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 info@olaer.ch
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).
- Deate 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,
inate 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).
- Inate 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 ofcial 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.
