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Tool Talk Discussion Forum

pto air comp, how do i regulate the air?

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markct

02-13-2004 08:13:59




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i just got a 15 hp compressor that is 3 phase and pretty old, what i want to do is take the compressor head and run it with the 540 pto from my tractor, setting it up is no problem mechanicly, but i need to find an unloading valve or some sort, like the ones on a gas powered air compressor where it lets the compressor run under no load so to speak, any ideas? i need something not too expensive of course too!

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markct

02-13-2004 10:30:50




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 Re: pto air comp, how do i regulate the air? in reply to markct, 02-13-2004 08:13:59  
ok i just talked to one of the guys here who has worked on the compressor before, he showed me that it does have the unloader valves on the head, there is a 1/4 copper line that when air is applied to it holds the compressor valves open, the way it is set up now there is an electic pressure switch and and electric solenoid valve which sends air pressure to the unloader in the head when pressure is reached, so im thinking of changing the solenoid to a 12 volt solenoid and running it that way, unless i can find a pressure switch that would open and air valve intead of the usual electric contacts

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jimlll

02-13-2004 13:31:07




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 Re: Re: pto air comp, how do i regulate the air? in reply to markct, 02-13-2004 10:30:50  
The pilot unloader I referred to will connect between the air receiver and the compressor's valve unloaders. I'm looking at a 2001 Grainger catalog, item #3x818 and listed for $12.80. You may be able to view and updated price at www.grainger.com
hope this helps,
jim



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markct

02-13-2004 16:26:20




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 Re: Re: Re: pto air comp, how do i regulate the ai in reply to jimlll, 02-13-2004 13:31:07  
so your sayin that if i buy that valve from graingers then i can simply plumb it to tank pressure and then the other side to the unloaders in the head and be done with it, is it adjustable for pressure or like preset? i cant find my grainger catalog right now.



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george md

02-13-2004 11:51:00




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 Re: Re: pto air comp, how do i regulate the air? in reply to markct, 02-13-2004 10:30:50  
Mark, Being that you have the unloader valves built in the head life becomes much easier, get an air governor
for the air comp on truck brake sys . That is what I used on
the last one I built for a customer , they are cheap and readily available .

george



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jimlll

02-13-2004 09:18:09




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 Re: pto air comp, how do i regulate the air? in reply to markct, 02-13-2004 08:13:59  
You did not identify your compressor. Hopefully it has unloader type valves. A separate device, called an unloader is connected to the air receiver by a tube and when the pressure in the receiver reaches the set point of the unloader valve, it conveys air to the compressor's unloader type valves by tubing and prevents the intake valves from seating. When the receiver pressure drops below a set point, the unloader valve bleeds the air from the compressor unloader valves and they operate normally. In the unloaded mode, the compressor continues to rotate but does not compress air.
Unloader valves are available from w. w. Grainger.
Safety is very important. Be sure to guard the drive mechanism, employ a safety valve, etc.

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Ben in KY

02-13-2004 08:57:55




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 Re: pto air comp, how do i regulate the air? in reply to markct, 02-13-2004 08:13:59  
Just use the pressure switch that is on it to turn on and off an electric clutch in the driveline assembly somewhere. If you are handy you can rig one off of an old automotive A/C compressor.



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markct

02-13-2004 09:34:37




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 Re: Re: pto air comp, how do i regulate the air? in reply to Ben in KY, 02-13-2004 08:57:55  
well an automotive electric clucth would never take 15 hp i dont think, and i didnt realize that the unloaders were specific to the compressor head, the compressor i have doesnt have any sorta thing for the unloader to operate the valves, it was just set up to turn on and off electricaly, maybe i will just get a very large relief valve and simply allow the air to dump out that way, not as good as a true unloader but simple and cheap, and safe as long as the reliefvalve is big enough. i wont be using it very often, just maybe ocassionaly to sandblast or maybe run a small jackhammer intermittenly.

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Ben in KY

02-13-2004 11:42:03




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 Re: Re: Re: pto air comp, how do i regulate the ai in reply to markct, 02-13-2004 09:34:37  
Northern Toold sells hydraulic pumps with AC clutches on them. Also about 15 years ago I helped a friend convert a 2 stage compressor to run belt driven off of his engine with an AC clutch. Had to have a machine shop turn the end of the compressor crank to fit in the clutch.



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Bob

02-13-2004 10:04:36




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 Re: Re: Re: pto air comp, how do i regulate the ai in reply to markct, 02-13-2004 09:34:37  
Mark,

Here's a continous run unloader that just dumps the air, and a special comperessor is NOT needed. It's not even too pricey, and is usable on a wide range of CFM capacities, and pressure set points.

Link

The electric clutch option might be viable, too. Garden tractors use electric clutches very similar in size to the older, larger A/C clutches, and they carry 12 to 18 HP, or even more. The problem is the clutches are rated by torque they will carry, so if you are using a 1000 RPM PTO, and the clutch turned that speed, it would carry only about 28% of the horsepower it would running at the standard small gas engine RPM's of 3600.

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buck

02-13-2004 09:58:33




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 Re: Re: Re: pto air comp, how do i regulate the ai in reply to markct, 02-13-2004 09:34:37  

I have seen the relief valve used in this fashion before-makes things simple but like you said-think big valve



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