Filter+Regulator Before or After valve?

Discussion in 'Irrigation / Sprinkler Forum' started by flapper, Jun 16, 2016.

  1. flapper

    flapper Member

    Joined:
    May 19, 2016
    Location:
    California
    (For Drip systems) I've always seen the filter and regulator after the valve.
    It is recommended to have a filter before the valve.
    So I thought, why not put the filter + regulator unit before the valve?
     
  2. valveman

    valveman Cary Austin Staff Member

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    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    It should still work, but the regulator will only let the electric valve have 10 PSI or so, and it might not have enough pressure to keep the valve closed.
     
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  4. flapper

    flapper Member

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    The regulator regulates to 30 PSI. Should be enough.
    So it's just down to whether the filter + regulator is designed for constant pressure or not.
     
  5. valveman

    valveman Cary Austin Staff Member

    Joined:
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    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    The regulator is what maintains the pressure at a constant 30. With the regulator last in line you will have 30 PSI to the drip. If you put the filter and/or the valve after the regulator, the friction loss from these items will decrease the 30 PSI from the regulator to the drip.
     
  6. flapper

    flapper Member

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    May 19, 2016
    Location:
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    How much pressure would it drop?
     
  7. valveman

    valveman Cary Austin Staff Member

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    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    Depends on the friction loss of the particular valve and filter, and how dirty the filter is.
     
  8. flapper

    flapper Member

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    May 19, 2016
    Location:
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    Just about how much; could it be 10 PSI or is it probably just going to be 1-5 PSI?
     
  9. winni cheng

    winni cheng New Member

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    Jun 11, 2016
    Location:
    Hong Kong, China
    10psi is workable for some pressure regulators!but 1-5 psi is too low..some times can not open the irrigation valve...
     
  10. flapper

    flapper Member

    Joined:
    May 19, 2016
    Location:
    California
    pressure drop
    not actual pressure
     
  11. winni cheng

    winni cheng New Member

    Joined:
    Jun 11, 2016
    Location:
    Hong Kong, China
    ok.it depends on the pressure regulator. Such as our regulator range is 11 psi~95 psi
     
  12. valveman

    valveman Cary Austin Staff Member

    Joined:
    Mar 15, 2006
    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    Probably about 5 psi, give or take.
     

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