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  1. #1
    Super Member Iplayfarmer's Avatar
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    Default Air Compressor 12 volt pressure switch

    At some point I'd like to make an engine driven air compressor. How are engine driven compressors pressure regulated?

    I'd probably drive the compressor with an electric PTO clutch. I figured that I could use a 12 volt pressure switch that would turn the clutch on when the pressure drops below a set point and then turns it off when the pressure builds sufficiently. Problem is I'm not finding a lot of 12 volt pressure switches.

    Is there some other way that the engine driven compressors regulate their pressure?

    Could I just use a 120 volt pressure switch?
    Last edited by Iplayfarmer; 09-11-2008 at 06:11 PM. Reason: Forgot something
    From now on I will only buy cars that are a silver/grey color. Then I can make all body repairs with Duct Tape.

  2. #2
    Silver Member barneyrb's Avatar
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    Default Re: Air Compressor 12 volt pressure switch

    This switch Configuration Results is just a electro-mech that won't care what voltage it gets.

  3. #3
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    limerick pa lycoming county pa
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    kubota bx23

    Default Re: Air Compressor 12 volt pressure switch

    they continue to run compressor and have and unloader in the discharge line or

    like granger #4TK14 it is the control I used to change my electric generator to gas to build my cabin (off grid) with a 8 hp gas engine

    On the big construction compressors they have a control that holds the intake valve open exhaust valve is a check valve. and the air goes in and out intake valve and dosen't compress.


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  4. #4
    Elite Member DieselPower's Avatar
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    Default Re: Air Compressor 12 volt pressure switch

    Wired properly you can use most any electromechanical pressure switch with the correct pressure setting. Just don't run the main power to the compressor through the switch, run it through a relay. Not all pressure switchs are rated for high current draw.

  5. #5
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    Default Re: Air Compressor 12 volt pressure switch

    Kubota BX23, BT600 BH, LA210 FEL, Maschio L125 tiller, Gearmore BB 20-48 BB, King Cutter 6' rear blade, Homemade PHD, Brinly BST-50 broadcaster, ? 6' cultipacker, log & chain drag.

  6. #6
    Epic Contributor Soundguy's Avatar
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    Default Re: Air Compressor 12 volt pressure switch

    Quote Originally Posted by DieselPower View Post
    Wired properly you can use most any electromechanical pressure switch with the correct pressure setting. Just don't run the main power to the compressor through the switch, run it through a relay. Not all pressure switchs are rated for high current draw.
    He could get a well head pressure switch.. if he could get one in his pressure range.. or one with enough adjustement to do so.. etc..

    soundguy

  7. #7
    Super Member Iplayfarmer's Avatar
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    Default Re: Air Compressor 12 volt pressure switch

    I was hoping that a few people would chime in that I could just use a 120 volt switch like a well head type switch.

    Wouldn't the well head switch handle plenty of current without having to go through a relay.
    From now on I will only buy cars that are a silver/grey color. Then I can make all body repairs with Duct Tape.

  8. #8
    Gold Member
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    Default Re: Air Compressor 12 volt pressure switch

    Yes you could use a 120V pressure switch to operate a magnetic clutch, without a relay.

    I used a 240V pressure switch to operate a 12V magnetic clutch that draws 4.7 amps.

    Was warned to use a relay as the greater 12V current could cause the contact points in the pressure switch to burn.

    Decided to try it without the relay and it's now done two pruning seasons of operating a compressor, each season about 16 - 17 weeks and about 54hrs a week.-mvc-711f-jpg

    -mvc-713f-jpg

    -mvc-714f-jpg

  9. #9
    Super Member Iplayfarmer's Avatar
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    Default Re: Air Compressor 12 volt pressure switch

    Quote Originally Posted by allenr View Post
    Yes you could use a 120V pressure switch to operate a magnetic clutch, without a relay.

    I used a 240V pressure switch to operate a 12V magnetic clutch that draws 4.7 amps...
    What kind of magnetic clutch is that?

    I was just thinking I'd get a PTO clutch off the bottom of a lawn mower, but yours looks different.
    From now on I will only buy cars that are a silver/grey color. Then I can make all body repairs with Duct Tape.

  10. #10
    Epic Contributor Soundguy's Avatar
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    Default Re: Air Compressor 12 volt pressure switch

    That's funny that they told you you needed a relay.. 12v at 5a is 60w.. 240v at?20a ( well current )is 480w.. and lots of cycle times. 60w ain't nothing...

    soundguy

    Quote Originally Posted by allenr View Post
    Yes you could use a 120V pressure switch to operate a magnetic clutch, without a relay.

    I used a 240V pressure switch to operate a 12V magnetic clutch that draws 4.7 amps.

    Was warned to use a relay as the greater 12V current could cause the contact points in the pressure switch to burn.

    Decided to try it without the relay and it's now done two pruning seasons of operating a compressor, each season about 16 - 17 weeks and about 54hrs a week.-mvc-711f-jpg

    -mvc-713f-jpg

    -mvc-714f-jpg

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