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Thread: 3000psi

  1. #1

    3000psi

    So my new shoebox is a bigger hit than I expected with the local players. I have had people calling me wanting to come by and fill tanks. I guess I'm antisocial, so I ordered a scuba tank to be able to offer fills at the game.

    I'm not super comfortable filling a 3kpsi tank with a compressor that will be perfectly happy to fill to 4.5k. Yes, I can shut it off early, but that is a fairly unreliable control.

    If I wanted to CONVERT my shoebox to 3k psi, including a new burst disk so that it isn't a dual-pressure setup, and is safe, what would be the recommended way to do that? Move the switch? Adjust the vertical arm that hits the switch? New Spring?

    If you (AGD) are looking for a 3k field tester, I'm interested.

    Thanks,
    'wose

  2. #2
    Join Date
    Jun 2010
    Location
    In the Box shop
    Posts
    41
    Quote Originally Posted by Woodwose
    If I wanted to CONVERT my shoebox to 3k psi, including a new burst disk so that it isn't a dual-pressure setup, and is safe, what would be the recommended way to do that? Move the switch? Adjust the vertical arm that hits the switch? New Spring?

    Thanks,
    'wose


    Pleasae dont mess with the safety of your ShoeBox. There is no recommended way. We will not advise support or condone messing with the built in safety features.

    DO NOT MOVE the switch. DO NOT attempt to adjust the vertical arm that hits the switch.
    DO NOT MESS with the spring. The springs are custom made.

    We will offer 3000psi ShoeBox's for sale in the near furture.

  3. #3
    Join Date
    Dec 2000
    Location
    offshore
    Posts
    7,210
    Once you figure out how long it takes to fill your tank just put the shoebox on a timer to shut it off.
    Email me for low prices on ALL AGD Products and more. tunaman5@verizon.net
    Tunamart

  4. #4
    Gotcha. No messing with the Shoebox. I will "put my hands in my pockets and walk away".

    I like the timer idea Tuna. Thanks.

    What about one of the electric pressure shutoff switches that have been mentioned before, plumbed in after the outlet of the compressor?

    Like mcmaster-carr part 3427K83 which shuts off at 400-4700psi? The 5 amp rating should be plenty to wire in directly, and +-1.5% would be a very nice and tight shutoff range.

    Thanks,
    'wose
    Last edited by Woodwose; 07-09-2010 at 10:49 AM.

  5. #5
    Join Date
    Jul 2008
    Location
    Minneapolis
    Posts
    115
    Quote Originally Posted by Woodwose
    Gotcha. No messing with the Shoebox. I will "put my hands in my pockets and walk away".

    I like the timer idea Tuna. Thanks.

    What about one of the electric pressure shutoff switches that have been mentioned before, plumbed in after the outlet of the compressor?

    Like mcmaster-carr part 3427K83 which shuts off at 400-4700psi? The 5 amp rating should be plenty to wire in directly, and +-1.5% would be a very nice and tight shutoff range.

    Thanks,
    'wose
    that's pretty good.

  6. #6
    I picked up one of those pressure switches, and as soon as I have it hooked up, I'll post a trip report.

  7. #7
    Join Date
    Jul 2008
    Location
    Minneapolis
    Posts
    115
    Quote Originally Posted by CrazyLittle
    I picked up one of those pressure switches, and as soon as I have it hooked up, I'll post a trip report.
    didn't realize you got a shoebox. how much was the switch?

  8. #8
    I recommend anyone wanting reduced pressure filling invest in a HP regulator.

    Get one that will do 6,000psi inlet and 0 to 3,000 or even 5,000psi output.
    That will keep the safety shutoff intact and seperate from the reduced pressure you need.
    Set the reg at 3,000psi and fill to your hearts content.

    The bottle will have 3,000psi in it and the reg supply will go up to the shutoff and stop.
    I am going to do this and I beleive there is an additional gain. The time that the spring arm slaps at the switch will be very short as it will only build pressure into a small volume upstream of the regulator.

    'Tis 'ow 'm gonna do it

    Walter....

  9. #9
    Quote Originally Posted by Voltar1
    I recommend anyone wanting reduced pressure filling invest in a HP regulator.

    Get one that will do 6,000psi inlet and 0 to 3,000 or even 5,000psi output.
    That will keep the safety shutoff intact and seperate from the reduced pressure you need.
    Set the reg at 3,000psi and fill to your hearts content.

    The bottle will have 3,000psi in it and the reg supply will go up to the shutoff and stop.
    I am going to do this and I beleive there is an additional gain. The time that the spring arm slaps at the switch will be very short as it will only build pressure into a small volume upstream of the regulator.

    'Tis 'ow 'm gonna do it

    Walter....
    Most regulators I have seen bleed or bypass any air above their set pressure. So I think the Shoebox would never reach shut off pressure and run continuously. The tank would have set pressure though.

  10. #10
    Quote Originally Posted by MikeB
    Most regulators I have seen bleed or bypass any air above their set pressure. So I think the Shoebox would never reach shut off pressure and run continuously. The tank would have set pressure though.
    Never had occasion to see or use any such regulator as you describe. The regs for this app will not vent or bypass and will 'shutoff' when the downstream pressure is reached. As there is no longer air leaving the fill system the Shoebox will build to the mechanical shutoff setpoint.

    So I have no idea where you have dealt with such regulators but I have yet to see one.

    Walter....

  11. #11
    In my fittings assortment I found a neat little device that will work for teh Shoebox to control output pressure.

    It is made by Chemiquip and model is PLV 255 available with a 1,000 to 3,000psi spring.
    1/4" npt threads and easily adjustable.

    Got mine hooked up and the compressor makes air up to 3,000psi at which time the PLV (pressure limiting valve) closes off the inlet. The compressor happily continues to run up to the 4500psi that the cutout is adjusted for. What is coolest to me is the arm is not slapping at the on/off switch until the last minute of running. Pressure ramps up quickly as the volume is small.

    I like it and may get another set for 4500 if they are available.

    Walter....

    oh BTW will see what they are worth
    Last edited by Voltar1; 08-20-2010 at 12:31 PM.

  12. #12
    Been using the Pressure Limiting Valve fo a few fills now. I reccommend this as an accesory for all airgunners that have a reduced pressure fill requirement. It is now my opinion that Tom setup the compressors for 4500 and be done with that.

    The Limiter is $88usd in brass and IMO a great deal.

    Walter....

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