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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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