14.10.02 io
- Mount the O-ring and the gland ring (Fig. 11).
- Screw the ring nut on. Centralise the parts. With a plastic
hammer, strike the hydraulic valve (Fig. 12) carefully from
all sides while tightening the ring nut by hand.
- Tighten the ring nut fully (Fig. 13).
- Before mounting the reduction on the hydraulic end,
inflate the bladder slowly with nitrogen to a pressure of
1 - 1.5 bar with the tester and pressurizer instrument.
Operate the tester and pressurizer instrument as descri-
bed in OSP 746.
- Check the hydraulic valve seal by manipulating the valve
tappet.
- Mount the venting screw and gasket (Fig. 14).
- Tighten the nameplate and gas inlet valve sub-assembly
nut fully (Fig. 9).
- Inflate the accumulator to the precharge pressure re-
quired by the system.
FIRST OPERATION
Before pressurizing the system, vent via the venting screw.
Retighten the screw carefully as soon as the hydraulic fluid
has left the vessel. Finally, pressurize the hydraulic system
to the maximum, and check the seal of the connections and
gaskets.
No welding/soldering or mechanical operations of any kind
must be undertaken on the accumulator.
Hydropneumatic accumulators are subject to official pres-
sure vessel regulations. These regulations demand that
the accumulator be inspected on a regular basis.
The interval between inspections varies from state to
state. Re-
quest the appertaining intervals for your operation from
the authorities responsible.
CLEANING, INSPECTION AND REPAIRS
- Carefully clean all metallic parts of the accumulator and
dry with compressed air.
- Inspect the vessel for any internal damage.
- By depressing the valve head, check the valve for correct
operation.
- Check that the safety nut on the valve tappet is fully tigh-
tened (secured with Loctite).
- Check that the O-ring shows no sign of wear or any indi-
cation of rubbing.
- Check that the bladder has no sign of major frictional
wear or other damage.
- Under no circumstances attempt to repair the bladder.
- Replace all worn or damaged parts.
ASSEMBLY
- Ensure that no foreign bodies are in the accumulator.
- To facilitate the reassembling of the bladder, smear it and
the vessel interior with the system hydraulic fluid.
- Press the upper part of the bladder together and feed in
through the hydraulic end opening (Fig. 8).
- Lightly screw the nameplate and gas inlet valve sub-as-
sembly nut on (Fig. 9).
- Check that the bladder is neither folded or twisted.
- Put the hydraulic valve into the vessel (Fig. 10).
- Put the divided anti-extrusion ring/ retention ring into the
vessel, and position on the hydraulic valve. Retract the
hydraulic valve so that it sits on the interior of the vessel.
