Title: System for automatic forward bow alignment on water drive pivot

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Abstract: A system for automatic forward bow alignment on a water drive pivot irrigator has a valve assembly associated with each of the towers of the irrigator for regulating movement of the respective tower in a direction of rotation of the irrigator. A flexible element extends along the length of the pipe connecting together the towers of the irrigator for detecting alignment of each of the towers along a desired forward bow of the irrigator and controlling the valve assembly of each of the towers as a function of alignment and misalignment of the particular tower with respect to the desired forward bow. Each valve assembly includes a pair of valves normally held open by a weight mounted on an actuator of the valve, with a reversing lever being connected to the actuator of each of the valves for selectively closing one of the valves while assuring the other of the valves is held in an on position. The flexible cable is also connected to the valve actuators for selectively closing the one of the valve actuators which is in an on position to the closed position thereof in order to stop a tower when same is getting too far ahead of the correct forward bow, while a wind flag is advantageously also connected to the valve actuators and to the flexible element for compensating for the pressure of wind against the flexible element.


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