| 摘要 |
A hydroelectric switch for a pump comprising in a first embodiment an elongated body defining fluid inlet and fluid outlet orifices, a substantially elongated seat through which fluid flows, a disk having a tapered flange and a rod extending centrally therefrom, the disk peripherally seating within the elongated seat, a conduit by-passing the disk, a spring-biased piston slidable within a cylinder built-in the body on the same axis as the rod, the piston slidable upon the rod when the spring expands, a conduit feeding the cylinder with fluid from the outlet orifice, an electrical switch attached to the body on the same axis as the rod and operable by the movement of the rod. In a second embodiment, a valve member is axially movable in an elongated body defining fluid inlet and fluid outlet orifices, the valve member as a disk in combination with a rod extending therefrom, the disk is sealably engagable with an inner bore of the elongated body and biased away from a sealing engagement with said body by a spring. Under a build-up of water pressure, the valve member is biased to the right against the pressure of the spring with the rod end contacting an electrical switch attached to the body on the same axis as the rod opening contacts therein. An enlarged compartment is provided with an air injection pump supplying a charge of air to the compartment each time the pump begins operation so as to maintain an air cushion for forcing water out of the compartment when desired.
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