| 摘要 |
A freeze resisting valve apparatus, for controlling water flow, the combination comprising: a vertically elongated, hollow valve body having a lower portion adapted for installation underground, the body having a lower water inlet associated with the lower portion, and an upper water outlet, for passing a stream of pressurized water through the body; a water reservoir adapted for installation underground and having communication with the body lower portion via an ejector port; a valve seat projecting in the lower portion of the body and having a narrowed passage extending upwardly and positioned to increase pressurized water flow velocity in proximity to the port, the ejector port being proximate the level of the seat; a valve member tapering downwardly toward an apex always remaining in alignment with the narrowed passage as the stopper member moves toward and away from the seat to effect drainage of water in the valve body downwardly, in the body past the stopper to the reservoir when the stopper is closed on the seat with the apex at the narrow passage, and to effect inducing of water flow from the reservoir through the ejector port and into the stream and then upwardly in the body when the stopper is retracted upwardly from the seat; the reservoir being substantially coaxial with the stopper valve member and seat; and there being a shaft connected with the stopper and extending upwardly in the body, the body having a reduced diameter eductor bore in which the shaft extends with annular clearance to form an eductor passage through which water flows to and from the stopper.
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