Irritrol - Richdel 217B not fully opening
Hello all,
I have made a setup with 11 Irritrol / Richdel 217B - 2"valves. They are used to switch on / of the drip lines. I have a problem the valves are not opening fully every time..lets say they work o.k. for 50%. It are used valves. When I use the manual bleed screw the valve will fully open, and stay open untill the valve is switched of. I've cleaned everything out and can find any cracks/dirt in the valves. I'm using a low flow in the valves (22GPM, 45PSI). The controller works o.k., as are the sollenoids. The way the controller works is as follow: the valve is opened and a second later the pump is powered. The pressure is build up in the system in about 7 seconds to 45PSI, but the valves often don't fully open.
any input would be appriciated!
regards,
Adryan