PROBLEM TO BE SOLVED: To provide a nozzle holder capable of preventing repeated spraying by spray nozzles overlapping with each other, securing opening and closing a chemical supply passage for supplying the chemical to the spray nozzles, and capable of preventing dropping of the chemical at starting of spraying and dripping of the chemical at termination of spraying, and to provide a boom sprayer having the nozzle holder.SOLUTION: The nozzle holder includes: an opening and closing control unit 10 which closes a chemical flow passage 7 by adhering a valve 9 for opening and closing to a valve seat 8 when reduced pressure in the chemical flow passage 7 is below a predetermined pressure, and opening the chemical flow passage 7 by separating the valve 9 for opening and closing from the valve seat 8 when the reduced pressure is over the predetermined pressure and a forcedly-closing unit 11 for a flow passage, fixing the opening and closing control unit 10 for controlling one spray nozzle 4 among overlapping spray nozzles 4 in a closed state and adhering the valve 9 for opening and closing to the valve seat 8 regardless of the reduced pressure of the chemical.COPYRIGHT: (C)2013,JPO&INPIT【課題】 重なり合う散布ノズル同士による重複散布を防止し、散布ノズルへ供給する薬液供給路の開閉を確実にするとともに、散布開始時における薬液のボタ落ちや散布終了時における薬液の液だれを防止することができるノズルホルダおよびこのノズルホルダを備えたブームスプレーヤを提供する。【解決手段】 薬液流通路7内の液圧が所定の圧力以下である場合に開閉用弁9を弁座8に密着させて薬液流通路7を閉鎖するとともに、液圧が所定の圧力以上になった場合に開閉用弁9を弁座8から離間させて薬液流通路7を開放する開閉制御手段10と、重なり合う散布ノズル4のうち、一方の散布ノズル4を制御する開閉制御手段10を閉鎖状態に固定して開閉用弁9を薬液の液圧にかかわらず弁座8に密着させる流通路強制閉鎖手段11とを有する。【選択図】 図4
