Gents .
before few days we faced problem in our screw sabroe compressor 151 that compressor run few seconds and stop with out alarm . after monitoring we found the capacity not increase that mean still zero also the oil pressure after stop still gives 1.2 bar . but if shutoff the suction valve . the oil pressure gives zero bar .
I suspect the suction check valve not working Correctly , Although I checked that valve physical and we don't found any thing trouble .
can you please help us to solve that issue .
thank you for all .

yacoub