MTS Series 111 Accumulator - Manual (Page 36)

1. Slowly open the bleed valve on the accumulator charging kit until gas begins to escape. When the pressure
reading on the appropriate pressure gage drops to the level required, close the bleed valve.
2. Close the locknut (or close the chuck valve if you have a core-type valve). Open the bleed valve on the
accumulator charging kit and remove the chuck valve from the accumulator.
3. Install the valve stem cap and protective cover.
6.3.2.0 Increase the Precharge Pressure
See “Check the Accumulator Precharge” to determine if you need to change the precharge pressure.
1. Close the locknut on the accumulator (or close the chuck valve for a coretype valve).
2. Open the bleed valve two turns.
3.
Warning:
Mixing gases can produce unpredictable results.
Do not use another gas to precharge an accumulator.
Use only dry nitrogen gas to precharge accumulators.
Connect the nitrogen supply hose from the supply bottle pressure regulator output to the input check valve
on the charging kit.
4. Open the nitrogen bottle valve. Check the nitrogen bottle pressure gage on the regulator. (The bottle must
contain sufficient pressure to provide an adequate gas volume.)
5. Monitor the regulator output pressure gage and adjust the regulator output pressure valve to the required
level.
6.
Caution:
Rapid flow rates with pressure differentials of more than 2.1 MPa (300 psi) across the
input check valve can damage the valve seal(s).
Avoid rapid and extreme pressure transitions.
Do not allow rapid flow rates. Open the regulator shut-off valve only far enough to permit a
gradual transfer of gas.
Slowly open the regulator shut-off valve until gas is heard escaping from the accumulator charging kit
bleed valve. Allow gas to slowly escape for approximately ten seconds, and then close the bleed valve.
Immediately close the regulator shut-off valve before the pressure reading on either the high or low charging
kit pressure gage exceeds the pressure level of the accumulator.
7. Open the locknut (or open the chuck valve for a core-type valve). Slowly open the regulator shut-off valve
until the pressure indicator on either the high or low charging kit pressure gage begins to rise. When the
pressure is at the required pressure level (recorded on the accumulator), close the regulator shut-off valve.
8. Close the locknut (or close the chuck valve for a core type valve).
9. Open the bleed valve on the accumulator charging kit and remove the chuck valve from the accumulator.
10. Install the valve stem cap and protective cover. Close the valve on the nitrogen bottle.
36 Series 111 Accumulator Product Information
6.0 Maintenance