| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of changing the water flow passage of a high-pressure washing vehicle capable of preventing water from being supplied into a tank in such a state that overflow is not allowed. SOLUTION: This high-pressure washing vehicle 1 comprises the tank 11, a water supply pipe 75 connected to the tank 11, an introduction pipe 77 having an introduction port 87 for introducing a washing water, an overflow pipe 76 connected to the tank 11, and a discharge pipe 78 having a discharge port 88 for discharging the washing water. Further, the high-pressure washing vehicle 1 comprises a four-way valve 79 releasing the state of the communication between the water supply pipe 75 and the introduction pipe 77 and the state of the communication between the overflow pipe 76 and the discharge pipe 78, and switched between a first state in which the water supply pipe 75 communicates with the overflow pipe 76 and a second state in which the water supply pipe 75 communicates with the introduction pipe 77 and the overflow pipe 76 communicates with the discharge pipe 78. COPYRIGHT: (C)2008,JPO&INPIT
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