| 摘要 |
PURPOSE:To increase a volume range of applicable water and improve workability by providing a main valve seat for separating a surplus water port from a primary chamber and a sub valve seat formed by a piston and communicating the primary chamber with a secondary chamber. CONSTITUTION:When a pump and the like communicating with an inlet 21 is driven, liquid passes through a primary chamber 31 and a communicating aperture of a piston 33 so as to push a sub valve plug 52 upwardly and flows to a nozzle through an outlet 22. At the time, a portion of the liquid flowing through the primary chamber 31 flows to a surplus water port 26 passing through a portion of a main valve seat 25. Since the pressure of the primary chamber 31 is higher than that of a secondary chamber 32 by the amount of pressure drop, the piston 33 is lifted. When the nozzle is shifted to a closed state, the pressure of the secondary chamber 33 increases abruptly so that the sub valve plug 52 abuts a sub valve seat 51 and the piston 33 lowers, whereby a boss portion 34 of the piston 33 abuts a main valve seat member 25a.
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