JPS6462714A - Control valve for city water - Google Patents

Abstract

PURPOSE:To keep the flow rate constant even when hydrostatic pressure of a water supply source is varied, by providing a base body provided with a horizontal hole for passing through a cylindrical part and a small hole for passing through a bottom wall part, and a quantity adjusting piece which is fitted freely movably into an inner hole of the base body. CONSTITUTION:On a base body 5, an inner hole 7 which extends into a drum part 3 from a flange 4 side, and also, into which a quantity adjusting piece 6 is fitted freely movably is recessed and provided, and a cylindrical part 9 and a bottom wall part 10 are formed, a horizontal hole 11 for passing through the cylindrical part 9 and a small hole 12 which passes through the bottom wall part 10, and also, whose diameter is smaller than that of the horizontal hole 11 are provided, and a cone part 13 is provided on the bottom wall part 10. Accordingly, as hydrostatic pressure of a water supply source rises, force in the reverse direction, applied to the quantity adjusting piece 6, namely, force applied to the end face of the lower part increases, the quantity adjusting piece 6 moves in the direction of the horizontal hole 11, and by blocking the horizontal hole 11 in accordance with its moving extent, the discharge quantity from the horizontal hole 11 is suppressed. On the other hand, as for the small hole 12, the discharge quantity increases by being roughly in proportion to an increase of pressure of the inner hole 7. In such a way, even when hydrostatic pressure of the water supply source is fluctuated, a roughly equal water quantity can be discharged from the base body 5.