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I don't know everything...Wilkins 420

Discussion in 'Irrigation' started by SprinklerGuy, Jul 26, 2007.

  1. SprinklerGuy

    SprinklerGuy LawnSite Bronze Member
    Messages: 1,778

    Went to a client's rental home yesterday....her 420 Freezeproof LOL PVB was leaking...I had a repair kit and proceeded to replace parts....

    First the check valve....still leaks...then the white retainer ring doohickie...still leaks...then the poppet...leaked a little....then th e bonnet and oring...stopped leaking.....except when a zone came on...then it leaked as if it were lower than the heads..like an ASV would....wtf?

    Anybody familiar with this PVB...?

    It was almost 8PM and I had had enough of the day...so I passed until later today,.....lil help Please? What could cause this..what am I missing on this PVB I have only seen once...

  2. irritation

    irritation LawnSite Gold Member
    Messages: 3,544

    I know Wilkins had a recall on them a few years ago.
    I've found that leaving both ball valves half open usually keeps them from dumping and doesn't affect the pressure.
  3. DanaMac

    DanaMac LawnSite Fanatic
    Messages: 13,184

    Haven't had that problem yet. But I have only worked on a few. Are the zones stretched and exceeding GPM, causing it to leak/dump? Slap in a 765 and be done with it :)
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,246

    Even the older Wilkins 720 will dump at low pressures. Different sort of poppet arrangement.
  5. SprinklerGuy

    SprinklerGuy LawnSite Bronze Member
    Messages: 1,778

    Washer was missing on the plastic retaining doohickie thingamabobber....
  6. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 23,090

    What..you guys don't have a spread sheet for "washer inspections?"
  7. SprinklerGuy

    SprinklerGuy LawnSite Bronze Member
    Messages: 1,778

    I couldn't retrieve it today..blackberry service was down in that area
  8. PurpHaze

    PurpHaze LawnSite Fanatic
    Messages: 5,496

    Damn those retaining doohickie thingamabobbers... first a space shuttle... now a backflow device... what next???

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