JPS571917A - Water works meter with sub-pipe - Google Patents

Abstract

PURPOSE:To actuate a selector valve speedily and reliably to perform an accurate flow quantity measurement, by providing a movable inner pipe in a by-pass outer pipe which communicates with a sub-pipe and whose end is opened toward the water-receiving part of the selector valve body, and providing an auxiliary pipe which communicates with the by-pass outer pipe. CONSTITUTION:When the supply from the city water is of small quantity, water passes through a master meter and flows into a selector valve 24 from an inlet 30a as well as passes through a sub-meter via a sub-pipe and flows out from a by-pass outer pipe 52 through a movable inner pipe 56, but does not flow into an auxiliary pipe 54. Under said condition, a valve body 42 is at rest, so that the master meter is not rotated. When the quantity of flow increases, the water pressure pushes up the valve body 42, so that the master meter is rotated to measure the quantity of flow. In this case, the movable inner pipe 56 is also pushed up. Thereby, the opening at the end of the by-pass outer pipe 52 is closed up. Accordingly, the water from the sub-meter is restrained from flowing in, and the water from a communicating hole 56b jets out through the auxiliary pipe 54 to push up the valve body 42.