I. Detection Procedure Using Nitrogen Charging Tools
Safety Preparation Phase
Open the pressure relief valve to release internal pressure from the accumulator.
Remove the protective cover on the accumulator top and the fasteners of the charging valve.
Pressure Detection Operation
Securely connect the nitrogen charging device to the accumulator's gas valve.
Turn the charging tool's regulating valve clockwise and observe the pressure gauge reading.
(Note: The standard pressure range is 7±0.7 MPa. No refill is needed if within this range.)
Refilling Procedure
If pressure is below 6.3 MPa:
Open the nitrogen source valve to replenish pressure.
Immediately close the gas source when pressure reaches 7±0.7 MPa.
Turn the charging tool counterclockwise to fully open it.
Release residual pressure in the pipeline until the gauge returns to zero.
Reinstall all protective components.
Finally, close the pressure relief valve to restore the system to standby status.
II. Detection Method Without Specialized Tools
Pressure Release Operation
Open the pressure relief valve to allow hydraulic oil to return to the tank.
Dynamic Detection Method
Close the pressure relief valve and start the electric oil pump.
Closely observe the pressure gauge's changing characteristics:
Initial rapid pressure rise phase → The transition point where the pressure rise rate significantly slows.
(This transition pressure value represents the current nitrogen pre-charge pressure.)
Precautions:
All operations must be performed with the system fully depressurized.
Pressure accuracy must be strictly controlled during refilling.
The transition point should be determined by analyzing the pressure change rate.
After detection, all safety protection devices must be restored.