So I understand that compound compressors are basically doing some sort of two stage compression. I understand that this is to mitigate compression ratio problems. I also understand that there is an interstage that is fed by a valve (forgot the name) but on my low temp rack it maintains an interstage pressure of around 45-50ish. I have been told that to test the valve plates, you close off the ball valve from the interstage supply. If the pressure drops considerably, you have bad low stage valves and if the pressure goes up, you have bad high stage. I also know the "by feel" trick where you touch the two sides of teh low pressure heads.
My question is, why can't I just test it by pumping it down like a regular compressor? Like what if I were to pump down the suction side and the interstage side? I only ask because I have a large body compound and when I do an interestage test, it pumps down about 10 psi. I've been told that this is kinda at the cusp of normal. I keep getting lockouts. I've done my do diligence on all the oil pressure shit feeding the compressor so I know that isn't the problem. I also have good oil pressure coming out of the oil pump. I'm gonna take it apart and check the valves but I hate doing it. Kysor rack has almost no space and some of those bolts are a bitch to get a socket onto. I hate that there is "a cusp". I was wanting to see if there was another more definitive way of testing.
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