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Less pressure with solenoid than bleed screw

Posted by ianjohnson SoCal (My Page) on
Sun, Jul 3, 11 at 15:41

I have some zones that are losing pressure. I find that when the timer opens them, the sprinklers will not pop all the way, but they will if I open the bleed screw.

I've found a couple sections of wire where the insulation has been stripped and there is some exposed wire that is corroded. Can this cause a reduction in the voltage getting to the solenoid? Can reduced power to the solenoid cause a reduction in pressure, or is a valve fully open or fully closed with nothing between?

I've solved this problem before by simply replacing the valve, but this is a good brass one, and I would rather try to fix the actual problem if possible.

Follow-Up Postings:

RE: Less pressure with solenoid than bleed screw

The first thing I would do is repair the wires then check if the valve has a flow control knob. If it does then make sure it is open all the way. If that does not fix the problem the solinoid needs to be replaced.

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