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Starting Member

Posts: 1

Location: USA


Monday, June 7th 2004, 10:03am

Pressure varies in 1 zone

Am working on a friend's system, about 30 years old. Got all (4) zones to work, and all heads to operate properly, but have 1 zone (only) where the pressure fluctuates, to the point where some of the heads retract again, then rise as the pressure rises. Happens intermittantly, and no puddles. Took (manual) valve apart, no clogs. Took all heads off in this zone to let run out any foreign matter, no change.

Any suggestions appreciated.

Thanks in advence


Advanced Member

Posts: 229

Location: USA


Monday, June 7th 2004, 11:30am

Its poosibly you have a kink in a line. Tree roots can do some nice jobs over many years or it could just be a bad valve.

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