75
1.1
This document outlines
procedures for pre-charging the
accumulator, verifying pre-charge
pressure and removal of the
accumulator.
A charging assembly as shown below
is required. The necessary components
are readily available from industrial
suppliers or the assembly is available
for purchase from Rotork Fluid Systems.
Request Rotork part number 90-183
(hose not included).
An inert gas, such as nitrogen, will also
be required for pre-charging.
2.1
Remove the gas valve cap.
2.2
On the charging assembly, turn
the chuck (2) “T” handle fully anti-
clockwise and attach the chuck to the
accumulator.
2.3
Ensure the bleed valve (3) is
tightly closed.
2.4
Attach the Swivel Connector (5)
to the charging assembly gas valve (4)
and tighten to 1-2 Nm / 10-15 in lbs.
2.5
Turn the “T” handle (2) fully
clockwise. This action will open the
valve.
2.6
Open the nitrogen bottle valve
and SLOWLY fill the accumulator. Shut
off the nitrogen supply when the
gauge indicates 110% of the desired
pre-charge level.
2.7
Let the pre-charge sit for 10 to 15
minutes to allow the gas temperature
to stabilize. Slowly open bleed valve (3)
until the desired pressure is reached.
Tightly close bleed valve (3).
2.8
When finished pre-charging, turn
the “T” handle (2) fully anti-clockwise,
then open bleed valve (3) to release
residual gas.
2.9
Use a wrench to prevent the
gas valve assembly from rotating and
remove the charging assembly from the
accumulator.
2.10
Re-install valve cap.
3.1
Use the appropriate valve in the
hydraulic system to discharge oil from
the accumulator.
3.2
Remove the protective cover
and the secondary seal from the
accumulator.
3.3
Turn “T” handle (2) fully anti-
clockwise. Attach the charging
assembly by screwing the gas chuck
to the valve stem of the accumulator.
Tighten to 1-2 Nm / 10-15 in lbs.
3.4
Close bleed valve (3).
3.5
Turn “T” handle (2) clockwise to
release the accumulator pre-charge to
the gauge for pressure verification.
3.6
When finished checking the pre-
charge, turn “T” handle (2) fully anti-
clockwise, then open bleed valve (3).
3.7
Use a wrench to prevent the
gas valve assembly from rotating and
remove the charging assembly from the
accumulator.
3.8
Replace the gas valve cap.
1
5
4
2
3
6
7
Appendix A – Accumulator Pre-charge & Removal
Introduction
1.0
Accumulator
Pre-Charging
2.0
Pre-charge
Verification
3.0
Item
Description
1
Pressure Gauge
2
Gas Chuck/T Handle
3
Bleed Valve
4
Gas Valve
5*
Swivel Connector
6*
Hose
7
Adaptor
* Required only for pre-charging, not
verification or accumulator removal.
