| 摘要 |
<P>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. <P>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. <P>COPYRIGHT: (C)2013,JPO&INPIT |
