u/Glass_Pen149

So I have a TACO R53-201-00B0 valve on a pneumatic cylinder system. Service techs think the valve is bad (or just dirty). It appears the valve is discontinued?, I cannot find any docs on it.

AFAI can tell, it is a pilot operated relief valve. It regulates a vertical gravity load on a pneumatic cylinder attached to a servo motor.

The cylinder pressure should remain somewhat stable (in a narrow range) when moving up or down. In this case the pressure climbs/falls additively. IOW, with the load moving up, the pressure keeps rising. With the load moving down, the pressure drops. When the pressure reaches the limits, It shuts down the servo drive, protecting the motor. (Overcurrent)

How can I test the valve? Does it sound like the pilot line or metering orifice is clogged? Or perhaps dirt on a piston seal? If I put a pressure gauge on the bypass/bleed port, will I see a pressure increase/decrease when the cylinder is moving?

It seems to me, that regulating a constant output pressure requires bleeding excess, siphoning air when needed.

I have a pilot operated regulator on a machine. TACO Model R53-201-00B0. It balances the Z-axis using an air cylinder. OE Techs think it might be bad/dirty, as it appears to be loading down the z-servo, during motion. Control has a z-force feedback. I set the balance force to 0, but it climbs/drops too fast/quick as the z-axis moves, causing too high a load, so the servo alarms.

I cannot find any info on it. I believe it has been discontinued.

How can I test the regulator, to verify it is working right?

I found some remnants of broken air line inside. I know they replaced the OE air pressure regulator. So I suspect the pilot or control orifice is clogged or restricted.

I need to remove the epoxy potting on a set of motor coils, ideally without destroying the windings and wire coatings. Is this possible with sulfuric acid? Or another acid or solvent combination? Does the acid/solvent need to be heated? Or does that just speed the process?

We have tried MEK, Xylene, Acetone with zero effect. Time to step up our effort another level.