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Thread: Needle valves

  1. #1
    Join Date
    Nov 2018
    Location
    Franklin, PA
    Posts
    44

    Default Needle valves

    I'm wondering what you all use for needle valves.

    Last year in my RO setup, I bought a cheap 1/2" needle valve, but what I found was the max flow on it was too low, so even when I opened it up fully, I was still seeing 180-220 PSI...
    I'm thinking I need a better needle valve that will allow more flow through when it's wide open to allow for better flushing.. I suppose I could also add a gate/ball valve in there to open it wide up...

    btw, I'm running a 5 series procon, so max PSI is 250 and flow rate is 5 GPM. All schedule 40 PVC 1/2"

    any recommendations would be appreciated, especially if they were budget conscientious recommendations
    2019 290 taps on 3/16"
    2018 20 taps on milk jugs
    2017 10 taps on milk jugs

  2. #2
    Join Date
    Mar 2015
    Location
    Westfield, NY
    Posts
    225

    Default

    Not sure of your set-up, but could you plumb in a tee above and below the needle valve with a ball valve in between the tee's to work as a by-pass when you need full flow and not touch the needle valve at all? Just a thought.
    backyard hobbyist
    Mason 2x3 w/AUF
    2020 - added small vacuum and gravity 5/16 tubing and sap sacks
    N 42* 18' 31."
    W 79* 34' 15."
    https://www.saptapapps.com/map/31868...-aab748a6394e/

  3. #3
    Join Date
    Feb 2007
    Location
    CAPAC MICHIGAN
    Posts
    734

    Default

    2x6 RAISED FLUE PANS
    by WF MASON
    650 taps on vac.
    100 on bags

  4. #4
    Join Date
    Mar 2013
    Location
    Campbellford, on
    Posts
    667

    Default

    I have the same issue with my current RO. Had to plumb in a bypass valve for flushing and washing.
    Maple Rock Farm
    www.Maplerockfarm.ca
    400 taps on Vacuum
    18”x60” Lapierre propane evaporator with Smokey Lake auto draw off
    Homemade 3 post RO with MES membranes
    Ford TS110 tractor sap hauler

  5. #5
    Join Date
    Mar 2011
    Location
    North Grenville, Ontario
    Posts
    801

    Default

    4EF3CD1D-2D6A-4A31-987A-CFEF99B7E215.jpg4EF3CD1D-2D6A-4A31-987A-CFEF99B7E215.jpgI just replaced my needle valve on my RO. I was having the same issue.
    In the picture attached you can see how small the port is inside the valve( $17 EBay) This was causing my pressures to be at 150 psi with the valve wide open. Last year I plumbed a bypass controlled with a ball valve and it fixed this problem.
    I bought a proper needle valve from freshwatersystems.com ($69)and it is full flow. I still have the bypass. And when washing I open it up as well for more flow.
    It’s worth paying good money for a needle valve it’s pretty important.
    Last edited by Bricklayer; 02-08-2020 at 02:34 PM.
    400 taps on vacuum
    Lapierre Releaser
    2x5 Phaneuf
    Auber auto drawoff
    Homemade arch with AUF
    Homemade RO single 4" MES 4040 membrane
    CDL 16 x 16 bottler
    Wesfab 7" short bank filter press
    Delaval 73's

  6. #6
    Join Date
    Nov 2018
    Location
    Franklin, PA
    Posts
    44

    Default

    I took the advice of a bypass. This year I built a manifold with a ball valve, a gate valve and a needle valve. Now I can flush at zero psi and have complete control of the pressure. Very happy with the suggestion to do that.
    2019 290 taps on 3/16"
    2018 20 taps on milk jugs
    2017 10 taps on milk jugs

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