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Charging accumulator with N2 gas
1. After performing the inspection steps 1 to 4 of charge pressure, remove the cap from the
three-way valve (4).
2. Connect the charging hose (3) to the three-way valve (4) and N2 gas cylinder (1).
3. Loosen the valve (9) about one turn.
4. Slowly turn the handle of N2 gas cylinder (1) counterclockwise to charge the accumulator with
N2 gas. For gas charging pressure, refer to the table given at under "N2 gas charging
pressure for accumulator".
5. When the gas exceeds the specified value, turn the handle of N2 gas cylinder clockwise,
close the cock and check the pressure.
6. Tighten the valve (9) completely.
7. Loosen the relief valve of the three-way valve (4) and discharge N2 gas in the charging hose.
8. Remove the charging hose (3).
9. Close the cap and relief valve of the three-way valve (4).
10. Repeat operations from 5 onward to check the charge pressure. Make sure that the pressure
is correct. (In the above procedure, the handle of the three-way valve is not used.)
N2 gas charging pressure for accumulator
Ambient temperature [°C]
N2 gas charging pressure
MPa
–25 to –15 5.1 to 5.5
–15 to –5 5.3 to 5.7
–5 to +5 5.5 to 5.9
+5 to +15 5.7 to 6.1
+15 to +25 5.9 to 6.3
+25 to +35 6.1 to 6.5
+35 to +45 6.3 to 6.7
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