OLAER IHV Series Setup guide

OLAER ( Schweiz ) AG
Bonnstrasse 3
CH - 3186 Düdingen
Telephone 026 / 492 70 00
Telefax 026 / 492 70 70
E-Mail [e-mail]
www.olaer.ch
OSP 810
Repair Instructions
Series IHV
23.02.2000 HD
DISMANTLING THE ACCUMULATOR
- Disconnect and close the hydropneumatic accumulator inlet, and discharge the
hydraulic uid from the accumulator.
- Remove the accumulator from its mounting and lay it horizontally in a vice or other
xation system. Take care not to damage the accumulator.
- Where necessary, remove the lead seal from the protective cap(s) of the gas inlet
valve. Unscrew the protective cap(s).
- Deate the bladder using the OLAER tester and pressurizer instrument (Fig. 1).
Operate the tester and pressurizer instrument as described in OSP 746.
- Unscrew the gas inlet valve (Fig. 2).
- Release the gas inlet valve sub-assembly nut, and remove the nameplate (Fig. 3).
- Unscrew the ange or reduction from the hydraulic uid end.
Dismantle the venting screw, without damaging the gasket ring (Fig. 4).
- Release the ring nut and remove gland ring (Fig. 5).
- Carefully push the hydraulic valve inside the vessel casing (Fig. 6).
- Extract the O-ring.
- Separate the divided anti-extrusion ring/ retention ring from the hydraulic valve
sub-assembly, carefully fold together, and remove from the vessel (Fig. 7).
- Remove the hydraulic valve.
- Extract the bladder through the hydraulic end opening (Fig. 8).
MAINTENANCE AND
SERVICE

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,
inate 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).
- Inate 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 uid
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 ofcial 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 uid.
- 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.

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