Type of damage:
Cause:
Repair
Internal leakage: Retaining ring
Retaining ring, with divided steel ring
damaged.
Normal degree of wear
Mount new retaining ring, sealings for oil
valve and slotted nut.
Lack of maintenance:
Inflation pressure too low:
Inflation pressure too high:
Consequence:
Consequence:
Note:
High deformation and flexing energy.
Areas of abrasion through bladder folds
Bladder base hammers against oil valve.
Bladder base turns scaly.
Minor gas inclusions in accumulators
that have already been in operation are
insignificant in terms of additional use
Bosch Rexroth AG
Bosch Rexroth AG
RE 50140-R/05.05 Assembly and repair instructions
3
/12
Initial startup
Delivery condition
The accumulator is generally supplied with a 10 bar inflation
pressure.
Preload with nitrogen
To charge the bladder-type accumulator with nitrogen and to check
the accumulator inflation pressure use the BOSCH REXROTH
inflation and testing device, order no. 0 538 103 011.
Bladder-type accumulators must always be inflated to the
specified preload pressure before initial startup. The inflation
pressure must be lower than the calculated pressure, which is
rolled into the housing.
Measures before initial startup and prescribed test
periods
- Check tightness of gas valve (soapy water)
- Tighten sealing cap
- Periodically monitor preload pressure
Use BOSCH REXROTH inflation and testing device to check
inflation pressure at initial startup. Repeat this test during first
week of operation, and thereafter every 6 months under normal
operation or monthly if operation is intensive.
Important:
It is absolutely necessary to use dry nitrogen
(Class 4.0) from a cylinder with a pressure-reducing fitting. The
use of an air compressor of charging with nitrogen is strictly
forbidden.
Installation
To achieve ideal efficiency the hydropneumatic accumulator
should be installed as closely as possible to the consumer. It
is important to have a clearance area of 200 mm, to be able to
install the testing device.
The hydropneumatic accumulator can be installed vertically
(valve upwards) up to a horizontal position. It is important that
the type label is legible at all times, and that access to the
bleeder screw is given.
Connection is done by means of an internal thread or a flange.
It may be fitted with a reduction connection flange or a counter
flange.
Fastening
Note instructions in terms of each accumulator.
Initial startup pressure when pressurized. Bleed lines, to do so
carefully open bleeder screw until fluid escapes and then close
screw.
Courtesy
of
CMA/Flodyne/Hydradyne
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Motion
Control
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