... pres. grade:10,20,31.5Mpa. 4.timely delivery. this universal charging and testing unit of accessory to fill the nitrogen for ... valve is used to charge the accumulator.3.note:after charging,the connector between nitrogen cylinder and accumulator should be ... the bleed valve of charging tool to exhaust completely the gas in hose,finally,unload the charging tool. universal charging and testing unit,special ...