Control device for center pivot irrigation units

Fluid handling – With casing – support – protector or static constructional... – Vehicle

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239177, 91 36, 91 39, 91171, B05B 300

Patent

active

042482607

ABSTRACT:
A control device is designed for center pivot irrigation units of the type having an elongate water carrying pipe with a plurality of support vehicles spaced therealong, and wherein each of the vehicles includes a double acting hydraulic cylinder mounted thereon for moving the vehicle and the water pipe over the ground. The irrigation unit includes a device for aligning the vehicles, a hydraulic pump with pressure and return lines, and power and retract manifolds respectively interconnecting power and retract sides of the cylinders. The control device includes a hydraulic valve with three positions which communicate the pressure line with the power manifold, the retract manifold, and the pump return line respectively. A timer is operably connected with the valve and regularly sequences the same through a repeating cycle, whereby between the application of pressurized hydraulic fluid to each of the cylinder sides, the control device places the system in a neutral position, in which the hydraulic fluid flows substantially unrestricted through the system for reduced energy consumption, lower fluid temperature, and an extended operating life.

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