Operating instruction bladder accumulator BLAK - English
13
7
Disturbance, causes, troubleshooting (qualified staff only)
Disturbance
Cause
Troubleshooting
Pressure equipment will
not supply hydraulic fluid
•
Oil valve closed
•
Gas-side pressure too low
•
Pressure relief open
•
Open oil valve
•
Check pre-inflation pressure
•
Close pressure relief
Hydraulics pressure too
low
•
Shut-off valve closed
•
Pump does not pump
•
Open shut-off valve
•
Check the pump functionality and
repair as necessary
N2 safety valve opens
•
Gas-side pressure too high
•
Operation markedly increases the gas
temperature
•
Fluid overflow
•
Check the pre-inflation pressure and
settings of the plant
•
Find reasons for the temperature
rise
•
Depressurise the pressure
equipment
Gas valve leaking
•
The inflating pressure will drop if the gas valve leaks. Permitted pressure ratio
exceeded. The bladder may potentially be destroyed
•
Gas valve and/or valve cap damaged
•
Replace gas valve and/or valve cap,
use original parts
Oil valve leaking
•
O-ring damaged or hardened due to
excessively high oil temperature
•
Replace O-ring, using original parts,
check oil temperature if necessary
and take appropriate action
Bladder leaking
•
Diagnosing causes – see below
•
Replacing bladder and other
measures – see below
Premature failure (0 -
20 000 load cycles)
•
Foreign inclusions in rubber.
Manufacturing or material defect. Poor
vulcanisation
•
Check gas valve
Bladder is brittle, rigid,
porous and carbonised.
•
Operating ratio greater than 1:4, thus
compression temperature too high; N2
heating up excessively. Oil temperature
too high
•
Calculate new inflation pressure and
set; set oil temperature to
permissible value
Bladder is porous and
swollen
•
Unsuitable fluid, e.g. fire-inhibiting liquids
and buna bladder
•
Check fluid, consult manufacturer
Bladder carbonised on the
gas valve side
•
Inflow speed and operating pressure ratio
too high, due to pressure peaks in system
or too low inflation pressure. Heat
accumulation on gas valve side
inadequately dissipated
•
Reduce inflow speed using flap or
increase inflation pressure
Bladder has abrading
areas
•
Inflation pressure too low. Particularly with
synthetic heavy fluids, the bladder may
rub on, due to greater buoyancy
•
Check inflation pressure. Vertical
installation is recommended from 10
litre and up pressure equipment.
Bladder base has a tear,
hole etc.
•
Faulty oil valve
•
Replace oil valve and bladder
Distinct oil valve imprint on
bladder base.
•
Inflation pressure too high. Bladder base
hammers against fluid valve. Discharge
speed too high.
•
Reset pre-inflation pressure
Bladder is creased
•
30 and 50 litre pressure equipment
assembly fault
-
Valve disc of oil valve
jamming, potentially
damaging the bladder
•
Using fluids leading to sticking / gumming
•
Regular functional test for mobility
of valve disc
