Dump valves for pop off systems
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Dump valves for pop off systems

  1. #1
    Senior Member Boat 405's Avatar
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    Default Dump valves for pop off systems

    Here is a valve that is commonly used for a Pop-off system. A quick dump valve, mounts inside the boat one end connects to the top fitting on the pop off valve and the other plugs into the 5/32 pressure line from the co2 tank. About $20


    McMaster-Carr

    Boat 405.

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    Ralls Precision Machine Ballztech's Avatar
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    Asco 12V Solenoid Air Valve

    • Port Size: 3/8" FNPT or 1/2" FNPT
    • Brass Construction
    • Normally Closed
    • 300 PSI Maximum Pressure
    • Optional Mounting Brackets Available

    SKUAsco-38-12

    I like this one for the pop off dump. Very easy to use and set up. $34.00 Asco 12v Solenoid Air Valve - Pro Performance

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    Senior Member Boat 405's Avatar
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    They both do the same thing, except the top one needs no electronics just air. The lower one needs 12 volt power. Both will work great. Just a preference. Thanks Andy
    Last edited by Boat 405; 03-11-2015 at 01:17 PM.
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    Ralls Precision Machine Ballztech's Avatar
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    Kjell, you are correct. Although, with the 12v operated dump valve you do not need to use the additional "shuttle valve" ( MME-41PEE-D012 ) to operate the dump. I have had a couple fail, they can be temperamental from time to time. I have never used that set up on my pop off due to this. I only use this part for the fwd/rvs control.

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    Senior Member Boat 405's Avatar
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    Cool, that will work too.
    Boat 405.

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    Senior Member Sweet Pickle's Avatar
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    Andy do you rely on the water pressure to push the popoff piston up? If so what holds it down til you open the dump valve? My system is similar to Kjells and works good but always curious

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    Ralls Precision Machine Ballztech's Avatar
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    Quote Originally Posted by Sweet Pickle View Post
    Andy do you rely on the water pressure to push the popoff piston up? If so what holds it down til you open the dump valve? My system is similar to Kjells and works good but always curious
    Yes, intake pressure opens the valve. Co2 pressure keeps it shut. Its important to make sure you have NO leaks on the pressure side. As you can imagine, its such a small pressure vessel that even a very small leak will result in a intake leak going down the track. We have had good success with the solenoid dump set up. Its very easy to hook this up to your data system and get the valve to release pressure (allowing it to open) at a pre-set intake pressure level. We verify this with regulated co2 pressure. Works great.

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    Senior Member Sweet Pickle's Avatar
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    So no reset until your back at the pits? Or do you apply CO2 pressure while in the driver seat?

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    Ralls Precision Machine Ballztech's Avatar
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    I usually will "bump" the fill button a couple times to seal the intake back up. I think it provides better water supply to the engine. Especially after ringing its neck for a 1/4 mile. I'm not sure if I'm helping anything by doing this but its what I do.

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    Senior Member TNYoungblood's Avatar
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    Default Dump valves for pop off systems

    Thanks for posting this guys. I'm in the process of rigging up my valve and could use all the info you could post 👍


    Sent from my iPhone using Tapatalk
    Last edited by TNYoungblood; 03-02-2015 at 06:16 PM.
    WFLC The REAL #321 Kentucky Drag Boat Association 2016 NJBA 10.0 High Points Champ

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    Senior Member Sweet Pickle's Avatar
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    10-4 Thanks for the info Andy

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    149 Tsunami BGJ 153 MPH
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    Quote Originally Posted by widowmaker View Post
    March 4, 2015

    Hello People

    That 6646K34 McMaster-Carr valve can be used in the popoff system without air pressure on the up stroke.
    The Quick release exhaust valve only needs positive pressure to set and when removed, the static pressure from the water will lift the popoff piston.

    You just have to make sure the intake / exhaust port at the bottom of the popoff is not in the water.

    Willis
    Last edited by 149 BGJ; 03-04-2015 at 09:07 AM.

    149 Tsunami - 153 MPH @ 6.93

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    Senior Member TNYoungblood's Avatar
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    Hey guys i'm in the process of installing my Miersch valve in the boat and really starting from scratch .. Could yal do a parts list of what is needed on a valve install and a run down on how everything works ..



    thanks
    WFLC The REAL #321 Kentucky Drag Boat Association 2016 NJBA 10.0 High Points Champ

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    Senior Member PCE680's Avatar
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    Quote Originally Posted by TNYoungblood View Post
    Hey guys i'm in the process of installing my Miersch valve in the boat and really starting from scratch .. Could yal do a parts list of what is needed on a valve install and a run down on how everything works ..



    thanks
    Mike...Call Roy Mierch.He is very helpful.

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