GEA Grasso V Series Installation And Maintenance Instructions Manual

2.8 DISMANTLING, INSPECTION AND RE-ASSEMBLY OF SUCTION AND DISCHARGEVALVESHint!A high working temperature and rapid temperature variations shortenthe life time of the valves, which, for this reason, require regularinspection.The suction and discharge valves of a refrigeration compressor are parts that areheavily loaded both mechanically and thermally. Wear and life time of the valvesstrongly depend on the working conditions of the compressor. It is recommendedthat valve condition is regularly checked.For dismantling, inspection and re-assembly of the valves, refer to the relevant paragraph of the CompressorService Instruction Manual.Hint!In order to reduce the downtime involved in the valve inspection, it isrecommended to have as many complete valve assemblies in stock asthere are cylinders on the compressor.These valves can be exchangedwith the original valves; in this case, these original valves can beinspected and repaired or replaced if necessary later.2.9 COMPRESSOR PURGINGProcedure to purge the compressor (after maintenance jobs):STATUS:Stop valves of suction, discharge and oil return line are still closed (refer toSection 2.5, Page 33) and compressor is filled with oil (refer to Section 2.6,Page 35).i. Connect a vacuum pump to the evacuation/purging valve(s) and evacuate asprescribed by local regulations. For the location of these valves refer to the"Product Information".ii. When evacuation is completed open the discharge stop valve.iii. Watch suction and discharge pressure.Hint!If suction pressure increases quickly, the discharge valve assy isleaking.iv. Start compressor.v. Slowly open suction stop valve.vi. Open the stop valve in the oil return line of the oil separator (if present).vii. For two stage compressor only;vii.a Two-stage system A/B: open liquid supply to interstage cooler.vii.b Two-stage system C/D: refer to the plant manual.INSPECTION AND TROUBLE SHOOTINGDISMANTLING, INSPECTION AND RE-ASSEMBLY OF SUCTION AND DISCHARGE VALVES0089288gbr_1136 30.10.2017