Slowest Closing Valves

Discussion in 'Irrigation' started by RhettMan, Mar 30, 2013.

  1. RhettMan

    RhettMan LawnSite Silver Member
    from Texas
    Posts: 2,136

    Rainbird says their valves close slow, but of course they say that.
    (I do like rainbird)

    Anyway...

    Toro 260
    DV-100
    Hunter PGV

    Assuming equal and properly designed inlet pressure, laterals, heads, etc. :

    which valve really closes the slowest? (during normal electrical operation (not manually bled))
     
  2. bcg

    bcg LawnSite Bronze Member
    from Tx
    Posts: 1,835

    The PGA. In fact, it closes so slow it often doesn't.
     
  3. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,369

    I haven't seen the PGA. The old Toro two-screw-solenoid valves (series 260,250,230) could be counted to take minutes to close when you used the manual bleed to operate them.
     
  4. RhettMan

    RhettMan LawnSite Silver Member
    from Texas
    Posts: 2,136

    I've used a pga before for the reason of the advertised slow closing.
    Seriously often doesnt close? I hope not.

    I've noticed this as well. ( I wouldnt be surprised I mean. I have seen 15-20 seconds though)

    What about normal electrical cut-off closing ?
     
  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,369

    always a non-banging shut-off, but nothing like the eternity of manual bleed operation - I think they slightly altered the manual-bleed behavior in favor of speedier closing, which is good, because the originals were one valve you would never want to try to winterize by way of the bleed (valve sticks open)
     
  6. bcg

    bcg LawnSite Bronze Member
    from Tx
    Posts: 1,835

    If the pressure is not where the PGA wants it (and I'm not sure exactly where that is) for the flow it's making, it won't close. I had several 1.5" PGA's running fairly large rotor zones (35GPM or so) that I had this problem with. Rebuilt them (even though they were new), replaced a couple of them and finally put PEB's in instead. No problems with the PEB, so I only use it on larger than 1" valves now even though it's a little more expensive.
     
  7. Mikegyver

    Mikegyver LawnSite Bronze Member
    Posts: 1,810

    No kidding. I replaced the guts of a 264 this week. Takes FOREVER for it to close. It usually closes right after the rotor nearest to the manifold soaks you....
     

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