-off member (22). |
