1. certificate:ISO9000;CCS,ASME,CE 2.material:carbon steel,alloy steel 3.the company has a history over 35 years XJF stop control valve for accumulator used with bladder accumulator.the main plug is one for hydraulic balanced conical valve,with a special oil drain designed for accumulator. the valve is characterized by small opening force,reliable sealing,small size,light weight,simple structure ...