| 摘要 |
Directional-control valve (1) intended to connect a first pipe known as a "main" pipe and a second pipe known as a "secondary" pipe and comprising: an upstream port (3) and a downstream port (4) which are connected to the main pipe and have identical diameters; a third connection port (5) connected to the secondary pipe, a shut-off member (7) capable of moving at right angles to the main pipe, between two positions, namely: a closed position, in which the shut-off member (7) has a first orifice (15), of a diameter identical to that of the upstream port (3) and downstream port (4), positioned in line with said upstream port (3) and downstream port (4), a second position known as the open position, in which the shut-off member (7) has a second orifice (16) opening, on the one hand, toward the upstream port (3) and, on the other hand, toward the third connection port (3), so as to place the upstream port and the secondary pipe in communication, wherein the diameter of the upstream port (3) and the downstream port (4) is chosen to allow a scraper (20) to pass, and the second orifice (16) of the shut-off member (7) has means (23) for preventing the scraper (20), coming from the upstream port (3), from entering the second orifice (16).
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