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Ingersoll Rand DR250 Gyro Flo Compressor

C

cecil bearden

New User
It is a DR250 Ingersoll250 cfm sliding vane compressor... It builds up to about 105psi and slows the engine down then still builds up to 185 psi and blows the relief. I need to find a way to drop the final pressure. It has a small regulator that has 2 outlet connections,, one goes to the inter stage pressure gauge and the other goes to the idle controller, and then out of the idle controller to a diaphragm on the air intake side. The little regulator had a broken diaphragm, so I installed an old Oxygen regulator in its place, but it makes no difference. I removed the lines from the idle controller and it works and has flow through and then goes to the diaphragm on the air intake. I put air into the diaphragm on the intake and hear it moving. I even removed the diaphragm assembly and it pushes on what looks like a small cast finned turbine that moves in and out. I have not gone any further. Can anyone help. I have to keep a large compressor available to blow out my round baler daily or it starts shearing pins. I also have to keep the swather blown out to prevent the belts from slipping off...
 
The regulator is probably an unloader that operates in entirely different ways than an oxygen regulator. Replace it with an original, or rebuilt. Jim
 
I think this style compressor runs in a load or unload state. It modulates as the need for air goes up or down. The correct pressure gauge that regulates this is a must.
 
The regulator I removed was nothing special, just a small pressure regulator. I agree it should be one that will regulate up to 150 PSI to be safe, but it is just a common pressure regulator. I think the problem may be the diaphragm that presses against the unloader valve may have a leak.
 
I will look tomorrow, but I believe I've got a book showing a breakdown of the regulars, and the correct way to set them back up.

Short explanation the compressor is designed to start wide open/full CFM output. When it reaches the set pressure, the regulators cause it to close the intake valve, thus starving the compressor for air and regulating the output that way.

I've worked on quite a few of the larger units, but IR maintained basically the same regulating setup across the different ranges of CFM from what I have seen. In any case, it will require the correct parts to operate like it should.

I'll see what I can find and get back to you.
 
I restate, a unloader device is not a regulator, it is bistable, and has a range of pressures within which it functions. Your relief valve seems to be working, If it were not it could be a literal killer. Look up unloader regulator design. Jim
 
I think I have found
the problem. The small pressure regulator is installed backwards. The
way it was connected it could not get pressure to move the diaphragm
away from the valve. The speed regulator closes the intake valve
and the small pressure regulator is connected to the back side of the
diaphragm so that it pushes the intake valve off the seat when the
pressure drops. I determined there was something wrong after I talked to an old compressor dealer in Louisiana
and I looked at the assembled diaphragm body again. I believe the Oxygen
regulator will work just fine. The flow diagram in the book supports my
theory. I think that the original pressure regulator was a special one
in that it had 2 or more inlets. It was replaced with one that had 3
outlets and the installer just connected the lines to the easiest
outlets. With a tee and a couple of nipples, it should be working
fine.
 
NCWayne
I hoped you would see this. I had some problems with my login a couple of days ago and could not post. From all that I have read in the parts book and the operation manual, this small pressure regulator is not a special type, it just needs to be of adequate pressure rating.
 
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