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  1. #1
    Member Freshman Undergraduate
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    Proper Way To Set Unloader Valve

    Can someone please explain what is the best way to set the unloader valve? I have a Shark HPB Junior rated at 3.5GPM @ 2000psi

    Thanks for any help

  • #2
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    Would that be for a pressure or flow actuated type unloader?

  • #3
    Dean 4000 PLUS POSTER Grant's Avatar
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    PRESSURE ADJUSTMENT: Setting and adjusting the unloader
    pressure must be done with the system “on”. Start the system with
    the unloader backed off to the lowest pressure setting. Squeeze
    the trigger and read the pressure on the gauge at the pump. If more
    pressure is desired, release the trigger, turn adjusting nut one quarter
    turn, squeeze the trigger and read the pressure. Repeat this process
    until desired pressure is attained. Pressure fluctuation from
    this established system pressure is minimal with the opening of
    each additional gun.
    Monitor the by-pass flow at each adjustment. If the by-pass flow,
    with all guns or valves open, drops below 5% of rated unloader flow,
    STOP ADJUSTMENT. The nozzle(s) selection is improperly sized
    to achieve the desired system pressure.
    Proceed by accepting the attained pressure OR selecting a smaller
    or fewer nozzles OR increasing the pump RPM providing you
    stay within specifications OR selecting a larger pump or dual pumps.
    Once the desired system pressure is reached, stop adjusting and
    set the top locking nut to hold the system pressure. Do not read the
    pressure at the gun or nozzle for setting system pressure.
    Check the nozzle(s) as part of regular maintenance and replace if
    worn. Do not adjust unloader pressure setting to compensate
    for worn nozzle.

  • #4
    Dean 4000 PLUS POSTER Grant's Avatar
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    That was swiped from a CAT Pump web site.

  • #5
    Equipment Expert 3000 PLUS POSTER Russ Johnson's Avatar
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    That is the proper way to adjust a flow controlled unloader. For a pressure actuated unloader, squeeze the gun and adjust the valve in until operating pressure is reached. Release trigger and watch spike pressure. It should be about 10% more than operating pressure.

  • #6
    Exterior Restoration Specialist 21000 PLUS POSTER Ron Musgraves's Avatar
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    Great Info Grant
    Ron Musgraves


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  • #7
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    Where are you guys reading the pressure from? My machines dont have pressure gauges built in so where would I put one inline for proper reading?
    Calvin Andrus Construction LLC., Pressure Washing Division.
    Central Oregon's "Clean & Green" Water Reclaimer
    www.greenpressurewash.com
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  • #8
    Member Honorary Professor Sirocco Jerry's Avatar
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    Adjusting an unloader valve

    Quote Originally Posted by Russ Johnson View Post
    That is the proper way to adjust a flow controlled unloader.
    For a pressure actuated unloader, squeeze the gun and adjust the valve in until operating pressure is reached.
    Release trigger and watch spike pressure. It should be about 10% more than operating pressure.
    ...absolutely !!
    ..and for more detail..
    click here.. Adjusting an unloader valve>

    Pressure gauge should be at the unloader outlet,
    but if you have 2.. get one on your Hose reel..
    you might be shocked at what it tells you.
    Last edited by Sirocco Jerry; 03-15-2013 at 05:18 PM. Reason: add in
    Jerry McMillen


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  • #9
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    How do you tell the difference between a flow and pressure unloader? Either of them better? I never see a pressure spike when pulling the trigger...goes up slow....takes about 4 seconds to reach pressure. What kind of unloader is this?
    Buy cheap, buy twice.

    Ben Kohn
    Owner of From Sinks to Sewers
    (805)758-5901
    Ventura, CA

  • #10
    Graphic Designer Professor with Tenure "Red"'s Avatar
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    Quote Originally Posted by snagtooth View Post
    Where are you guys reading the pressure from? My machines dont have pressure gauges built in so where would I put one inline for proper reading?
    This is how I have mine set up (ignore the gauge on the right, it was defective). The gauge on the left is attached to a hose.



