| 摘要 |
<p>This tap, with spherical turning part (5) on a shaft, comprises at least on the "upstream" side a seat (14) which is movable in the direction of flow of the fluid (F). The seat (14) is linked to the body (1) of the tap by an annular membrane (21), constituting one wall of an annular chamber (22) relatively isolated from the "upstream" conditions, for example by a calibrated hole (23). Balancing means (26) are provided, with a channel (28) and a conduit (29) linking the annular chamber (22) to the central volume (27) of the tap, communication being established at the instant of opening of the tap in order thus to distance the seat (14) from the turning part (5). This establishment of communication can be brought about by the control stalk (10) of the turning part (5), during the operation of opening the tap. <IMAGE></p> |
