Importance

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Abstract

A directional-control valve is connectable to a first main pipe and to a secondary pipe. The valve includes an upstream port and a downstream port connectable to the first main pipe and having identical diameters. A third connection port is connectable to the secondary pipe. A shut-off member is capable of moving at right angles to the main pipe between a closed position and a second open position. In the closed position, the shut-off member includes a first orifice, of a diameter identical to that of the upstream port and downstream port, positioned in line with the upstream port and the downstream port. In the second open position, the shut-off member includes a second orifice opening toward the upstream port and toward the third connection port, so as to place the upstream port and the secondary pipe in communication, and wherein the diameter of the upstream port and the downstream port is sized to allow a scraper to pass, and the second orifice of the shut-off member includes means for preventing the scraper, coming from the upstream port, from entering the second orifice.

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First Claim