    Derrel


    ALLRED Graphic Design
    "This is my World "

  • #11
    Member Honorary Professor Sirocco Jerry's Avatar
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    Quote Originally Posted by gear junkie View Post
    How do you tell the difference between a flow and pressure unloader? Either of them better? I never see a pressure spike when pulling the trigger...goes up slow....takes about 4 seconds to reach pressure. What kind of unloader is this?
    pressure coming up slowly..
    is a "flow actuated" unloader.

    Pressure actuated unloaders "trap" a spike pressure of more than working pressure after the unloader,
    and that pressure "gushes" out when you pull the trigger gun.
    Jerry McMillen


    619-448-8111 ............800-400-2532
    www.PressureWasher.net e-e at.. Jerry@PressureWasher.net
    Sirocco Performance Vacuums, ..... the VacuBerm,
    and BullDogPro Industrial Water Blasters

    Our tools increase your profitability

  • #12
    Member Sophomore Undergraduate
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    Thanks Jerry, What's the advantage to a pressure unloader?
    Buy cheap, buy twice.

    Ben Kohn
    Owner of From Sinks to Sewers
    (805)758-5901
    Ventura, CA

  • #13
    Member Honorary Professor Sirocco Jerry's Avatar
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    Pressure actuated unloaders are this.. very specifically,
    .. by request of every dealer they have in the world..
    ..cheaper.. SImple as that.
    I have HOUNDED AR, Comet, Giant, Suttner, and MTM.. to build one..
    We NEED a 4000 psi Flow-Actuated unloader that does NOT cost $500.
    A K-7 unloader is flow actuated, but doesn't like doing over 3500psi.. they were designed for 3000.
    the K-5 unloader is 3000 psi max, and not rebuildable (affordably).
    The Giant version for 4000 psi.. is only good for 4gpm.. that doesn't count fore much.

    Pressure Actuated unloaders are especially helpfull in multi-wand systems.
    ..you can divide flow easily, due to the regulating function of the valve.
    otherwise..
    Pressure Actuated unloaders are less expensive to build.
    Jerry McMillen


    619-448-8111 ............800-400-2532
    www.PressureWasher.net e-e at.. Jerry@PressureWasher.net
    Sirocco Performance Vacuums, ..... the VacuBerm,
    and BullDogPro Industrial Water Blasters

    Our tools increase your profitability

  • #14
    Member Junior Undergraduate nibbsy's Avatar
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    Hi Jerry,
    Have you looked that these VB 80/280 Zero – Flow sensitive unloader valve
    They also have a smaller brother
    http://www.sadit.co.il/Up/technical_...ns/5614015.pdf

    I will have been running one beyond spec successfully for the last 18 months 4300psi at 8glm
    Greg 0427760375
    Townsville Concrete Cleaning
    North Queensland Australia
    http://www.townsvilleconcretecleaning.com.au/
    https://www.facebook.com/pages/Towns...24623111057044

  • #15
    Member Senior Undergraduate starbrite's Avatar
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    Hey greg, where do you get them ?
    Robert Naughton STARBRITE ATLANTA 404-934-1309 www.starbriteatl.com http://atlanta.pressurewashing.net http://knoxville.pressurewashing.net
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  • #16
    Member 2000 PLUS POSTER tomtucson's Avatar
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    Is there a flow sensitive unloader that doesn't shove the water through a pinhole?
    Tom Cusick
    Liquid Heat
    Tucson Arizona 520-247-3944

  • #17
    Member 2000 PLUS POSTER tomtucson's Avatar
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    Greg Queensland mentioned the Pulsar http://www.sadit.co.il/Up/technical_...ns/5614015.pdf which I had only seen in 8 gpm. Cat has this http://www.catpumps.com/products/pdf...seUnloader.pdf which looks the same actually. E-spec has the quantum z which is one of those if I am not mistaken. These flow unloaders with spring adjust - are they better?
    Tom Cusick
    Liquid Heat
    Tucson Arizona 520-247-3944

  • #18
    Exterior Restoration Specialist 21000 PLUS POSTER Ron Musgraves's Avatar
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    Jerry Please Fix that Link
    Ron Musgraves


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