“FOR HYDRAULIC SLEWING CRANE MAKER:JANG SU HUAIYIN Marine Machine Co. LTD TYPE:250KN x 28M SERIAL NO:092131” COUNTERBALANCE VALVE, Pos.23. DRWG.242HCJ-25025-00YL. Hyd. System diagram. JIANGSU HUAIYIN MARINE MACHINERY.250KN*28M