| 摘要 |
PROBLEM TO BE SOLVED: To provide a nozzle for removing scales that enables injection in accordance with the width of a rolled steel sheet. SOLUTION: A piston valve 6 which is freely movable slidingly in the injection direction of a fluid is provided in a cylinder 11 and a nozzle adaptor 12 provided in a valve for 5; a valve opening/closing part 7 is provided between the cylinder 11 and the piston valve 6, and is energized in the direction against the fluid pressure, and is maintained in a closed condition in a specific fluid pressure; an energizing mechanism 9 which allows the release of the valve opening/closing part 7 when a fluid pressure is actuated higher than the specific pressure is provided; and a hole 45 penetrating from the outer part of the cylinder 11 into the pressing mechanism chamber 17 is provided. Consequently, when a mechanism 46 for opening/closing a vent opening fitted to the vent opening 34 provided in the valve box 5 is kept closed state even when a fluid pressure higher than a specific pressure is actuated by the internal pressure of the energizing mechanism 9 and the energizing mechanism chamber 17; the valve opening/ closing part 7 is kept closed state and, by such a structure, injection is made possible in accordance with the width of a rolled steel sheet. |
