AN unloader looks at the hose pressure and uses that to push on a spool valve with the spool valve dumping line pressure to the reservoir. when the hose pressure drops, a spring pushes that spool (and the line pressure closed) to block the return to tank. The pressure regulator is usually totally separate. Hose pressure when spraying is controlled by nozzle orifice flow rate. If a nozzle gets worn, the unloader might not operate as designed. They can also be affected by trash or particles in the fluid stream. Many are adjustable to account for inlet and hose/nozzle differences. Jim
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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